混凝土斜拉桥移动支架法施工阶段挠度可靠性分析  

Deflection reliability analysis of concrete cable-stayed bridges with removable support system during construction

作　　者：刘扬[1] 任开亮[2] 

机构地区：[1]长沙理工大学土木与建筑学院,湖南长沙410004 [2]"桥梁工程安全控制"省部共建教育部重点实验室,湖南长沙410004

出　　处：《交通科学与工程》2011年第1期46-50,73,共6页Journal of Transport Science and Engineering

基　　金：国家自然科学基金项目(50608009);教育部新世纪优秀人才支持计划(2009);交通部应用基础研究项目(2006319825070);湖南省教育厅科技项目(06c112)

摘　　要：从施工控制的角度出发,针对斜拉桥施工期可靠度分析中不存在显示极限状态函数的问题,利用虚拟中间变量法在标准正态空间内重构挠度极限状态曲面;并以挠度控制为目标函数,对斜拉桥施工过程中的主梁可靠度进行计算分析;同时借助大型有限元软件,对斜拉桥施工过程的支架系统进行了准确模拟,有效分析了移动支架对斜拉桥施工期的可靠性影响.分析结果表明:支架系统材料的变异对施工期的主梁前端挠度可靠性有一定的影响;支架的几何尺寸变更对前端挠度可靠性有较大的影响;合理地选择支架施工方案可以在满足施工可靠性前提下提高工程经济性.The performance functions of cable-stayed bridges are usually implicit,which makes the reliability analysis of bridges difficult.The performance function approximation is implemented in the standard normal space of random variables by using virtual intermediate variable method.Deflection limit condition is regarded as the objective function for the bridge girder during construction.And the reliability is analyzed.Meanwhile,the effectiveness of the removable support system on the bridge reliability during construction period is studied.The results show that the variations of the removable support system material parameters have a certain influence on the deflection reliability of the girders,and the support geometry has greater impact on it.The conclusions can be served as the basis to obtain reasonable construction method.

关 键 词：移动支架 斜拉桥 可靠度 施工阶段 虚拟中间变量法 

分 类 号：U448.27[建筑科学—桥梁与隧道工程]