建筑钢结构中钢构件的防火性能与抗火设计研究  

Research on fire performance and fire resistance design of steel members in construction steel structures

作　　者：方垒 徐伟良[2] 

机构地区：[1]杭州消防支队滨江大队浦沿中队,浙江杭州310053 [2]浙江工业大学建工学院,浙江杭州310014

出　　处：《火灾科学》2011年第3期146-151,共6页Fire Safety Science

摘　　要：首先有针对性地对当前国内外建筑钢结构中钢构件的防火性能与抗火设计研究背景做了较系统分析,接着,通过有限元程序,对当前应用非常广泛的半刚接门式刚架建筑在火灾高温下的受力性能进行了整体结构非线性分析。计算结果表明:随着温度的升高,钢构件节点的刚度不断下降,当节点的刚度下降到不能约束与其连接的梁柱构件时,结构将发生突然坍塌性破坏;由于在高温下钢材的屈服强度下降较快,半刚性连接性能虽然能使梁柱节点处的受力性能改善,但不能提高整体结构的临界温度。This paper first makes a summary on the current research status for the fire performance and fire resistance design of construction steel structure steel members,and then,it uses a finite element program to conduct a nonlinear analysis on the mechanical properties of the overall structure for the door type frame construction under high temperatures in fire.The results show that,with the increase of temperature,the stiffness of the steel members node decreases.When the stiffness of the node is not enough to support the structure constraint for the connected beam-column components,the structure will collapse.Due to that in high temperatures the strength of the steel decreases quickly,although the semi-rigid connection performance can improve the mechanical properties for the beam-column joints,the critical temperature for the failure of the overall structure could not be increased.

关 键 词：钢构件 防火性能 抗火设计 有限元 刚度 临界温度 

分 类 号：TU[建筑科学]