考虑加载历程的轨道桥梁梁轨相互作用研究
首发时间:2013-12-03
摘要:基于扣件纵向位移阻力关系的弹塑性滞回模型,建立城市轨道交通简支高架桥与钢轨相互作用模型,进行了考虑加载历程的梁轨相互作用研究。首先介绍了计算采用的模型及相关参数;然后比较了考虑加载历程与传统线性叠加方法在钢轨纵向附加力计算结果上的差异,分析了往复荷载历程作用下钢轨纵向附加力的特点,发现了钢轨在循环荷载历程作用下存在收敛的残余内力;最后讨论了线路有载最大阻力在一定范围内变化时,钢轨纵向附加力的分布特征。
关键词: 梁轨相互作用 弹塑性 滞回曲线 加载历程 钢轨纵向附加力
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Rail-Bridge Static Interaction Analyses Considering Loading History
Abstract:This paper develops a rail-bridge static interaction model for a simply supported viaduct metro line, by applying the elastoplastic hysteretic assumption between the longitudinal displacement and resistance of fasteners. Rail-bridge interaction analyses are then conducted considering loading history after the calculating model and related parameters are introduced. The calculation results obtained from the proposed method considering the loading history are then compared with those from the traditional linear superposition method. The characteristics of longitudinal additional forces in the rails is thereafter investiaged under reciprocating loading history. The convergent residual forces are found to exist in the rails under cyclic loading history. Finally, the characteristics of longitudinal additional force in rails are discussed using various maximum loaded resistance of fasteners.
Keywords: rail-bridge interaction elastoplastic hysteretic curve loading history longitudinal additional forces in the rails
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