高速铁路32 m简支梁振动能量传递规律

Vibration Energy Transfer Laws of 32 m Simply Supported Girder of High Speed Railway

随着列车运行速度的提高,车致振动能量显著增加。本文以高速铁路32 m简支梁为研究对象,通过车-线-桥耦合动力分析,研究振动能量在钢轨、轨道板、底座板、梁体间的传递规律,提出更高速度条件下的桥面板动力系数。结果表明:钢轨振动能量占比在2%以内,轨道板能量占比为10%~20%,底座板能量占比为15%~35%;桥梁刚度对系统能量流传递具有显著影响,主要通过影响结构的共振速度而影响系统能量流的传递;轨道板结构形式主要影响轨道板和底座板之间的能量占比,CRTSⅢ型轨道板系统中的轨道板能量占比明显小于CRTSⅠ型和CRTSⅡ型轨道板;为保证时速440 km范围内运营列车作用下的桥面板动效应不超过设计荷载作用下桥面板动效应,采用CRTSⅠ型、CRTSⅡ型、CRTSⅢ型轨道板的高速铁路简支梁桥面板动力系数分别为1.22、1.18、1.10。

With the increase of train speed,the vehicle-induced vibration energy increases significantly,and it is particularly important to clarify its transmission law between bridge-track subsystems.Taking a 32 m simply supported girder of high speed railway as the research object,through the vehicle-line-bridge coupling dynamic analysis,the transmission laws of vibration energy between rail,track plate,base plate and girder body were analyzed,and the dynamic coefficient of bridge deck under higher speed condition was proposed.The results show that the proportion of rail vibration energy is about 2%,the proportion of track plate energy is about 10%~20%,and the proportion of base plate energy is about 15%~35%.The bridge stiffness has a significant influence on the energy flow transfer of the system,which mainly affects the energy flow transfer of the system by affecting the resonance velocity of the structure.The structure type of the track slab mainly affects the energy ratio between the track slab and the base slab.The energy ratio of the track slab in the CRTSⅢtrack system is significantly smaller than that of the CRTSⅠand CRTSⅡtrack slabs.In order to ensure that the dynamic effect of the bridge deck under the action of the operating train in the range of 440 km/h does not exceed the dynamic effect of the bridge deck under the design load,the dynamic coefficients of the high speed railway simply supported girder bridge deck with CRTSⅠ,CRTSⅡand CRTSⅢtrack slabs are 1.22,1.18 and 1.10,respectively.