building-codes

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Building Codes

建筑规范

This skill provides practitioner-grade knowledge of building codes for architectural design, focusing on the International Building Code (IBC) as the primary framework with international comparisons. All dimensional values are given in metric with imperial equivalents where standard practice requires.

本技能提供建筑设计领域的执业级建筑规范知识,以IBC(国际建筑规范)为核心框架,并包含国际规范对比。所有尺寸值均以公制单位给出,在行业惯例要求处提供英制等效值。

Section 1: IBC Occupancy Groups

第1节:IBC使用功能分组

The IBC classifies every building or portion of a building into one of 10 occupancy groups based on its use and the characteristics of its occupants. Correct classification is the single most consequential code decision an architect makes -- it drives construction type, height and area limits, egress requirements, fire separation, and plumbing fixture counts.
IBC根据建筑用途及人员特征,将每栋建筑或建筑的一部分划分为10个使用功能分组。正确的分类是建筑师做出的最具决定性的规范决策——它决定了建筑构造类型、高度与面积限制、疏散要求、防火分隔以及卫生器具数量。

Group A -- Assembly

A类——集会类

Buildings where people gather for civic, social, or recreational purposes. The defining characteristic is a concentration of persons who are generally unfamiliar with the building layout, making egress critical.
A-1: Assembly with fixed seating for viewing performances
  • Examples: theaters, concert halls, cinemas, lecture halls with fixed seats
  • Occupant load factor: 0.65 m² net per person (7 ft² net) for fixed seating; count actual seats when installed
  • Typical fire load: moderate (30-60 MJ/m²), but high life-safety risk from concentrated occupancy
  • Key code requirements: panic hardware on exit doors, illuminated exit signs, emergency voice/alarm communication for occupant loads > 300, accessible seating dispersed per ADA/ICC A117.1
A-2: Assembly for food and/or drink consumption
  • Examples: restaurants, bars, nightclubs, banquet halls, cafeterias
  • Occupant load factor: 1.4 m² net per person (15 ft² net) for unconcentrated tables/chairs; 0.65 m² net (7 ft²) for standing/concentrated use
  • Typical fire load: moderate to high (40-80 MJ/m²) due to kitchen equipment
  • Key code requirements: commercial kitchen hood suppression (Type I hood per IMC 507), grease duct fire protection, separation from assembly seating
A-3: Assembly for worship, recreation, or amusement not in A-1/A-2
  • Examples: churches, mosques, synagogues, museums, galleries, libraries (reading rooms), community halls, bowling alleys, courtrooms
  • Occupant load factor: 0.65 m² net per person (7 ft² net) for worship with fixed pews; 1.4 m² net (15 ft²) for unconcentrated use; museums and galleries 2.8 m² net (30 ft²)
  • Typical fire load: variable (20-80 MJ/m²)
  • Key code requirements: museums with irreplaceable collections warrant sprinkler protection regardless of threshold; libraries with stack areas use 9.3 m² gross (100 ft²) per person
A-4: Assembly for viewing indoor sporting events
  • Examples: arenas, skating rinks, indoor swimming pool spectator areas
  • Occupant load factor: 0.65 m² net per person (7 ft² net) for fixed seating; count seats
  • Typical fire load: low to moderate (20-50 MJ/m²)
  • Key code requirements: similar to A-1; crowd management plan for large venues; smoke-protected assembly seating provisions (IBC 1029) allow increased travel distance to 122 m (400 ft) when open-air or smoke-protected
A-5: Assembly for outdoor activities
  • Examples: outdoor stadiums, grandstands, bleachers, amusement park structures
  • Occupant load factor: count seats or 0.65 m² net (7 ft²) for fixed seating
  • Typical fire load: very low
  • Key code requirements: IBC 1029 smoke-protected assembly provisions typically apply; less restrictive construction type requirements due to open-air nature
供人们聚集进行 civic、社交或娱乐活动的建筑。其核心特征是人员密集,且通常对建筑布局不熟悉,因此疏散设计至关重要。
A-1:设有固定座位的观演集会场所
  • 示例:剧院、音乐厅、电影院、带固定座位的报告厅
  • 人员荷载系数:固定座位为0.65平方米/人(7平方英尺/人,净面积);已安装座位时按实际座位数计算
  • 典型火灾荷载:中等(30-60 MJ/m²),但人员密集导致生命安全风险高
  • 核心规范要求:出口门设推闩式逃生门锁、发光疏散指示标志、人员荷载超过300人时设应急语音/报警通信系统、按ADA/ICC A117.1要求分散设置无障碍座位
A-2:供餐饮消费的集会场所
  • 示例:餐厅、酒吧、夜总会、宴会厅、自助餐厅
  • 人员荷载系数:桌椅松散布置时为1.4平方米/人(15平方英尺/人,净面积);站立/密集使用时为0.65平方米/人(7平方英尺/人,净面积)
  • 典型火灾荷载:中到高(40-80 MJ/m²),主要来自厨房设备
  • 核心规范要求:商用厨房排烟罩灭火系统(符合IMC 507的I型排烟罩)、油烟管道防火保护、与集会座位区的分隔要求
A-3:不属于A-1/A-2的礼拜、娱乐或休闲集会场所
  • 示例:教堂、清真寺、犹太会堂、博物馆、画廊、图书馆(阅览室)、社区礼堂、保龄球馆、法庭
  • 人员荷载系数:设固定长椅的礼拜场所为0.65平方米/人(7平方英尺/人,净面积);松散使用场景为1.4平方米/人(15平方英尺/人,净面积);博物馆和画廊为2.8平方米/人(30平方英尺/人,净面积)
  • 典型火灾荷载:可变(20-80 MJ/m²)
  • 核心规范要求:藏有不可替代藏品的博物馆无论面积阈值如何均需设置自动喷水灭火系统;带藏书库的图书馆按9.3平方米/人(100平方英尺/人,建筑面积)计算
A-4:室内体育赛事观演集会场所
  • 示例:体育馆、溜冰场、室内游泳池观众区
  • 人员荷载系数:固定座位为0.65平方米/人(7平方英尺/人,净面积);按座位数计算
  • 典型火灾荷载:低到中等(20-50 MJ/m²)
  • 核心规范要求:与A-1类似;大型场馆需制定人群管理方案;符合防烟集会座位条款(IBC 1029)时,露天或防烟场所的最大疏散距离可增至122米(400英尺)
A-5:户外活动集会场所
  • 示例:露天体育场、大看台、简易看台、游乐园建筑
  • 人员荷载系数:按座位数计算,或固定座位按0.65平方米/人(7平方英尺/人,净面积)
  • 典型火灾荷载:极低
  • 核心规范要求:通常适用IBC 1029防烟集会条款;由于为露天性质,建筑构造类型要求更低

Group B -- Business

B类——办公类

Buildings for office, professional, or service transactions.
  • Examples: offices, banks, outpatient clinics (fewer than 5 care recipients incapable of self-preservation), government buildings, laboratories testing and research (non-hazardous), post offices, radio/TV stations, educational above 12th grade (universities)
  • Occupant load factor: 9.3 m² gross per person (100 ft² gross)
  • Typical fire load: moderate (40-80 MJ/m²), primarily paper and furnishings
  • Key code requirements: less restrictive than assembly; corridor rating may be 0 hr when sprinklered (Table 1020.1); max travel distance 76 m (250 ft) sprinklered, 61 m (200 ft) unsprinklered
用于办公、专业服务或服务交易的建筑。
  • 示例:办公室、银行、门诊诊所(无自救能力的护理对象少于5人)、政府建筑、非危险类测试研究实验室、邮局、广播/电视台、12年级以上教育机构(大学)
  • 人员荷载系数:9.3平方米/人(100平方英尺/人,建筑面积)
  • 典型火灾荷载:中等(40-80 MJ/m²),主要来自纸张和家具
  • 核心规范要求:比集会类要求宽松;设自动喷水灭火系统时走廊耐火等级可为0小时(表1020.1);设喷淋时最大疏散距离76米(250英尺),未设喷淋时61米(200英尺)

