基于能量方法的RC框架结构连续倒塌抗力需求分析Ⅰ:梁机制  

Progressive collapse resistance demand of RC frame structures based on energy method I: beam mechanism

作　　者：李易[1,2] 叶列平[2] 陆新征[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1-8,共8页Journal of Building Structures

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

摘　　要：结构抗连续倒塌设计方法的关键是确定因偶然作用导致局部构件失效后剩余结构的连续倒塌抗力需求。现有规范对连续倒塌抗力需求计算采用经验系数法,因缺乏理论基础,难以合理考虑结构连续倒塌过程中的非线性和动力效应的影响,其可靠性不足。基于能量方法,建立了RC框架结构连续倒塌抗力需求分析的理论框架,推导出RC框架结构梁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线性静力抗力需求之间的关系,通过该关系对线性静力抗力需求的修正,能够综合考虑RC框架结构在梁机制下连续倒塌过程中的非线性和动力效应的影响。通过数值算例分析了现有规范中经验系数法的问题,验证了本文方法的正确性。The key issue of the progressive collapse（PC） design method is to determine the PC resistance demand of the structure with removed members due to accidental action.The empirical parameters that are adopted in the design methods of the existing codes are difficult to reasonably consider the effect of nonlinear and dynamic behavior during the PC process of building structures due to the weak theoretical basis.A theoretical framework for the PC resistance demand analysis of RC frame structures was established based on the energy conservation principle.In this framework,the relationship between the nonlinear dynamic and linear static PC resistance demands for RC frame structures with beam mechanism to resist PC was derived.The influences of nonlinear and dynamic behaviors were comprehensively considered so that the nonlinear dynamic PC resistance demands could obtained by using the linear static analysis.At last,the empirical parameters in existing codes were discussed and the proposed demand relationship based on the energy conservation principle was validated through numerical examples.

关 键 词：RC框架结构 抗连续倒塌 梁机制 抗力需求 能量方法 

分 类 号：TU375.401[建筑科学—结构工程]