列车交汇过桥时预应力混凝土轨道箱形桥梁动力可靠度研究  

Research on dynamic reliability of prestressed concrete track box beam bridges when trains cross bridges

作　　者：邵满秋 宋拓[1] 赵苗杰 Shao Manqiu;Song Tuo;Zhao Miaojie(College of Civil Science and Engineering,Yangzhou University,Yangzhou 225000,Jiangsu;Zhejiang Provincial Architectural Design Institute,Hangzhou 310000)

机构地区：[1]扬州大学建筑科学与工程学院,江苏扬州225000 [2]浙江省省直建筑设计院,杭州310000

出　　处：《工程建设》2019年第11期17-20,39,共5页Engineering Construction

基　　金：江苏省高校自然科学基金(16KJB560019)

摘　　要：为了研究轨道桥梁在列车交汇时的不利状况,在考虑预应力混凝土材料变异性的基础上,采用子集模拟法分析了两列列车在桥梁上交汇而行时以结构跨中挠度为基准的轨道桥梁动力可靠度。通过ANSYS软件建立预应力轨道箱形桥梁的模型,同时基于APDL语言编制了子集模拟法的桥梁动力可靠度分析流程。研究结果表明:列车行驶速度从250 km/h增加到350 km/h,桥梁失效概率从3.14×10^-8增加到5.3×10^-6,变化幅度较小;混凝土弹性模量变异系数从0.08增加到0.2,桥梁失效概率从4.14×10^-19增加到2.5×10^-4。由此可见,轨道桥梁动力可靠度主要受混凝土材料性能的影响,列车行驶速度的影响较为有限。In order to study the unfavorable condition of railway bridges during the intersection of trains,based on the consideration of the variability of prestressed concrete materials,the sub-set simulation method is used to analyze the reliability of railway bridges with the medium deflection of structure span as the reference when two trains meet and intersect on the bridge.The model of prestressed rail track box beam bridge is established by using ANSYS software.At the same time,the reliability analysis process of bridge structure of subset simulation method is compiled based on APDL language.The research results show that,the train speed increases from 250 km/h to 350 km/h,the bridge failure probability increases from 3.14×10^-8 to 5.3×10^-6 with a small change;the variation coefficient of elastic modulus of concrete increases from 0.08 to 0.2,and the probability of bridge failure increases from 4.14×10^-19 to 2.5×10^-4.It can be seen that the dynamic reliability of the track bridge is mainly affected by the performance of the concrete material,and the influence of the train speed is limited.

关 键 词：桥梁动力可靠度 失效概率 子集模拟法 列车行驶速度 弹性模量 

分 类 号：U441.3[建筑科学—桥梁与隧道工程]