Group E -- Educational

E类——教育类

Buildings used for education through the 12th grade by 6 or more students.
  • Examples: schools (K-12), day care for more than 5 children older than 2.5 years
  • Occupant load factor: 1.9 m² net per person (20 ft² net) for classrooms
  • Typical fire load: moderate (30-60 MJ/m²)
  • Key code requirements: storm shelter provisions per ICC 500 in tornado-prone regions; fire alarm with voice/evacuation capability; classroom doors must be lockable from inside (active-shooter provisions, IBC 1010.1.4.4)
用于6名及以上学生的12年级及以下教育活动的建筑。
  • 示例:K-12学校、接收5名以上2.5岁以上儿童的日托机构
  • 人员荷载系数:教室为1.9平方米/人(20平方英尺/人,净面积)
  • 典型火灾荷载:中等(30-60 MJ/m²)
  • 核心规范要求:龙卷风多发地区需符合ICC 500的风暴避难所要求;带语音/疏散功能的火灾报警系统;教室门需可从内部锁闭(主动枪击事件防护条款,IBC 1010.1.4.4)

Group F -- Factory and Industrial

F类——工厂与工业类

Buildings for assembling, fabricating, manufacturing, or processing goods.
F-1: Factory Industrial Moderate-Hazard
  • Examples: aircraft manufacturing, furniture manufacturing, millwork, printing, woodworking
  • Occupant load factor: 11.6 m² gross per person (125 ft² gross)
  • Typical fire load: high (80-200+ MJ/m²)
  • Key code requirements: often requires Type I or II construction for multi-story; sprinklers per IBC 903.2.4 when area exceeds threshold
F-2: Factory Industrial Low-Hazard
  • Examples: beverage bottling, brick manufacturing, ceramic production, foundries, glass products, metal fabrication (noncombustible)
  • Occupant load factor: 11.6 m² gross per person (125 ft² gross)
  • Typical fire load: low to moderate (20-60 MJ/m²)
  • Key code requirements: most permissive industrial classification; noncombustible materials in process reduce fire load
用于产品组装、加工、制造或处理的建筑。
F-1:中危险级工厂工业
  • 示例:飞机制造、家具制造、木制品加工、印刷、木工
  • 人员荷载系数:11.6平方米/人(125平方英尺/人,建筑面积)
  • 典型火灾荷载:高(80-200+ MJ/m²)
  • 核心规范要求:多层建筑通常需采用I类或II类构造;面积超过阈值时需按IBC 903.2.4设置自动喷水灭火系统
F-2:低危险级工厂工业
  • 示例:饮料装瓶、制砖、陶瓷生产、铸造、玻璃制品、不燃类金属加工
  • 人员荷载系数:11.6平方米/人(125平方英尺/人,建筑面积)
  • 典型火灾荷载:低到中等(20-60 MJ/m²)
  • 核心规范要求:限制最少的工业分类;加工过程使用不燃材料,降低了火灾荷载

Group H -- High-Hazard

H类——高危险类

Buildings containing materials that pose a physical or health hazard beyond exempt quantities per IFC Table 307.1(1) and 307.1(2).
H-1: Detonation hazard
  • Materials: explosives, organic peroxides (unclassified detonable)
  • Key code requirements: detached building, minimum setback distances per quantity-distance tables, blast-resistant construction
H-2: Deflagration or accelerated burning hazard
  • Materials: flammable gases, flammable/combustible liquids (Class I-A, I-B, I-C), organic peroxides (Class I), oxidizers (Class 4)
  • Key code requirements: explosion venting, mechanical ventilation, automatic sprinklers, max 1-story for some uses
H-3: Physical hazard materials not in H-1 or H-2
  • Materials: combustible fiber, flammable solids, consumer fireworks (1.4G), oxidizers (Class 1-3)
  • Key code requirements: sprinklers, separation from other occupancies
H-4: Health hazard materials
  • Materials: corrosives, highly toxic materials, toxic materials
  • Key code requirements: continuous ventilation, emergency alarm, spill containment
H-5: Semiconductor fabrication and similar
  • Materials: HPM (hazardous production materials) in semiconductor fabs
  • Key code requirements: HPM storage and handling per IFC Chapter 27, continuous gas monitoring, emergency ventilation
存放的材料所具有的物理或健康危险超过IFC表307.1(1)及307.1(2)规定的豁免数量的建筑。
H-1:爆轰危险
  • 材料:爆炸物、(可爆轰的未分类)有机过氧化物
  • 核心规范要求:独立建筑、按药量-距离对照表确定最小退距、防爆构造
H-2:爆燃或加速燃烧危险
  • 材料:易燃气体、易燃/可燃液体(I-A、I-B、I-C类)、I类有机过氧化物、4类氧化剂
  • 核心规范要求:泄爆设施、机械通风、自动喷水灭火系统、部分用途最多1层
H-3:不属于H-1或H-2的物理危险材料
  • 材料:可燃纤维、易燃固体、民用烟花(1.4G)、1-3类氧化剂
  • 核心规范要求:自动喷水灭火系统、与其他使用功能分隔
H-4:健康危险材料
  • 材料:腐蚀性物质、剧毒物质、有毒物质
  • 核心规范要求:连续通风、应急报警、泄漏围堵设施
H-5:半导体制造及类似用途
  • 材料:半导体工厂中的HPM(危险生产物料)
  • 核心规范要求:HPM的储存和处理符合IFC第27章要求、连续气体监测、应急通风

Group I -- Institutional

I类——机构类

Buildings where occupants are under restraint or incapable of self-preservation.
I-1: Condition 1, supervised residential (more than 16 persons)
  • Examples: assisted living, group homes (> 16), halfway houses, residential board and care
  • Occupant load factor: 18.6 m² gross per person (200 ft² gross)
  • Typical fire load: moderate (40-60 MJ/m²)
  • Key code requirements: NFPA 13 sprinklers required, manual fire alarm, smoke detection in sleeping rooms and corridors
I-2: Medical care / 24-hour supervision (more than 5 persons)
  • Examples: hospitals, nursing homes, psychiatric facilities, detoxification
  • Occupant load factor: 22.3 m² gross per person (240 ft² gross) inpatient
  • Typical fire load: moderate (40-80 MJ/m²)
  • Key code requirements: defend-in-place strategy, smoke compartments max 2090 m² (22,500 ft²), 2-hour fire-rated corridors in some jurisdictions, 1-hour corridor per IBC Table 1020.1, automatic sprinklers required
I-3: Restrained occupancy
  • Examples: prisons, jails, reformatories, detention centers
  • Occupant load factor: 11.1 m² gross per person (120 ft² gross)
  • Conditions 1-5 based on degree of restraint
  • Key code requirements: staff-release smoke detection, remote locking, defend-in-place with smoke compartments
I-4: Day care (more than 5 persons of any age)
  • Examples: adult day care, child care for children under 2.5 years
  • Occupant load factor: 3.3 m² net per person (35 ft² net)
  • Key code requirements: if above or below level of exit discharge, classified as I-4; otherwise may be E or I-4 depending on occupants
居住者受到约束或无自救能力的建筑。
I-1:条件1,受监护居住(超过16人)
  • 示例:辅助生活设施、集体照料住宅(>16人)、中途宿舍、寄宿照料住宅
  • 人员荷载系数:18.6平方米/人(200平方英尺/人,建筑面积)
  • 典型火灾荷载:中等(40-60 MJ/m²)
  • 核心规范要求:需设置NFPA 13自动喷水灭火系统、手动火灾报警系统、卧室及走廊设烟雾探测
I-2:医疗护理/24小时监护(超过5人)
  • 示例:医院、疗养院、精神科机构、戒毒中心
  • 人员荷载系数:住院部为22.3平方米/人(240平方英尺/人,建筑面积)
  • 典型火灾荷载:中等(40-80 MJ/m²)
  • 核心规范要求:原地防护策略、防烟单元最大面积2090平方米(22500平方英尺)、部分司法管辖区要求走廊耐火等级2小时、IBC表1020.1规定走廊耐火等级1小时、需设置自动喷水灭火系统
I-3:受约束居住
  • 示例:监狱、看守所、教养所、拘留中心
  • 人员荷载系数:11.1平方米/人(120平方英尺/人,建筑面积)
  • 按约束程度分为1-5种条件
  • 核心规范要求:工作人员复位式烟雾探测、远程锁闭、带防烟单元的原地防护设计
I-4:日托(超过5名任意年龄人员)
  • 示例:成人日托、2.5岁以下儿童日托
  • 人员荷载系数:3.3平方米/人(35平方英尺/人,净面积)
  • 核心规范要求:若位于疏散出口层以上或以下,归类为I-4;否则根据居住者情况可归为E类或I-4类

