高层建筑结构体系可靠度分析的弹性调整-QR法  

ELASTIC ADJUSTMENT-QR METHOD FOR SYSTEM RELIABILITY ANALYSIS OF TALL BUILDING STRUCTURES

作　　者：梁汉吉[1,2] 秦荣[1] 李秀梅[1] 

机构地区：[1]广西大学土木建筑工程学院,广西南宁530004 [2]广西华蓝设计集团公司,广西南宁530011

出　　处：《工程力学》2009年第9期74-79,共6页Engineering Mechanics

基　　金：国家自然科学基金项目(19872020);广西科学研究与技术开发项目(桂科攻06138005)

摘　　要：介绍了作者提出的高层建筑结构体系可靠度分析的弹性调整-QR法。首先,介绍了高层建筑结构分析的QR法。其次,根据结构塑性极限分析的下限定理、弹性补偿法及QR法相结合,建立了结构塑性极限分析的弹性调整-QR法,克服了塑性铰模型-有限元法分析高层建筑结构塑性极限荷载的缺陷。最后,建立了高层建筑结构可靠度分析的新方法,基本原理如下:利用弹性调整-QR法求解结构体系塑性极限荷载;利用塑性极限荷载建立体系的极限状态方程;利用极限状态方程获得结构可靠指标,由此求出高层建筑结构体系的可靠度。这种方法只寻找结构塑性极限荷载,避免了寻找结构体系失效模式的困难及缺陷,简化了失效概率的计算工作。Elastic adjustment-QR method for system reliability analysis of tall building structures is presented. First of all, the QR method for the analysis of tall building structures is introduced. Next, elastic adjustment-QR method for plastic limit analysis of tall building structures is presented. This method is based on the theorem of lower limit, elastic compensation and QR method, and it is a new method for plastic limit analysis of structures, overcoming the defects of analyzing tall building structures by plastic hinge-finite element method. At last, a new method for system reliability analysis of tall building structures is presented. The principle is as follows： Find the plastic limit load by the elastic adjustment-QR method; Establish limit state expression in terms of plastic limit load; Find reliability index of structures; Find system reliability by reliability index. This method avoids the difficulties and defects of finding collapse mechanism for tall building structures, and simplifies the computation of failure probability.

关 键 词：高层建筑结构 体系可靠度 QR法 弹性调整-QR法 塑性极限荷载 

分 类 号：TU311.2[建筑科学—结构工程] TU973