Influence of mortar gap on natural vibration frequencies of high-speed railway track-bridge system

作     者：LIU Shao-hui JIANG Li-zhong ZHOU Wang-bao FENG Yu-lin 刘韶辉;蒋丽忠;周旺保;冯玉林

作者机构：School of Civil EngineeringCentral South UniversityChangsha 410075China National Engineering Research Center of High-speed Railway Construction TechnologyChangsha 410075China School of Civil Engineering and Architecture East China Jiaotong UniversityNanchang 33013China 

出 版 物：《Journal of Central South University》 (中南大学学报（英文版）)

年 卷 期：2022年第29卷第8期

页      面：2807-2819页

核心收录：

学科分类：081406[工学-桥梁与隧道工程] 08[工学] 0814[工学-土木工程] 082301[工学-道路与铁道工程] 0823[工学-交通运输工程] 

基　　金：Projects(U1934207,52078487,51778630) supported by the National Natural Science Foundation of China Project(502501006) supported by the Fundamental Research Funds for the Central Universities,China Project(2019RS3009)supported by the Hunan Innovative Provincial Construction Project,China Projects(HJGZ20211003,HJGZ20212009)supported by State Key Laboratory of Performance Monitoring and Protecting of Rail Transit Infrastructure,China 

主　　题：shear deformation track-bridge system mortar gap vibration frequencies 

摘      要：Based on Hamilton’s principle, the differential equations of free vibration of track-bridge systems with mortar gap are derived. Hence, a method for calculating the natural frequencies of track-bridge systems is proposed. The influence of the flexural stiffness of the track-bridge system, the vertical and longitudinal stiffness of the mortar layer,gap position and gap length on the natural frequencies of a track-bridge system is discussed. The results show that the natural frequencies of the track-bridge system are more sensitive to the change of the flexural stiffness of the bridge layer. The change of the longitudinal stiffness of the mortar layer and gap position has no obvious effect on the trackbridge system’s natural frequencies, while the interlayer vertical stiffness has a larger impact. The gap length has a more significant effect on the 4th-5th order natural frequencies of the track-bridge system. The range of the natural frequencies that are affected by the gap widens as the gap length increases.