Group M -- Mercantile

M类——商业类

Buildings for display and sale of merchandise.
  • Examples: department stores, retail shops, drug stores, markets, gas stations, motor fuel-dispensing facilities
  • Occupant load factor: 2.8 m² gross per person (30 ft² gross) for ground floor and basement; 5.6 m² gross (60 ft²) for upper floors
  • Typical fire load: moderate to high (50-150 MJ/m²) depending on stock
  • Key code requirements: sprinklers when fire area > 1115 m² (12,000 ft²); high-piled combustible storage (IFC Chapter 32) when stock > 3.7 m (12 ft)
用于商品展示和销售的建筑。
  • 示例:百货商店、零售店、药店、市场、加油站、机动车加油设施
  • 人员荷载系数:首层及地下室为2.8平方米/人(30平方英尺/人,建筑面积);高层为5.6平方米/人(60平方英尺/人,建筑面积)
  • 典型火灾荷载:中到高(50-150 MJ/m²),取决于库存情况
  • 核心规范要求:防火分区面积超过1115平方米(12000平方英尺)时需设自动喷水灭火系统;库存高度超过3.7米(12英尺)时需符合高堆垛可燃储存要求(IFC第32章)

Group R -- Residential

R类——居住类

Buildings providing sleeping accommodations (not I group).
R-1: Transient (stays < 30 days)
  • Examples: hotels, motels, boarding houses (transient)
  • Occupant load factor: 18.6 m² gross per person (200 ft² gross)
  • Typical fire load: moderate (30-60 MJ/m²)
  • Key code requirements: automatic sprinklers (NFPA 13), single-station smoke alarms in each sleeping room + corridor, manual fire alarm
R-2: Permanent (stays >= 30 days, more than 2 dwelling units)
  • Examples: apartment buildings, condominiums, dormitories, monasteries
  • Occupant load factor: 18.6 m² gross per person (200 ft² gross)
  • Typical fire load: moderate (40-80 MJ/m²)
  • Key code requirements: NFPA 13 or 13R sprinklers (13R permitted for buildings up to 4 stories per NFPA 13R scope), interconnected smoke alarms in each unit, fire alarm when > 16 units
R-3: One- and two-family dwellings and townhouses
  • Examples: single-family houses, duplexes, townhouses (max 3 stories), adult/child care for <= 5 persons, congregate living <= 16
  • Occupant load factor: 18.6 m² gross per person (200 ft² gross)
  • Typical fire load: moderate (40-80 MJ/m²)
  • Key code requirements: IRC (International Residential Code) may be used instead of IBC; NFPA 13D residential sprinklers in many jurisdictions
R-4: Residential care/assisted living (5-16 persons)
  • Examples: small group homes, small assisted living, alcohol/drug recovery
  • Occupant load factor: 18.6 m² gross per person (200 ft² gross)
  • Key code requirements: Condition 1 (ambulatory) or Condition 2 (non-ambulatory); Condition 2 requires conformance with I-1 or I-2 provisions
提供住宿的建筑(不属于I类)。
R-1:短期居住(停留<30天)
  • 示例:酒店、汽车旅馆、短期寄宿公寓
  • 人员荷载系数:18.6平方米/人(200平方英尺/人,建筑面积)
  • 典型火灾荷载:中等(30-60 MJ/m²)
  • 核心规范要求:NFPA 13自动喷水灭火系统、每间卧室及走廊设独立式烟雾报警器、手动火灾报警系统
R-2:长期居住(停留≥30天,居住单元超过2个)
  • 示例:公寓楼、共管公寓、宿舍、修道院
  • 人员荷载系数:18.6平方米/人(200平方英尺/人,建筑面积)
  • 典型火灾荷载:中等(40-80 MJ/m²)
  • 核心规范要求:NFPA 13或13R自动喷水灭火系统(根据NFPA 13R适用范围,4层及以下建筑可采用13R)、每户设联动式烟雾报警器、超过16个单元时设火灾报警系统
R-3:独户、双户住宅及联排住宅
  • 示例:独户住宅、双拼住宅、联排住宅(最多3层)、接收≤5人的成人/儿童日托、≤16人的集体居住设施
  • 人员荷载系数:18.6平方米/人(200平方英尺/人,建筑面积)
  • 典型火灾荷载:中等(40-80 MJ/m²)
  • 核心规范要求:可采用IRC(国际住宅规范)替代IBC;许多司法管辖区要求设置NFPA 13D住宅自动喷水灭火系统
R-4:居住照料/辅助生活(5-16人)
  • 示例:小型集体住宅、小型辅助生活设施、酒精/毒品康复中心
  • 人员荷载系数:18.6平方米/人(200平方英尺/人,建筑面积)
  • 核心规范要求:条件1(可自行行走)或条件2(无法自行行走);条件2需符合I-1或I-2类的规定

Group S -- Storage

S类——储存类

Buildings for storage not classified as hazardous.
S-1: Storage Moderate-Hazard
  • Examples: furniture storage, tire storage, mattress storage, motor vehicle repair garages, aircraft hangars (repair/storage)
  • Occupant load factor: 27.9 m² gross per person (300 ft² gross)
  • Typical fire load: high (80-200+ MJ/m²)
  • Key code requirements: sprinklers when fire area > 1115 m² (12,000 ft²); repair garages require mechanical ventilation per IMC
S-2: Storage Low-Hazard
  • Examples: parking garages, aircraft hangars (storage only), noncombustible material storage (metal, stone, glass)
  • Occupant load factor: 27.9 m² gross per person (300 ft² gross)
  • Typical fire load: low to moderate (10-40 MJ/m²)
  • Key code requirements: open parking garages (IBC 406.5) get significant height/area increases; enclosed garages require CO detection
用于非危险类储存的建筑。
S-1:中危险级储存
  • 示例:家具储存、轮胎储存、床垫储存、机动车维修车库、飞机库(维修/储存)
  • 人员荷载系数:27.9平方米/人(300平方英尺/人,建筑面积)
  • 典型火灾荷载:高(80-200+ MJ/m²)
  • 核心规范要求:防火分区面积超过1115平方米(12000平方英尺)时需设自动喷水灭火系统;维修车库需按IMC要求设机械通风
S-2:低危险级储存
  • 示例:停车库、飞机库(仅储存)、不燃材料储存(金属、石材、玻璃)
  • 人员荷载系数:27.9平方米/人(300平方英尺/人,建筑面积)
  • 典型火灾荷载:低到中等(10-40 MJ/m²)
  • 核心规范要求:敞开式停车库(IBC 406.5)的高度/面积可大幅增加;封闭式车库需设一氧化碳探测

Group U -- Utility and Miscellaneous

U类——公用及杂项类

Buildings not classified in any other group.
  • Examples: agricultural buildings, carports, fences > 1.8 m (6 ft), retaining walls, tanks, towers, barns, greenhouses, sheds
  • Occupant load factor: 27.9 m² gross per person (300 ft² gross)
  • Typical fire load: variable
  • Key code requirements: agricultural buildings exempt from many IBC provisions per IBC 312; private garages classified U if not S-2

不属于任何其他类别的建筑。
  • 示例:农业建筑、车棚、高度超过1.8米(6英尺)的围栏、挡土墙、储罐、塔架、谷仓、温室、棚屋
  • 人员荷载系数:27.9平方米/人(300平方英尺/人,建筑面积)
  • 典型火灾荷载:可变
  • 核心规范要求:根据IBC 312,农业建筑可豁免多项IBC规定;私人车库若不属于S-2类则归为U类

Section 2: Construction Types

第2节:建筑构造类型

The IBC defines 5 construction types (I through V) with two subcategories each (A and B), for a total of 10 classifications. Additionally, the 2021 IBC introduced Type IV subcategories for mass timber. Construction type determines fire resistance ratings for structural elements and, combined with occupancy, sets height and area limits.
IBC定义了5种建筑构造类型(I至V类),每种又分为A、B两个子类,共10种分类。此外,2021版IBC新增了重型木结构的IV类子类。建筑构造类型决定了结构构件的耐火等级,并与使用功能共同确定建筑的高度和面积限制。

