基于响应面法的连续刚构桥梁体系可靠度分析  

Analysis on system reliability of rigid frame bridge based on response surface method

作　　者：刘扬[1,2] 鲁乃唯[1] 

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试验室,湖南长沙410004

出　　处：《交通科学与工程》2010年第4期24-29,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项目(2009);交通部应用基础研究项目(2006319825070)

摘　　要：为了解决分析桥梁结构可靠度时功能函数不存在显式的问题,在现有响应面法的基础上,提出了改进的响应面法;利用有限元软件,对某高墩大跨连续刚构进行了受力分析;选取压应力、拉应力和稳定性失效3类失效模式,在改进的响应面法基础上,利用编程软件MATLAB,实现连续刚构桥梁体系可靠度的计算.算例分析表明,该方法迭代次数少,效率较高,可实现连续刚构桥功能函数重构和体系可靠度计算.The explicit performance functions of bridges do not usually exist.An improved response surface method is proposed.FEM is used to analyze a long-span continuous rigid frame bridge.On the other hand,three types of failure modes including compressive stress failure,tensile stress failure and stability failure are studied.MATLAB is used to calculate the system reliability.The results show that the iteration time of this method is less than the traditional ones and the method is efficient.The method can be served as a new method for approximation of performance function of bridges and calculation of system reliability.

关 键 词：连续刚构桥 改进的响应法 体系可靠度 失效模式 

分 类 号：U448.23[建筑科学—桥梁与隧道工程]