基于模拟退火优化算法的在役梁桥可靠性分析  

The Reliability Anaiysis of a Girder Bridge In-Service Based on Simulated Annealing Optimization Algorithm

作　　者：包龙生[1] 祝孝成[1] 于玲[1] 

机构地区：[1]沈阳建筑大学土木工程学院,辽宁沈阳110168

出　　处：《沈阳建筑大学学报（自然科学版）》2012年第2期257-262,共6页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家自然科学基金项目(51078242);住房和城乡建设部科学技术项目(2010-K3-38)

摘　　要：目的对在役钢筋混凝土梁桥进行可靠性分析,评价其承载能力和安全度,确保桥梁正常营运.方法针对目前现有可靠度计算方法存在的缺点,提出了一种求解在役钢筋混凝土梁桥结构可靠度指标的优化算法—模拟退火算法.基于可靠度指标的几何涵义,运用模拟退火算法原理,建立可靠指标的优化模型,应用Matlab语言编制程序进行可靠性分析.结果建立在役钢筋混凝土梁桥结构的抗力与荷载模型,结合实例对一座服役30年的钢筋混凝土T型梁桥的可靠指标进行了计算,计算得可靠指标为β=3.915 3,满足规范安全要求.结论计算结果验证了该优化算法可行性和正确性,为在役混凝土梁桥可靠度计算提供一种新的思路.This paper aims at analyzing the reliability ting its carrying capacity and safety margin, ensuring of reinforced concrete girder bridge in service, evaluanormal operation of the bridge. In view of the shortcomings of the existing structure reliability calculation method, proposed a solution of reinforced concrete solve the existing reinforced concrete girder bridge in service reliability index structure reliability index optimization algorithm-simulated annealing algorithm. Based on the geometric meaning of reliability index, using the principle of simulated annealing algorithm, established the optimization model of reliable indicator for reliability analysis by Matlab programming language. Established the load and resistance model of reinforced concrete girder bridge in-service, calculated the reliable indicator of a thirty years reinforced concrete T-beam bridge for instance and the result as 3. 9153 ,met the feasibility and correctness of the optimization the reinforced concrete girder bridge in-service. the safety requirements specification. The results validated algorithm, provid a new ideas for reliability calculation of the reinforced concrete girder bridge in-service.

关 键 词：在役钢筋混凝土桥梁 可靠性分析 优化算法 模拟退火算法 可靠指标 

分 类 号：U442.5[建筑科学—桥梁与隧道工程]