基于能量方法的RC框架结构连续倒塌抗力需求分析Ⅱ:悬链线机制  

Progressive collapse resistance demand of RC frame structures based on energy method Ⅱ: catenary mechanism

作　　者：李易[1,2] 陆新征[2] 叶列平[2] 

机构地区：[1]北京工业大学城市与工程安全减灾教育部重点实验室,北京100124 [2]清华大学土木工程安全与耐久教育部重点实验室,北京100084

出　　处：《建筑结构学报》2011年第11期9-16,共8页Journal of Building Structures

基　　金：国家重点基础研究发展计划(973)项目(2012CB719703);国家科技支撑计划项目(2006BAJ03A02);教育部新世纪优秀人才支持计划项目(NCET-10-0528)

摘　　要：悬链线机制下的连续倒塌抗力需求计算是RC框架结构大变形阶段抗连续倒塌设计的关键。现有规范方法没有考虑非线性动力效应对该阶段抗力需求的影响,因而导致不安全的设计结果。根据RC框架结构基于能量平衡原理的抗连续倒塌抗力需求分析的理论框架,推导了RC框架结构在悬链线机制下抗连续倒塌子结构及其构件的非线性动力抗力需求与非线性静力抗力需求之间的关系,建立了RC框架结构悬链线机制下连续倒塌抗力需求计算的理论方法。通过数值算例验证了本文方法能够正确描述RC框架在悬链线机制下的连续倒塌抗力需求关系。The key issue of the progressive collapse（PC） design of RC frame structures at large deformation stage is to calculate the PC resistance demand of the structure under catenary mechanism.The existing design codes for PC design are unsafe because of ignoring the effect of nonlinear dynamic behavior of PC resistance demand under catenary mechanism.According to the theoretical framework of the PC resistance demand analysis based on the energy conservation principle,the relationship between the nonlinear dynamic and nonlinear static PC resistance demands for RC frame structures under catenary mechanism was derived.And the theoretical method to calculate the PC resistance demand of RC frame structures under catenary mechanism was established.At last,the proposed method describing the PC resistance demand relationship of RC frames with catenary mechanism was validated through numerical examples.

关 键 词：RC框架结构 抗连续倒塌 悬链线机制 抗力需求 能量方法 

分 类 号：TU375.401[建筑科学—结构工程]