Type I -- Noncombustible

I类——不燃型

The most fire-resistive construction. All structural elements are noncombustible.
Type IA
  • Structural frame: 3-hour fire resistance rating (FRR)
  • Bearing walls (exterior): 3-hour FRR
  • Bearing walls (interior): 3-hour FRR
  • Floor construction: 2-hour FRR
  • Roof construction: 1.5-hour FRR
  • Typical materials: reinforced concrete, protected steel
  • Applications: high-rise buildings, hospitals, large assembly
Type IB
  • Structural frame: 2-hour FRR
  • Bearing walls (exterior): 2-hour FRR
  • Bearing walls (interior): 2-hour FRR
  • Floor construction: 2-hour FRR
  • Roof construction: 1-hour FRR
  • Typical materials: reinforced concrete, protected steel
  • Applications: mid-rise to high-rise office, residential, institutional
耐火性能最高的构造类型,所有结构构件均为不燃材料。
IA型
  • 结构框架:3小时耐火等级(FRR)
  • 承重墙(外墙):3小时耐火等级
  • 承重墙(内墙):3小时耐火等级
  • 楼盖构造:2小时耐火等级
  • 屋盖构造:1.5小时耐火等级
  • 典型材料:钢筋混凝土、带防火保护的钢结构
  • 应用场景:高层建筑、医院、大型集会建筑
IB型
  • 结构框架:2小时耐火等级
  • 承重墙(外墙):2小时耐火等级
  • 承重墙(内墙):2小时耐火等级
  • 楼盖构造:2小时耐火等级
  • 屋盖构造:1小时耐火等级
  • 典型材料:钢筋混凝土、带防火保护的钢结构
  • 应用场景:中高层到高层办公、居住、机构建筑

Type II -- Noncombustible (reduced ratings)

II类——不燃型(耐火等级较低)

Structural elements are noncombustible but with lower or no fire resistance ratings.
Type IIA
  • Structural frame: 1-hour FRR
  • Bearing walls (exterior): 1-hour FRR
  • Bearing walls (interior): 1-hour FRR
  • Floor construction: 1-hour FRR
  • Roof construction: 1-hour FRR
  • Typical materials: protected steel, light-gauge steel framing with gypsum
  • Applications: mid-rise office, retail, educational
Type IIB
  • Structural frame: 0-hour FRR (noncombustible, unprotected)
  • Bearing walls (exterior): 0-hour FRR
  • Bearing walls (interior): 0-hour FRR
  • Floor construction: 0-hour FRR
  • Roof construction: 0-hour FRR
  • Typical materials: unprotected steel, metal deck
  • Applications: warehouses, single-story commercial, big-box retail
结构构件为不燃材料,但耐火等级较低或无耐火要求。
IIA型
  • 结构框架:1小时耐火等级
  • 承重墙(外墙):1小时耐火等级
  • 承重墙(内墙):1小时耐火等级
  • 楼盖构造:1小时耐火等级
  • 屋盖构造:1小时耐火等级
  • 典型材料:带防火保护的钢结构、配石膏板的轻钢龙骨
  • 应用场景:中层办公、商业、教育建筑
IIB型
  • 结构框架:0小时耐火等级(不燃,无保护)
  • 承重墙(外墙):0小时耐火等级
  • 承重墙(内墙):0小时耐火等级
  • 楼盖构造:0小时耐火等级
  • 屋盖构造:0小时耐火等级
  • 典型材料:无保护钢结构、压型钢板
  • 应用场景:仓库、单层商业建筑、大型仓储式零售店

Type III -- Exterior Noncombustible, Interior Any

III类——外墙不燃、内墙不限

Exterior walls are noncombustible; interior structure may be combustible.
Type IIIA
  • Structural frame: 1-hour FRR
  • Bearing walls (exterior): 2-hour FRR (noncombustible)
  • Bearing walls (interior): 1-hour FRR
  • Floor construction: 1-hour FRR
  • Roof construction: 1-hour FRR
  • Typical materials: masonry/concrete exterior, wood-frame interior with gypsum protection
  • Applications: 3-5 story residential (apartments, hotels), mixed-use podium
Type IIIB
  • Structural frame: 0-hour FRR
  • Bearing walls (exterior): 2-hour FRR (noncombustible)
  • Bearing walls (interior): 0-hour FRR
  • Floor construction: 0-hour FRR
  • Roof construction: 0-hour FRR
  • Typical materials: masonry exterior, unprotected wood interior
  • Applications: low-rise mixed-use, retail with residential above
外墙为不燃材料,内部结构可采用可燃材料。
IIIA型
  • 结构框架:1小时耐火等级
  • 承重墙(外墙):2小时耐火等级(不燃)
  • 承重墙(内墙):1小时耐火等级
  • 楼盖构造:1小时耐火等级
  • 屋盖构造:1小时耐火等级
  • 典型材料:砌体/混凝土外墙、带石膏板防护的木框架内墙
  • 应用场景:3-5层居住建筑(公寓、酒店)、混合用途裙房
IIIB型
  • 结构框架:0小时耐火等级
  • 承重墙(外墙):2小时耐火等级(不燃)
  • 承重墙(内墙):0小时耐火等级
  • 楼盖构造:0小时耐火等级
  • 屋盖构造:0小时耐火等级
  • 典型材料:砌体外墙、无保护木框架内墙
  • 应用场景:低层混合用途建筑、底层商业上层居住建筑

Type IV -- Heavy Timber and Mass Timber

IV类——重木与重型木结构

Type IV (Legacy Heavy Timber, now Type IV-HT)
  • Structural frame: heavy timber (HT) -- min dimensions per IBC 602.4 (columns min 203 mm / 8 in, beams min 152 x 203 mm / 6 x 8 in)
  • Bearing walls (exterior): 2-hour FRR (noncombustible)
  • Floor construction: heavy timber (min 76 mm / 3 in thick)
  • Roof construction: heavy timber (min 51 mm / 2 in thick)
  • No concealed spaces permitted
Type IV-A (Mass Timber, highest protection)
  • Structural frame: 3-hour FRR (mass timber fully encapsulated with noncombustible protection)
  • Floor/roof: 2-hour FRR (encapsulated)
  • All mass timber surfaces covered by noncombustible protection (typically 2 layers of 16 mm Type X gypsum board)
  • Maximum 18 stories per IBC (2021+)
Type IV-B (Mass Timber, partial exposure)
  • Structural frame: 2-hour FRR
  • Floor/roof: 2-hour FRR
  • Limited exposed mass timber permitted: up to 20% of ceiling area, 40% of walls (noncombustible protection on remainder)
  • Maximum 12 stories per IBC (2021+)
Type IV-C (Mass Timber, exposed)
  • Structural frame: 2-hour FRR
  • Floor/roof: 2-hour FRR
  • Mass timber may be fully exposed (no required noncombustible covering)
  • Maximum 9 stories per IBC (2021+)
  • Fire resistance achieved by oversizing timber members beyond structural requirements to account for charring
IV类(传统重木结构,现称IV-HT型)
  • 结构框架:重木(HT)——最小尺寸符合IBC 602.4要求(柱最小203毫米/8英寸,梁最小152×203毫米/6×8英寸)
  • 承重墙(外墙):2小时耐火等级(不燃)
  • 楼盖构造:重木(最小厚度76毫米/3英寸)
  • 屋盖构造:重木(最小厚度51毫米/2英寸)
  • 不允许设置隐蔽空间
IV-A型(重型木结构,最高防护等级)
  • 结构框架:3小时耐火等级(重型木结构完全包覆不燃防护层)
  • 楼盖/屋盖:2小时耐火等级(包覆防护层)
  • 所有重型木结构表面均覆盖不燃防护层(通常为两层16毫米厚X型石膏板)
  • 按2021及以后版本IBC,最多可建18层
IV-B型(重型木结构,部分外露)
  • 结构框架:2小时耐火等级
  • 楼盖/屋盖:2小时耐火等级
  • 允许有限外露重型木结构:最多占天花板面积的20%、墙面面积的40%(其余部分设不燃防护层)
  • 按2021及以后版本IBC,最多可建12层
IV-C型(重型木结构,全外露)
  • 结构框架:2小时耐火等级
  • 楼盖/屋盖:2小时耐火等级
  • 重型木结构可完全外露(无需设置不燃覆盖层)
  • 按2021及以后版本IBC,最多可建9层
  • 耐火性能通过将木材构件尺寸加大至超出结构要求,以预留炭化层厚度实现

