摘要
为了研究结构抗竖向连续倒塌鲁棒性,结合竖向连续倒塌过程中框架结构内力特征,针对性地提出了构件易损性系数,并对已有的一种结构鲁棒性计算方法进行了简化和改进,通过对钢筋混凝土(Reinforced concrete,RC)框架结构有限元模型分析进行验证.研究表明:结构鲁棒性强弱是一个相对概念,降低重要竖向承重构件的易损性系数能够增强结构抗连续倒塌的鲁棒性;在同样荷载作用下,框架柱易损性系数按照大小排序依次为中柱、边柱和角柱,而重要性系数按照大小排序则依次为角柱、边柱和中柱,对易损性系数和重要性系数均较大的构件设置可靠保护或增加荷载传递路径都能够提高整体结构抗连续倒塌的鲁棒性.
In order to study the progressive-collapse resistance robustness of reinforced concrete （PC） frame, a target-oriented component vulnerability coefficient was proposed in combination with internal force feature of frame structure in the collapse process, and an existing structural robustness coefficient was improved. The practicability of method has been verified by computing a finite element model of reinforced concrete frame structure. Result shows that structural robustness is a relative concept, and can be enhanced by reducing member vulnerability coefficient of important columns. Under the same load, the vulnerability coefficient of frame columns can be ranked as middle column, side column and corner column, and the member importance coefficients prove to be opposite. The component with large vulnerability coefficient and importance coefficient should be protected to ensure the stronger robustness of the structure.
出处
《西安建筑科技大学学报（自然科学版）》
CSCD
北大核心
2015年第2期171-175,209,共6页
Journal of Xi'an University of Architecture & Technology(Natural Science Edition)
基金
国家自然科学基金资助项目(51178211)
关键词
安全设计
框架结构
连续倒塌
结构鲁棒性
构件易损性系数
构件重要性系数
safety design
frame structure
progressive collapse
structural robustness
member vulnerability coefficient
member importance coefficient
