摘要
为在建筑结构设计时考虑地震引发火灾对建筑结构的作用和影响,提出建筑结构地震火灾效应分析计算方法,此方法结合结构地震反应分析与火灾热力反应分析,通过简化的建筑结构地震损伤模型,考虑地震损伤的同时,连接结构的热传导分析与热力分析,从而实现地震火灾效应计算。运用此方法对一单层和一多层混凝土框架分别进行了分析,并与没有考虑地震损伤时框架的高温试验结果进行了对比,分析结果表明,考虑地震作用后的结构在火灾下的破坏形态可发生改变,结构耐火极限随着地震作用的增加而降低。
Considering the impact of post-earthquake fire on building structures in structure design,an analysis method is proposed to analyze and simulate the response of building structures under post-earthquake fire.Based on the seismic response and thermal stress analysis,this method considers the structure seismic damage through a simplified seismic damage model,and the simulation of the response of building structures under post-earthquake fire was reached by linking the heat transfer analysis and thermal stress analysis to the results of seismic damage.A single-storey concrete frame and a multi-story concrete frame were analyzed with this method and compared with experimental results of the same concrete frame under fire without seismic damage.It is shown that the collapse mode may change for seismic damaged structures and the fire resistance decreases with the increasing of seismic damage degree.
出处
《土木建筑与环境工程》
CSCD
北大核心
2011年第6期90-95,119,共7页
Journal of Civil,Architectural & Environment Engineering
基金
国家自然科学基金项目资助(50908006)
关键词
地震次生火灾
耐火极限
地震损伤模型
分析方法
post-earthquake fire
fire resistance
seismic damage model
analysis method