Type V -- Combustible

V类——可燃型

Wood-frame or other combustible construction.
Type VA
  • Structural frame: 1-hour FRR
  • Bearing walls (exterior): 1-hour FRR
  • Bearing walls (interior): 1-hour FRR
  • Floor construction: 1-hour FRR
  • Roof construction: 1-hour FRR
  • Typical materials: wood-frame with gypsum board enclosure
  • Applications: 3-5 story residential (with podium), townhouses, small commercial
Type VB
  • Structural frame: 0-hour FRR
  • Bearing walls (exterior): 0-hour FRR
  • Bearing walls (interior): 0-hour FRR
  • Floor construction: 0-hour FRR
  • Roof construction: 0-hour FRR
  • Typical materials: unprotected wood-frame
  • Applications: 1-2 story houses, small commercial, agricultural
木框架或其他可燃构造。
VA型
  • 结构框架:1小时耐火等级
  • 承重墙(外墙):1小时耐火等级
  • 承重墙(内墙):1小时耐火等级
  • 楼盖构造:1小时耐火等级
  • 屋盖构造:1小时耐火等级
  • 典型材料:带石膏板围护的木框架
  • 应用场景:3-5层居住建筑(带裙房)、联排住宅、小型商业建筑
VB型
  • 结构框架:0小时耐火等级
  • 承重墙(外墙):0小时耐火等级
  • 承重墙(内墙):0小时耐火等级
  • 楼盖构造:0小时耐火等级
  • 屋盖构造:0小时耐火等级
  • 典型材料:无保护木框架
  • 应用场景:1-2层住宅、小型商业建筑、农业建筑

Height and Area by Construction Type (IBC Table 504.3/504.4 Summary)

不同构造类型的建筑高度与面积(IBC表504.3/504.4摘要)

Selected maximum heights (stories / feet) and areas (ft² per floor) for sprinklered buildings:
OccupancyType IAType IBType IIAType IIBType IIIAType VAType VB
A-2UL/UL12/18012/8512/7512/854/702/40
BUL/UL12/18012/8512/7512/854/702/40
R-2UL/UL12/18012/8512/7512/854/703/50
S-1UL/UL12/1806/794/485/484/392/26
(UL = Unlimited. All areas shown in thousands of ft². Height in stories/feet. Values are with sprinkler increase per IBC 504.2. Actual project values must be verified against IBC Table 504.3, 504.4, and 506.2.)

设自动喷水灭火系统建筑的部分最大高度(层数/英尺)及面积(千平方英尺/层):
使用功能Type IAType IBType IIAType IIBType IIIAType VAType VB
A-2UL/UL12/18012/8512/7512/854/702/40
BUL/UL12/18012/8512/7512/854/702/40
R-2UL/UL12/18012/8512/7512/854/703/50
S-1UL/UL12/1806/794/485/484/392/26
(UL = 无限制。所有面积单位为千平方英尺。高度单位为层数/英尺。数值已包含IBC 504.2规定的自动喷水灭火系统增益。实际项目数值需对照IBC表504.3、504.4及506.2核实。)

Section 3: Height and Area Limitations

第3节:高度与面积限制

Calculating Allowable Height

允许高度计算

IBC controls height two ways:
  1. Allowable stories above grade plane (IBC Table 504.4)
  2. Allowable building height in feet/meters (IBC Table 504.3)
Both must be satisfied. The more restrictive governs.
Sprinkler height increase (IBC 504.2):
  • An NFPA 13 sprinkler system adds 6.1 m (20 ft) to allowable height
  • Adds 1 story to allowable stories (except for certain H and I occupancies)
  • Type IB and higher with Group B, M, or S-2: unlimited height when sprinklered
IBC从两个维度控制建筑高度:
  1. 室外地面以上允许层数(IBC表504.4)
  2. 建筑允许高度(英尺/米)(IBC表504.3)
两个维度均需满足,以更严格者为准。
自动喷水灭火系统高度增益(IBC 504.2):
  • 设置NFPA 13自动喷水灭火系统可增加6.1米(20英尺)允许高度
  • 允许层数增加1层(部分H类和I类使用功能除外)
  • IB类及更高等级构造的B、M或S-2类建筑:设自动喷水灭火系统时高度无限制

Calculating Allowable Area

允许面积计算

Base allowable area per floor is given by IBC Table 506.2 based on occupancy and construction type.
Frontage increase (If):
If = [F/P - 0.25] × 100 / 0.75
Where:
  • F = building perimeter fronting on public way or open space > 6.1 m (20 ft) wide
  • P = total building perimeter
  • Maximum If = 75%
  • Minimum F/P = 0.25 (no increase below this)
Sprinkler increase (Is):
  • Multi-story: Is = 200% (area triples) for NFPA 13 system
  • Single-story: Is = 300% (area quadruples) for NFPA 13 system
Allowable area per floor (Aa):
Aa = At + [At × If / 100] + [At × Is / 100]
Where At = tabular area from Table 506.2
Allowable total building area:
Total = Aa × number of stories (up to 3 stories)
For buildings > 3 stories, total area is not limited per floor but overall building footprint is governed by Aa.
每层基准允许面积由IBC表506.2根据使用功能和建筑构造类型确定。
临街面增益(If):
If = [F/P - 0.25] × 100 / 0.75
其中:
  • F = 临公共道路或宽度大于6.1米(20英尺)开放空间的建筑周长
  • P = 建筑总周长
  • 最大If = 75%
  • 最小F/P = 0.25(低于该值无增益)
自动喷水灭火系统增益(Is):
  • 多层建筑:设NFPA 13系统时Is = 200%(面积增至3倍)
  • 单层建筑:设NFPA 13系统时Is = 300%(面积增至4倍)
每层允许面积(Aa):
Aa = At + [At × If / 100] + [At × Is / 100]
其中At = 表506.2中的表格面积
建筑总允许面积:
Total = Aa × number of stories (up to 3 stories)
对于超过3层的建筑,每层面积无总限制,但建筑整体基底面积需符合Aa要求。

Unlimited Area Buildings (IBC 507)

无面积限制建筑(IBC 507)

A building may have unlimited area when ALL of the following are met:
  1. Single story (one story above grade plane)
  2. NFPA 13 sprinkler system throughout
  3. Construction type and occupancy per the following:
    • Type I or IIA: Groups A, B, E, F, H (limited), M, S
    • Type IIIA or IV: Groups B, F, M, S (with 18.3 m / 60 ft setback all sides)
    • Type IIA: Group A-4 (open air) without sprinkler requirement
  4. Perimeter access: 18.3 m (60 ft) minimum setback from lot lines on all sides, or public way frontage for fire department access
These provisions enable large-footprint buildings: convention centers, big-box retail, warehouses, aircraft hangars, manufacturing plants.

满足以下全部条件的建筑可不受面积限制:
  1. 单层建筑(室外地面以上仅1层)
  2. 全域设置NFPA 13自动喷水灭火系统
  3. 建筑构造类型与使用功能符合以下要求:
    • I类或IIA型:A、B、E、F、H(受限)、M、S类
    • IIIA类或IV类:B、F、M、S类(四周退距均为18.3米/60英尺)
    • IIA型:A-4类(露天),无需设置自动喷水灭火系统
  4. 周边通行条件:所有侧边距用地红线至少18.3米(60英尺)退距,或临公共道路可供消防部门通行
这些条款适用于大基底面积建筑:会议中心、大型仓储式零售店、仓库、飞机库、制造工厂。

Section 4: Means of Egress

第4节:疏散通道系统

Means of egress is the continuous and unobstructed path of travel from any occupied point in a building to a public way. It consists of three components.
疏散通道系统是指从建筑内任意使用点到公共道路的连续、无阻碍通行路径,由三部分组成。

Three Components

三部分组成

  1. Exit Access -- the path from any occupied point to an exit. Includes rooms, corridors, aisles, ramps, and unenclosed stairs within exit access. Not fire-rated (except corridor requirements per Table 1020.1).
  2. Exit -- the fire-rated portion separating exit access from exit discharge. Includes:
    • Interior exit stairways (enclosed stairs)
    • Interior exit ramps
    • Exit passageways (horizontal fire-rated corridors connecting stairs to exit discharge)
    • Horizontal exits (fire wall with fire doors allowing passage to adjacent fire compartment)
  3. Exit Discharge -- the path from the exit to the public way. Includes exterior exit doors, vestibules, exit courts, exterior stairs. Max 50% of exits may discharge through the level of exit discharge (ground floor) if sprinklered and path through ground floor is protected.
  1. 疏散走道(Exit Access)——从任意使用点到安全出口的路径。包括房间、走廊、过道、坡道,以及疏散走道范围内的敞开楼梯。无耐火等级要求(表1020.1规定的走廊要求除外)。
  2. 安全出口(Exit)——分隔疏散走道与出口疏散段的耐火部分,包括:
    • 室内疏散楼梯(封闭楼梯间)
    • 室内疏散坡道
    • 疏散通廊(连接楼梯与出口疏散段的水平耐火走廊)
    • 水平疏散出口(带防火门的防火墙,可通往相邻防火分区)
  3. 出口疏散段(Exit Discharge)——从安全出口到公共道路的路径,包括室外疏散门、门斗、疏散庭院、室外楼梯。若建筑设自动喷水灭火系统且首层路径有防护,最多50%的安全出口可通过疏散出口层(首层)疏散。

