摘要
火灾下建筑结构的倒塌是整体结构系统的力学行为。由于整体结构火灾试验难度较大,数值模拟是研究整体结构火灾行为的重要手段。该文采用考虑高温作用的纤维梁和分层壳模型以及生死单元技术,对一实际框支砌体结构的火灾倒塌事故进行了分析,模拟了整体结构在火灾作用下的倒塌过程,指出了引起结构火灾倒塌的关键原因,并根据数值分析结果对火灾下抗连续倒塌设计提出了改进建议。
The fire-induced collapse of building structures is the mechanical behavior of entire structural systems. Due to the difficulty in the fire test for overall structural systems, numerical simulation is an important method to study the global behaviors of structures under fire. The fiber beam model, multi-layer shell model and elemental deactivation technology that allows for the effect of high temperature are used to simulate a real fire-induced collapse accident of a frame-supported masonry building. The primary reason of the collapse is pointed out. Design recommendations to improve of the progressive collapse resistance of building structures are also proposed based on the numerical results.
出处
《工程力学》
EI
CSCD
北大核心
2014年第2期66-72,共7页
Engineering Mechanics
基金
国家973项目(2012CB719703)
国家自然科学基金项目(51208011)
上海市工程结构新技术重点实验室开放课题(2011-KF02)
北京市教委科研计划项目(KM201310005025)
国家博士后科学基金项目(2012M510301)
北京市博士后科研项目(2012ZZ-13)
关键词
火灾倒塌
框支砌体结构
数值模拟
纤维梁
事故分析
fire-induced collapse
frame-supported masonry structure
numerical simulation
fiber beam
failureanalysis
