列车荷载作用下矮塔斜拉桥索梁振动的相关性  

Cable-Beam Vibration Correlation of Railway Low-Pylon Cable-Stayed Bridge Subjected to Train Load

作　　者：李小珍[1] 刘桢杰 辛莉峰 刘德军[1] 

机构地区：[1]西南交通大学土木工程学院,四川成都610031

出　　处：《西南交通大学学报》2015年第5期817-822,844,共7页Journal of Southwest Jiaotong University

基　　金：国家自然科学基金资助项目(U1434205);国家973计划资助项目(2013CB036301);中央高校基本科研业务费专项资金资助项目(SWJTU12BR037);中国铁路总公司科技研究开发计划项目(2013G001-A-1)

摘　　要：为探讨不同列车速度下矮塔斜拉桥斜拉索振动与桥梁整体振动之间的相关性,基于列车-线路-桥梁耦合振动理论与动力学模型,以某主跨115 m＋95 m的铁路矮塔斜拉桥为工程背景,考虑斜拉索与桥梁整体结构之间的相互作用,通过数值积分得到梁体、桥塔振动响应以及斜拉索局部振动响应.结果表明：列车荷载作用下索梁振动相关性问题实质上是一个能量传递过程,当拉索端点位移激励频率与其自振频率接近时,能量易于在索梁间传递;当列车以225~350 km/h的设计时速通过桥梁、列车荷载的激励频率与斜拉索自振频率接近时,斜拉索在外激励作用下会产生共振,但共振幅值不大（斜拉索局部振动幅值小于3 mm）.In order to investigate the vibration correlation of a low-pylon cable-stayed bridge and its cable components under different running speeds,the interaction between the whole structure and its cables was considered by taking a railway low-pylon cable-stayed bridge with a main span of 115 m ＋95 m as an engineering background,and the vibration responses of beams and towers and the local vibration responses of cables were obtained with the method of numerical integration based on the traintrack-bridge coupling vibration theory. The research result indicates that the cable-beam vibration correlation under a train load is essentially an energy transfer process. The vibration energy transfers easily in the condition that the frequency of displacement excitation at cable end is close to the nature frequency of cables. When a train is passing through a bridge at a design speed of 225 to 350 km / h and the excitation frequency is close to the nature frequency of cables,the resonance of cables will occur under external excitation,but the resonant amplitudes are not great,local vibration amplitudes of cables being less than 3 mm.

关 键 词：铁路矮塔斜拉桥 列车-线路-桥梁耦合振动 索梁振动相关性 

分 类 号：U24[交通运输工程—道路与铁道工程] TB123[理学—工程力学]