Number of Exits Required (IBC Table 1006.2.1)

所需安全出口数量(IBC表1006.2.1)

Occupant LoadMinimum Exits
1-5002
501-1,0003
> 1,0004
Exception for single exit: Certain occupancies with small occupant loads and short travel distances may have a single exit per IBC Table 1006.2.1:
  • Group B: max 49 occupants, max travel distance 23 m (75 ft), max 1 story
  • Group R-2: max 4 dwelling units per floor, max travel distance 38 m (125 ft) sprinklered
人员荷载最少出口数
1-5002
501-1,0003
> 1,0004
单出口例外情况: 根据IBC表1006.2.1,部分人员荷载小、疏散距离短的使用功能可仅设1个出口:
  • B类:最多49人,最大疏散距离23米(75英尺),最多1层
  • R-2类:每层最多4个居住单元,设自动喷水灭火系统时最大疏散距离38米(125英尺)

Travel Distance (IBC Table 1017.2)

疏散距离(IBC表1017.2)

Maximum travel distance from the most remote point to the nearest exit:
OccupancyUnsprinkleredSprinklered
A61 m (200 ft)76 m (250 ft)
B61 m (200 ft)91 m (300 ft)
E61 m (200 ft)76 m (250 ft)
F-161 m (200 ft)76 m (250 ft)
H-123 m (75 ft)23 m (75 ft)
H-223 m (75 ft)30 m (100 ft)
H-3NP30 m (100 ft)
I-161 m (200 ft)76 m (250 ft)
I-2NP61 m (200 ft)
M61 m (200 ft)76 m (250 ft)
R61 m (200 ft)76 m (250 ft)
S-161 m (200 ft)76 m (250 ft)
S-291 m (300 ft)122 m (400 ft)
U61 m (200 ft)76 m (250 ft)
(NP = not permitted without sprinklers)
从最远点到最近安全出口的最大疏散距离:
使用功能未设自动喷水灭火系统设自动喷水灭火系统
A61米(200英尺)76米(250英尺)
B61米(200英尺)91米(300英尺)
E61米(200英尺)76米(250英尺)
F-161米(200英尺)76米(250英尺)
H-123米(75英尺)23米(75英尺)
H-223米(75英尺)30米(100英尺)
H-3NP30米(100英尺)
I-161米(200英尺)76米(250英尺)
I-2NP61米(200英尺)
M61米(200英尺)76米(250英尺)
R61米(200英尺)76米(250英尺)
S-161米(200英尺)76米(250英尺)
S-291米(300英尺)122米(400英尺)
U61米(200英尺)76米(250英尺)
(NP = 不允许未设自动喷水灭火系统)

Common Path of Egress Travel

公共疏散路径长度

The portion of exit access that must be traversed before two separate paths to two exits become available:
  • General: 23 m (75 ft)
  • Groups B, F, S (sprinklered): 30 m (100 ft)
  • Group R (sprinklered): 38 m (125 ft)
  • Groups I-1, I-2: 15 m (50 ft)
疏散走道中,在到达两个通往不同出口的独立路径分叉点之前必须通行的部分:
  • 一般情况:23米(75英尺)
  • B、F、S类(设自动喷水灭火系统):30米(100英尺)
  • R类(设自动喷水灭火系统):38米(125英尺)
  • I-1、I-2类:15米(50英尺)

Dead-End Corridors

袋形走道

  • General: 6.1 m (20 ft) maximum dead-end corridor
  • Sprinklered B, F-1, S-1: 15 m (50 ft)
  • Groups I-2, I-3: 6.1 m (20 ft), no increase
  • 一般情况:袋形走道最大长度6.1米(20英尺)
  • 设自动喷水灭火系统的B、F-1、S-1类:15米(50英尺)
  • I-2、I-3类:6.1米(20英尺),无增益

Exit Width Calculation

出口宽度计算

Stairways:
  • 7.6 mm (0.3 in) per occupant served
  • Minimum stair width: 1118 mm (44 in) for occupant load >= 50; 914 mm (36 in) for < 50
Level components (doors, corridors, ramps):
  • 5.1 mm (0.2 in) per occupant served
  • Minimum corridor width: 1118 mm (44 in) general; 1829 mm (72 in) for I-2 corridors; 2438 mm (96 in) for E corridors
Example: 600 occupants, 2 stairs:
  • Each stair serves 300 occupants (at minimum; balanced loading)
  • Stair width = 300 × 7.6 mm = 2,280 mm required
  • Provide 2,300 mm (or two 1,150 mm stairs is insufficient -- each must be 2,280 mm? No -- total capacity across all exits must accommodate total occupant load, with largest single exit excluded)
  • IBC 1005.1: with any one exit blocked, remaining exits must handle total load. With 2 exits, each must handle 100% of load
  • Revised: each stair = 600 × 7.6 mm = 4,560 mm? No -- each stair handles 50%, but IBC requires total minus largest single exit
  • Correct application: 2 exits, each 50% = 300 occupants per stair = 300 × 7.6 = 2,280 mm per stair
(Note: The convergence factor and actual calculation method should be verified against the specific IBC edition adopted by the jurisdiction.)
楼梯:
  • 每服务1人需7.6毫米(0.3英寸)宽度
  • 最小楼梯宽度:人员荷载≥50人时为1118毫米(44英寸);<50人时为914毫米(36英寸)
水平构件(门、走廊、坡道):
  • 每服务1人需5.1毫米(0.2英寸)宽度
  • 最小走廊宽度:一般情况1118毫米(44英寸);I-2类走廊1829毫米(72英寸);E类走廊2438毫米(96英寸)
示例: 600人,2部楼梯:
  • 每部楼梯至少服务300人(荷载均衡)
  • 楼梯宽度 = 300 × 7.6 毫米 = 需2280毫米
  • 设2300毫米宽(或者两部1150毫米宽的楼梯不够——每部都必须是2280毫米?不对——所有出口的总通行能力需容纳总人员荷载,且需扣除最大的一个出口的容量)
  • IBC 1005.1:若任意一个出口被封堵,剩余出口需承载全部荷载。有2个出口时,每个出口需承载100%的荷载
  • 修正:每部楼梯 = 600 × 7.6 毫米 = 4560毫米?不对——每部楼梯承担50%,但IBC要求总容量减去最大单个出口的容量后仍需满足要求
  • 正确应用:2个出口,每个承担50% = 每部楼梯300人 = 300 × 7.6 = 每部楼梯2280毫米
(注:收敛系数及实际计算方法需对照管辖机构采用的具体IBC版本核实。)

European Comparison (EN/BS)

欧洲规范对比(EN/BS)

  • EN standard stair width: 1,100 mm minimum (BS 9999: 1,050 mm minimum for up to 150 persons per floor)
  • Travel distance measured differently: actual walking distance along shortest route vs. IBC straight-line method

  • EN标准楼梯最小宽度:1100毫米(BS 9999:每层最多150人时最小宽度为1050毫米)
  • 疏散距离计算方式不同:欧洲规范为沿最短路径的实际步行距离,而IBC采用直线距离法

Section 5: Fire Separation Requirements

第5节:防火分隔要求

Types of Fire-Rated Construction

耐火构造类型

Fire Wall (IBC 706):
  • Structural independence (self-supporting, remains standing if structure on either side collapses)
  • Creates separate buildings for height/area calculations
  • Rating: 2 hr (R, B, E, M) to 4 hr (H, F-1, S-1)
Fire Barrier (IBC 707):
  • Continuous from floor to underside of floor/roof above (or through roof)
  • Used for: occupancy separation, exit enclosures, incidental use separation, shaft enclosures, horizontal exits
  • Rating: per table requirements (typically 1-2 hr)
Fire Partition (IBC 708):
  • May terminate at underside of fire-rated floor/ceiling or roof/ceiling assembly above
  • Used for: dwelling unit separation, sleeping unit separation, corridor walls
  • Rating: typically 1 hr (0.5 hr for corridor in some sprinklered conditions)
Smoke Barrier (IBC 709):
  • Continuous membrane from outside wall to outside wall or floor to floor
  • Used for: I-2 smoke compartments, I-3 smoke compartments
  • Rating: 1 hr minimum, with smoke-tight construction
防火墙(IBC 706):
  • 结构独立(自承重,即使两侧建筑结构倒塌仍能保持站立)
  • 在高度/面积计算中可视为独立建筑
  • 耐火等级:2小时(R、B、E、M类)至4小时(H、F-1、S-1类)
防火分隔墙(IBC 707):
  • 从本层楼板连续延伸至上层楼板/屋盖底面(或穿透屋盖)
  • 用途:使用功能分隔、出口围护、附属用房分隔、竖井围护、水平疏散出口
  • 耐火等级:按表格要求(通常1-2小时)
防火隔墙(IBC 708):
  • 可终止于上层耐火楼板/吊顶或屋盖/吊顶组合体的底面
  • 用途:居住单元分隔、就寝单元分隔、走廊墙体
  • 耐火等级:通常1小时(部分设自动喷水灭火系统的走廊为0.5小时)
防烟隔墙(IBC 709):
  • 从外墙到外墙或从楼板到楼板的连续分隔体
  • 用途:I-2类防烟单元、I-3类防烟单元
  • 耐火等级:最低1小时,且需具备防烟密闭构造

