列车移动荷载作用下路基的地震反应特性  

Seismic Response Characteristics of Subgrade Under the Train Moving Load

作　　者：高盟[1,2] 李建端 徐晓 陈青生[3] GAO Meng;LI Jianduan;XU Xiao;CHEN Qingsheng(Key Laboratory of Civil Engineering Disaster Prevention and Mitigation,Shandong University of Science and Technology,Qingdao 266590,China;College of Civil Engineering and Architecture,Shandong University of Science and Technology,Qingdao 266590,China;Department of Civil and Environmental Engineering,National University of Singapore,Singapore 119077,Singapore)

机构地区：[1]山东科技大学山东省土木工程防灾减灾重点实验室,青岛266590 [2]山东科技大学土木工程与建筑学院,青岛266590 [3]新加坡国立大学土木与环境工程系,新加坡119077

出　　处：《北京工业大学学报》2022年第1期52-57,共6页Journal of Beijing University of Technology

基　　金：国家自然科学基金资助项目(51978510);山东省自然科学基金资助项目(ZR201702160391)。

摘　　要：为保证地震发生时列车在轨运行的安全性,基于ABAQUS软件和FORTRAN语言,建立高速铁路无砟轨道-路基-地基三维数值分析模型,分析地震-列车移动荷载作用下的弹性均质路基的动力响应规律.地震波Imperial Valley从模型底部双向输入,列车移动荷载的施加通过编制FORTRAN子程序实现.在不考虑轨道不平顺及轮轨关系的情况下,对地震发生时路基在不同列车时速下的动位移、加速度、频谱进行数值计算,结果表明:在地震荷载和移动荷载共同作用下,路基竖向正位移受地震荷载的作用比较显著,而其加速度和频谱受移动荷载的影响更为突出;路基在该复合双荷载作用下的临界速度为70 m/s(252 km/h).To ensure the security of the train running on the track during an earthquake,based on the method of ABAQUS software and FORTRAN language,a three-dimensional numerical analysis model was established for ballast-less track-subgrade-foundation of high-speed railway in this paper,the dynamic response law of elastic homogeneous subgrade caused by seismic-train moving load was analyzed.The Imperial Valley seismic wave was input bidirectionally from the bottom of the model,and the FORTRAN subroutine was compiled to implement the train moving load.In the condition of ignoring the influence of track irregularity and wheel-rail relationship,numerical calculations were implemented including the dynamic displacement,acceleration,and frequency spectrum of the subgrade at different train speeds under the combined action of the seismic and moving load,which shows that when the seismic and train moving load acts together,the vertical positive displacement of the subgrade is significantly affected by the seismic load.Its acceleration and frequency spectrum are more prominently affected by the moving load,and the critical speed of the subgrade under the combined dual load is 70 m/s(252 km/h).

关 键 词：地震荷载 移动荷载 高速铁路 动力响应 加速度频谱 临界速度 

分 类 号：TU311.3[建筑科学—结构工程] TU352.1