基于SVM的连续刚构桥施工阶段及使用阶段可靠度研究  

Research on Reliability of Continuous Rigid Frame Bridge in Construction and Service Stages Based on Support Vector Machines

作　　者：林友杨 王向阳[2] 关舒元 吴琼 LIN Youyang;WANG Xiangyang;GUAN Shuyuan;WU Qiong(Hubei Provincial Communications Planning and Design Institute Co. Ltd., Wuhan 430051, China;School of Transportation,Wuhan University of Technology, Wuhan 430063, China)

机构地区：[1]湖北省交通规划设计院股份有限公司,武汉430051 [2]武汉理工大学交通学院,武汉430063

出　　处：《武汉理工大学学报（交通科学与工程版）》2019年第3期522-528,共7页Journal of Wuhan University of Technology（Transportation Science & Engineering）

基　　金：国家自然科学基金项目(51178361);湖北省自然科学基金项目(2013CFB342)资助

摘　　要：针对国内外许多桥梁在施工或者在已经使用的过程中发生的结构坍塌倾覆等现象,以湖北黄石市富水河大桥为工程背景,采用支持向量机(support vector machine,SVM)算法对桥梁结构施工阶段及使用阶段的可靠度进行计算分析.先通过试验得到桥梁施工现场C50混凝土材料性能随时间的变化规律,进而采用midalCivil软件建立连续刚构桥悬臂施工阶段和使用阶段的有限元模型,最后基于支持向量机分类算法对该连续刚构桥梁施工阶段的标高控制可靠度以及使用阶段中的可靠度进行计算分析.结果表明,混凝土弹性模量随着养护时间呈非线性变化,选用幂函数来拟合变化规律最合时宜.In view of the collapse and overturning of many bridges at home and abroad during construction and service stages, taking Fushui River Bridge in Huangshi City, Hubei Province as the research object, support vector machine (SVM) algorithm was used to calculate and analyze the reliability of the bridge structure in the construction and service stages. The change rule of C50 concrete material performance with time on the bridge construction site was obtained through experiments, and the finite element model of continuous rigid frame bridge cantilever construction stage and service stage was established by MIDAS/Civil software. Finally, based on the classification algorithm of support vector machine, the reliability of elevation control in the construction phase and the reliability in the use phase of the continuous rigid frame bridge were calculated and analyzed. The results show that the elastic modulus of concrete changes nonlinearly with curing time, and it is most appropriate to use power function to fit the change rule.

关 键 词：桥梁 可靠度 支持向量机 材料试验 

分 类 号：U444[建筑科学—桥梁与隧道工程]