Occupancy Separation (IBC Table 508.4)

使用功能分隔(IBC表508.4)

When different occupancies share a building using the separated occupancy method:
Adjacent OccupanciesSeparation (hr) S / NS
A, B, E, M, R, S / A, B, E, M, R, S1 / 2
A, B, E, M, R, S / F-1, S-11 / 2
A, B, E, M, R, S / H-1NP / NP
A, B, E, M, R, S / H-22 / 3
A, B, E, M, R, S / H-3, H-4, H-51 / 2
A, B, E, M, R, S / I-1, I-3, I-41 / 2
A, B, E, M, R, S / I-22 / NP
H-1 / anyNP / NP
(S = sprinklered, NS = nonsprinklered, NP = not permitted)
当不同使用功能共存于同一建筑且采用分隔式使用功能设计方法时:
相邻使用功能分隔耐火等级(小时) S / NS
A, B, E, M, R, S / A, B, E, M, R, S1 / 2
A, B, E, M, R, S / F-1, S-11 / 2
A, B, E, M, R, S / H-1NP / NP
A, B, E, M, R, S / H-22 / 3
A, B, E, M, R, S / H-3, H-4, H-51 / 2
A, B, E, M, R, S / I-1, I-3, I-41 / 2
A, B, E, M, R, S / I-22 / NP
H-1 / 任意NP / NP
(S = 设自动喷水灭火系统,NS = 未设自动喷水灭火系统,NP = 不允许)

Shaft Enclosures (IBC 713)

竖井围护(IBC 713)

  • Shafts connecting 4 or fewer stories: 1-hour fire barrier
  • Shafts connecting more than 4 stories: 2-hour fire barrier
  • Applies to: elevator shafts, mechanical shafts, stairways, garbage chutes, laundry chutes, duct shafts
  • 连接4层及以下的竖井:1小时耐火等级的防火分隔墙
  • 连接4层以上的竖井:2小时耐火等级的防火分隔墙
  • 适用范围:电梯井、机电竖井、楼梯间、垃圾道、洗衣道、风管井

Corridor Fire Rating (IBC Table 1020.1)

走廊耐火等级(IBC表1020.1)

OccupancySprinkleredNonsprinklered
H-1, H-2, H-31 hr1 hr
H-4, H-51 hr1 hr
I-20 hr*NP
I-1, I-30 hr*1 hr
A, B, E, F, M, S, U0 hr1 hr
R0.5 hr1 hr
(*Corridor walls in I occupancies are often required by other sections to be smoke partitions regardless of Table 1020.1 rating.)

使用功能设自动喷水灭火系统未设自动喷水灭火系统
H-1, H-2, H-31小时1小时
H-4, H-51小时1小时
I-20小时*NP
I-1, I-30小时*1小时
A, B, E, F, M, S, U0小时1小时
R0.5小时1小时
(*I类使用功能的走廊墙体通常还需其他条款要求为防烟隔墙,与表1020.1的耐火等级无关。)

Section 6: Plumbing Fixtures

第6节:卫生器具

Minimum Plumbing Fixture Requirements (IBC Table 2902.1 / IPC Table 403.1)

卫生器具最低要求(IBC表2902.1 / IPC表403.1)

Minimum number of fixtures per occupant by occupancy group:
Assembly (A):
  • Water closets: 1 per 125 males / 1 per 65 females
  • Lavatories: 1 per 200 persons
  • Drinking fountains: 1 per 500 persons
  • Service sinks: 1 per building
Business (B):
  • Water closets: 1 per 25 males / 1 per 25 females (up to 50 occupants); additional per larger counts
  • Lavatories: 1 per 40 persons
  • Drinking fountains: 1 per 100 persons
  • Service sinks: 1 per building
Educational (E):
  • Water closets: 1 per 50 males / 1 per 50 females
  • Lavatories: 1 per 50 persons
  • Drinking fountains: 1 per 100 persons
Mercantile (M):
  • Water closets: 1 per 500 males / 1 per 750 females (per code cycle -- verify current edition)
  • Customer facilities required when floor area > 929 m² (10,000 ft²)
Residential (R-1, R-2):
  • 1 water closet, 1 lavatory, 1 bathtub/shower per dwelling unit or guest room
  • Drinking fountains: 0 (private units)
Industrial / Factory (F):
  • Water closets: 1 per 100 males / 1 per 100 females
  • Lavatories: 1 per 100 persons
  • Drinking fountains: 1 per 400 persons
Institutional (I):
  • Varies by condition: I-2 requires accessible patient bathing and toilet facilities per occupant ratios defined by licensing authorities
  • Typically 1 WC per patient room in hospitals
按使用功能分组的每人均需最少卫生器具数量:
集会类(A):
  • 坐便器:每125名男性1个 / 每65名女性1个
  • 洗手盆:每200人1个
  • 饮水机:每500人1个
  • 洗涤池:每栋建筑1个
办公类(B):
  • 坐便器:(50人及以下时)每25名男性1个 / 每25名女性1个;人数更多时按比例增加
  • 洗手盆:每40人1个
  • 饮水机:每100人1个
  • 洗涤池:每栋建筑1个
教育类(E):
  • 坐便器:每50名男性1个 / 每50名女性1个
  • 洗手盆:每50人1个
  • 饮水机:每100人1个
商业类(M):
  • 坐便器:每500名男性1个 / 每750名女性1个(按规范版本周期——需核实现行版本)
  • 建筑面积超过929平方米(10000平方英尺)时需设置顾客专用卫生间
居住类(R-1、R-2):
  • 每个居住单元或客房设1个坐便器、1个洗手盆、1个浴缸/淋浴间
  • 饮水机:0(私人单元)
工业/工厂类(F):
  • 坐便器:每100名男性1个 / 每100名女性1个
  • 洗手盆:每100人1个
  • 饮水机:每400人1个
机构类(I):
  • 按条件不同有所差异:I-2类需根据许可机构规定的人员比例设置无障碍患者洗浴和如厕设施
  • 医院通常每间病房设1个坐便器

Gender-Neutral / All-User Toilet Provisions

中性/通用卫生间条款

Current code trends (2021 IBC and later amendments):
  • Single-occupant toilet rooms may be designated for use by any gender
  • Multi-stall all-gender restrooms addressed in some jurisdictions
  • Fixture count may be combined when using all-gender single-occupant rooms

当前规范趋势(2021版IBC及后续修订案):
  • 单人间卫生间可指定为任意性别使用
  • 部分管辖地区已出台多隔间通用卫生间的相关规定
  • 采用通用单人间卫生间时,卫生器具数量可合并计算

Section 7: International Code Comparison

第7节:国际规范对比

IBC (United States)

IBC(美国)

  • Scope: Model code adopted by all 50 states (with local amendments)
  • Height limits: Set by construction type and occupancy per prescriptive tables
  • Fire resistance: Prescriptive fire resistance ratings per construction type (Tables 601, 602)
  • Accessibility: ICC A117.1 referenced; ADA/ABA standards enforced federally
  • Energy: IECC (International Energy Conservation Code) or ASHRAE 90.1
  • 适用范围: 被全美50个州采用的示范规范(含地方修订)
  • 高度限制: 按构造类型和使用功能通过规定性表格确定
  • 耐火性能: 按构造类型通过规定性耐火等级确定(表601、602)
  • 无障碍设计: 引用ICC A117.1;联邦层面执行ADA/ABA标准
  • 节能要求: 执行IECC(国际节能规范)或ASHRAE 90.1

Building Regulations (England & Wales)

《建筑规范》(英格兰及威尔士)

