防火分区与防烟分区的划分目的有何不同?
What is the difference in purpose between fire compartments and smoke control zones?
防火分区通过耐火墙体、楼板和卷帘限制火灾在建筑内的水平与竖向蔓延,为疏散和扑救争取时间,其面积受耐火等级和层数约束。防烟分区则配合排烟设施控制烟气流动范围,通常利用挡烟垂壁在防火分区内进一步细分。前者控火,后者控烟,两者边界可以重合但功能要求不同。
Fire compartments limit horizontal and vertical fire spread within a building using rated walls, floors, and shutters, buying time for evacuation and firefighting; their allowable area depends on fire-resistance rating and story count. Smoke control zones confine smoke movement around exhaust facilities, typically subdividing a fire compartment with draft curtains. The former controls fire, the latter controls smoke; their boundaries may coincide but their functional requirements differ.
难度 进阶 · 适合 初中(12-15)
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《建筑设计防火规范》GB 50016-2014(2018年版),第6章防火分区与防烟分区条文
Code for Fire Protection Design of Buildings GB 50016-2014 (2018 edition), Chapter 6 provisions on fire and smoke compartments
#消防工程 #防火防烟分区
性能化防火设计中,为什么不能只用构件耐火极限时长来判断人员是否安全,而要做 ASET 与 RSET 的比较?
In performance-based fire safety design, why can't occupant safety be judged from a single fire-resistance duration alone, instead of comparing ASET with RSET?
性能化设计的基本判据是可用安全疏散时间(ASET)大于所需安全疏散时间(RSET),前者取决于火源热释放速率、通风条件、烟气层下降速度和人员响应时间分布。构件耐火极限只描述它在标准升温曲线下的失效时刻,既不涵盖烟气蔓延与毒性的危害,也不代表真实火灾的发展进程。只有针对设定火场景计算 ASET 并留出足够裕度覆盖 RSET,才能论证设计方案达到与规范要求等效的安全水平。
Performance-based design rests on the criterion that available safe egress time (ASET) must exceed required safe egress time (RSET), where ASET depends on heat release rate, ventilation, smoke layer descent and the distribution of occupant pre-movement times. A fire-resistance rating only tells you when a member fails under the standard heating curve; it says nothing about smoke spread, toxic products, or how a real fire develops. Only by modeling the design fire, computing ASET and keeping a sufficient margin over RSET can the scheme be argued to deliver safety equivalent to prescriptive requirements.
难度 进阶 · 适合 大众
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SFPE Handbook of Fire Protection Engineering 第5版性能化设计与人员疏散章节
SFPE Handbook of Fire Protection Engineering, 5th ed., performance-based design and human behavior chapters
#性能化防火设计 #疏散时间裕度
火灾自动报警系统中,感烟探测器安装高度和房间通风速率如何影响其响应时间?
In automatic fire alarm systems, how do detector mounting height and room ventilation rate affect smoke detector response time?
顶棚射流把燃烧产物沿天花板水平输送,探测器必须位于射流厚度内才能及时感知,安装越高烟到达浓度衰减越快,响应延迟明显增大——规范因此对点型感烟探测器的最大保护高度设限(如GB 50116规定不超过12 m)。机械通风加速烟气稀释与迁移,高速气流会冲散上升烟羽并把烟推出保护区,需加大灵敏度或改用吸气式感烟探测器(ASD)通过管网主动采样。
The ceiling jet carries combustion products horizontally along the ceiling, and the detector must sit within that jet thickness to sense smoke promptly; the higher the mounting, the faster the smoke concentration decays before arrival, which is why codes cap the protected height for point-type smoke detectors (e.g. GB 50116 limits it to 12 m). Mechanical ventilation dilutes and transports smoke away, and strong airflows can disperse the plume and sweep smoke out of the protected volume, requiring higher sensitivity or aspirating smoke detection (ASD) with active pipe sampling.
难度 进阶 · 适合 大众
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GB 50116-2013《火灾自动报警系统设计规范》第6.2节 / NFPA 72-2022 Chapter 17
NFPA 72-2022 National Fire Alarm and Signaling Code, Chapter 17; GB 50116-2013 Code for Design of Automatic Fire Alarm System, Section 6.2
#火灾自动报警 #感烟探测