基于支持向量机的大跨连续刚构桥可靠度分析  

Computation of structural reliability of long-span rigid form bridge based on the support vector machine

作　　者：刘扬[1] 曾浩[1] 

机构地区：[1]长沙理工大学土木与建筑学院,湖南长沙410004

出　　处：《交通科学与工程》2014年第4期38-43,共6页Journal of Transport Science and Engineering

基　　金：国家自然科学基金资助项目(50608009;51008036);教育部新世纪优秀人才支持计划(NCET-10-0319);交通部应用基础研究项目(2006319825070;2010318000006)

摘　　要：针对大跨连续刚构桥在可靠性分析过程中功能函数不能显示、表达的问题,提出了一种基于支持向量机分类功能可靠度的计算方法。采用拉丁超立方抽样产生一定样本的数据库,通过改变样本点中效应数据的大小,并结合有限元程序的分析,找出一定精度下离分类面最近的一对样本点,从而得到新的样本库。然后,用新的样本库构造出一个SVM分类器函数。结合蒙特卡罗数值模拟,计算其失效概率。以四川某大跨连续刚构桥为例,验证了该方法的实用性。In order to cope with the problems that the limit state equations can not be displayed and expressed in the solving process of structural system reliability of long span bridge,a method for computation of the reliability based on the support vector ma-chine classification technique is proposed.Gathering a certain number of samples by u-sing the Latin hypercube sampling method and with the finite element calculation,the proposed method can find the same number of couples of new samples that is on both sides of the classification of surface nearly,by changing the data of load.Using the new samples,the method can construct a precise SVM classification function.The numerical simulation and computation of the system failure probability are accordingly carried out by using the Monte Carlo method.By way of examples of a long-span rigid form bridge in Sichuan,the practicability of the method for computation of the system reliability of long span bridge is verified.

关 键 词：支持向量机 可靠度 失效概率 大跨连续刚构 

分 类 号：U448.23[建筑科学—桥梁与隧道工程]