考虑加载历程和梁轨相互作用的桥上轨道受力分析  

Analysis on Stress of Track on Bridge Considering Loading History and Track-bridge Interaction

作　　者：石龙[1] 吴定俊[2] 李奇[2] 

机构地区：[1]中国铁道科学研究院铁道建筑研究所,北京100081 [2]同济大学桥梁工程系,上海200092

出　　处：《铁道学报》2016年第2期105-111,共7页Journal of the China Railway Society

基　　金：国家自然科学基金(51278374)

摘　　要：本文基于扣件纵向位移阻力弹塑性滞回模型,建立城市轨道交通简支高架桥与钢轨相互作用模型,进行考虑加载历程的梁轨相互作用研究。选定计算使用的模型及相关参数后,比较使用考虑加载历程方法与传统线性叠加方法所得钢轨纵向附加力的差异,分析往复荷载作用下钢轨纵向附加力的特点,以及线路最大有载阻力在一定范围内变化时钢轨纵向附加力的分布特征。研究结果表明钢轨在循环荷载作用下存在收敛的残余内力。A track-bridge static interaction model was developed for a simply supported viaduct metro line,using an elastoplastic hysteretic assumption for the longitudinal resistance-displacement relationship of fasteners.A study on track-bridge interaction was then conducted considering load history effects.After the model and the related parameters used for the calculation were determined,the calculation results obtained from the proposed method considering loading history were then compared with those from the traditional linear superposition method,to investigate the characteristics of longitudinal additional forces in the rails under reciprocating load.Finally,the characteristics of the distribution of the longitudinal additional force in the rails were analyzed when the maximum load resistance of the line varied in a certain range.The convergent residual forces were found to exist in the rails under cyclic loading.

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 

分 类 号：U213.212[交通运输工程—道路与铁道工程]