梁轨纵向位移阻力系数双弹簧模型研究  

A DOUBLE-SPRING MODEL FOR LONGITUDINAL DISPLACEMENT-RESISTANCE RELATIONSHIP OF FASTENERS IN RAIL-BRIDGE INTERACTION ANALYSIS

作　　者：吴定俊[1] 石龙[1] 李奇[1] 

机构地区：[1]同济大学桥梁工程系,上海200092

出　　处：《工程力学》2015年第10期75-81,共7页Engineering Mechanics

基　　金：国家自然科学基金项目(51278374)

摘　　要：对考虑加载历程的城市轨道交通桥梁梁轨非线性相互作用问题进行了研究。基于DT-2扣件位移阻力试验结果和分析,提出适用于加载历程的扣件"双弹簧模型"。采用该模型进行梁轨相互作用计算,并与传统线性叠加方法进行对比分析。结果表明:传统"线性叠加"法在钢轨拉压力计算上偏于保守,而在梁轨相对位移与墩顶纵向水平位移计算上偏于不安全。The rail-bridge nonlinear interaction problem for urban rail transit system is investigated with loading histories considered. A double-spring model is proposed to account for the change of resistance properties of the fastener under various load cases, based on the longitudinal displacement and resistance experiments for the DT-2 fastener. This model is then applied to rail-bridge interaction calculation in a case study and the results are compared with traditional linear superposition method. It is found that the traditional method is conservative for the internal forces of the rails but unsafe for the rail-bridge relative displacements and longitudinal displacements of piers.

关 键 词：梁轨相互作用 加载历程 双弹簧模型 钢轨纵向附加力 梁轨相对位移 

分 类 号：U441.7[建筑科学—桥梁与隧道工程]