  • Scope: Statutory Instruments enforced through Approved Documents A-S
  • Height limits: No prescriptive height/area table; fire strategy and structural design govern feasibility. Approved Document B provides guidance by "purpose group" (equivalent to occupancy)
  • Fire resistance: Approved Document B, Volume 1 (dwellings) and Volume 2 (other buildings). Fire resistance periods: 30 min (up to 5 m height), 60 min (up to 18 m), 90 min (up to 30 m), 120 min (over 30 m). Post-Grenfell: combustible material ban above 18 m (Building Safety Act 2022)
  • Accessibility: Approved Document M (Volume 1: dwellings, Volume 2: other buildings). Category M4(2) accessible and adaptable dwellings; M4(3) wheelchair user dwellings
  • Energy: Approved Document L; Part L 2021 uplift targets ~31% CO2 reduction over 2013 standards; Future Homes Standard 2025 targeting 75-80% reduction
  • 适用范围: 通过A-S号核准文件实施的法定文书
  • 高度限制: 无规定性的高度/面积表格;可行性由消防策略和结构设计决定。核准文件B按“用途组别”(相当于使用功能)提供指导
  • 耐火性能: 核准文件B第1卷(住宅)和第2卷(其他建筑)。耐火时长:30分钟(高度≤5米)、60分钟(≤18米)、90分钟(≤30米)、120分钟(>30米)。格伦费尔事件后:18米以上建筑禁止使用可燃材料(《2022年建筑安全法案》)
  • 无障碍设计: 核准文件M(第1卷:住宅,第2卷:其他建筑)。M4(2)类为无障碍可改造住宅;M4(3)类为轮椅使用者住宅
  • 节能要求: 核准文件L;2021版L部分目标为较2013年标准减排约31%的二氧化碳;2025年《未来住宅标准》目标减排75%-80%

Eurocodes + National Annexes

欧洲规范(Eurocodes)+ 国家附录

  • Scope: Structural design standards (EN 1990-1999) adopted across EU/EEA with nationally determined parameters (NDPs)
  • Height limits: Not addressed by Eurocodes; governed by national building regulations (e.g., Germany: Landesbauordnung, France: Code de la Construction)
  • Fire resistance: EN 1991-1-2 (fire actions), EN 1992-1-2 through EN 1996-1-2 (material-specific fire design). Parametric fire curves as alternative to standard fire
  • Accessibility: EN 17210 (accessibility and usability of the built environment) published 2021; implementation varies by member state
  • Energy: EPBD (Energy Performance of Buildings Directive); nearly zero-energy building (nZEB) requirements since 2021 for all new buildings
  • 适用范围: 欧盟/欧洲经济区采用的结构设计标准(EN 1990-1999),含各国自行确定的参数(NDPs)
  • 高度限制: 欧洲规范未涉及;由各国建筑规范管辖(如德国:《州建筑规范》,法国:《建筑法典》)
  • 耐火性能: EN 1991-1-2(火灾作用)、EN 1992-1-2至EN 1996-1-2(各材料耐火设计)。可采用参数化火灾曲线替代标准火灾曲线
  • 无障碍设计: 2021年发布EN 17210(建成环境的无障碍与可用性);各成员国实施情况不一
  • 节能要求: EPBD(建筑能效指令);2021年起所有新建建筑需满足近零能耗建筑(nZEB)要求

NCC (National Construction Code, Australia)

NCC(国家建筑规范,澳大利亚)

  • Scope: Building Code of Australia (BCA) forms Volume 1 and 2 of NCC
  • Height limits: Determined by building classification (Class 1-10) and type of construction (A, B, C corresponding roughly to IBC Types I, III, V). Rise in storeys and floor area per Table C1.1
  • Fire resistance: NCC Volume 1 Specification C1.1; fire resistance levels (FRL) expressed as structural adequacy / integrity / insulation in minutes (e.g., 120/120/120)
  • Accessibility: NCC Section D (Access and Egress) + AS 1428.1 (Design for Access and Mobility, General Requirements)
  • Energy: NCC Section J (Energy Efficiency); NatHERS for residential
  • 适用范围: 澳大利亚建筑规范(BCA)构成NCC的第1、2卷
  • 高度限制: 由建筑分类(1-10类)和构造类型(A、B、C类大致对应IBC的I、III、V类)决定。层数增加和每层面积按表C1.1执行
  • 耐火性能: NCC第1卷规范C1.1;耐火等级(FRL)以“结构承载力/完整性/隔热性”的分钟数表示(如120/120/120)
  • 无障碍设计: NCC第D节(通行与疏散)+ AS 1428.1(无障碍与通行设计通用要求)
  • 节能要求: NCC第J节(能效);住宅采用NatHERS评级

NBC (National Building Code, Canada)

NBC(国家建筑规范,加拿大)

  • Scope: Model code published by NRC; adopted by provinces with modifications
  • Height limits: Part 3 Table 3.2.2.A (building area and height based on major occupancy and construction type: noncombustible vs combustible)
  • Fire resistance: Part 3 Subsection 3.2.2; fire-resistance ratings by building use and height. Combustible construction limited to 6 storeys (recent amendments allow up to 12 for mass timber in some provinces)
  • Accessibility: CSA B651 (Accessible Design for the Built Environment); NBC Part 3 Section 3.8 (Barrier-Free Design)
  • Energy: NECB (National Energy Code for Buildings) 2020; tiered energy performance targets
  • 适用范围: 加拿大国家研究委员会(NRC)发布的示范规范;各省经修订后采用
  • 高度限制: 第3部分表3.2.2.A(建筑高度与面积基于主要使用功能和构造类型:不燃型vs可燃型)
  • 耐火性能: 第3部分3.2.2小节;耐火等级按建筑用途和高度确定。可燃构造建筑最多6层(近期修订后部分省份的重型木结构最多可达12层)
  • 无障碍设计: CSA B651(建成环境无障碍设计);NBC第3部分3.8节(无障碍设计)
  • 节能要求: 2020版NECB(国家建筑节能规范);采用分级能效目标

Key Comparative Observations

核心对比结论

  1. Prescriptive vs performance: IBC and NBC use prescriptive tables for height/area. UK and Australian codes allow performance-based fire engineering as a standard path, enabling designs exceeding prescriptive limits with adequate justification.
  2. Fire resistance philosophy: IBC rates individual assemblies. UK and Eurocodes focus on whole-building fire strategy with insulation, integrity, and load-bearing criteria assessed separately.
  3. Accessibility scope: ADA focuses on public accommodations and commercial facilities. UK Part M applies to all new buildings including dwellings. Australia AS 1428.1 is among the most stringent for public buildings.
  4. Energy trajectory: All jurisdictions are converging toward near-zero energy new construction by 2030. UK's Future Homes Standard (2025) and EU's EPBD recast (2024) lead with most aggressive targets.
  5. Mass timber: IBC 2021 introduced Type IV-A/B/C for tall mass timber. NBC allows up to 12 stories in some provinces. UK has no prescriptive tall timber path but performance-based approaches have enabled projects up to 10 stories. Australia NCC 2019 introduced provisions for mass timber up to 25 m effective height.

This skill provides general code guidance for architectural decision-making. All code interpretations must be verified against the specific edition adopted by the authority having jurisdiction (AHJ). Building officials have final authority on code compliance.
  1. 规定性vs性能化: IBC和NBC采用规定性表格确定高度/面积。英国和澳大利亚规范允许将性能化消防工程作为标准路径,在充分论证的前提下可突破规定性限制。
  2. 耐火设计理念: IBC对单个构件进行耐火评级。英国和欧洲规范聚焦整体建筑消防策略,分别评估隔热性、完整性和承重性能。
  3. 无障碍设计范围: ADA聚焦公共住宿和商业设施。英国M部分适用于所有新建建筑,包括住宅。澳大利亚AS 1428.1是公共建筑领域最严格的标准之一。
  4. 节能发展趋势: 所有司法管辖区都在向2030年新建建筑近零能耗的目标靠拢。英国的《未来住宅标准》(2025)和欧盟的EPBD修订版(2024)目标最为激进。
  5. 重型木结构: 2021版IBC新增了高层重型木结构的IV-A/B/C型。NBC在部分省份允许最多12层。英国无规定性高层木结构路径,但性能化方法已支持建成最高10层的项目。澳大利亚2019版NCC新增了有效高度最高25米的重型木结构条款。

本技能为建筑决策提供通用规范指导。所有规范解释均需对照具有管辖权的机构(AHJ)采用的具体版本核实。建筑官员对规范合规性拥有最终决定权。