汽车致虎门遗址振动影响数值分析  

Numerical analysis on vibration response of Humen site induced by moving vehicle load

作　　者：常鹏[1] 李强军[1] 马伯涛[2] 付仰强[2] 杨维国[1] 葛家琪[2] 

机构地区：[1]北京交通大学土木建筑工程学院,北京100044 [2]中国航空规划建设发展有限公司,北京100120

出　　处：《振动与冲击》2014年第14期48-53,共6页Journal of Vibration and Shock

基　　金：国家自然科学基金资助项目(51178041);中央高校基本科研业务费专项资金资助项目(2013JBM066);中国航空规划建设发展有限公司资助项目(技12技-1)

摘　　要：以东莞虎门镇威远岛环岛路炮台及兵营遗址为研究对象，建立工程公路-山体-兵营整体三维数值分析模型。采用有限元程序进行动力时程分析，计算炮台、兵营在不同车辆轴重、行驶速度的振动响应，获得加速度、速度沿距离分布规律，分析各因素对遗址振动影响。结果表明，车速由40 km/h 增加到80 km/h 时炮台底座速度响应增加4％～13％，而兵营地基速度响应增加6％～30％；轴重由15 t增加到55 t时炮台底座、兵营地基响应与轴重成正相关增大。通过在震源处施加竖向变频率简谐作用力进行谐响应分析知模型卓越频率分别在10 Hz及40 Hz附近；外部交通振动荷载频率近10 Hz时，炮台底座、兵营地基振动响应最大。Taking the old barracks and the fort relics,situated at Humen,Dongguan,as a dynamic analysis object,a whole 3D model was established for numerical simulation.In order to calculate the structural vibration response caused by a vehicle under different vehicle speeds,and with different axle weights,a time-historical analysis was completed by using finite element method.The vibration acceleration and velocity were investigated and the effect of moving vehicle load on the relics was analyzed.The results show that if the vehicle speed increases from 40km/h to 80 km/h,the velocity response of the fort base increases by 4%~13%;and that of the foundation of barracks increases by 6%~30%.Similarly,if the axle load increases from 15t to 55t,the response of the relics base appears positive correlation with the increasing of axle weight.By changing the frequency of the vertical harmonic force,the harmonic response analysis was achieved.It is shown that the predominant frequencies of the model are close to 10Hz and 40Hz. When the loading frequency is near 10Hz,the vibration response of the foundation of the old barracks and the fort reaches its maximum value.

关 键 词：交通环境振动 遗址保护 车速 轴重 荷载频率 振动响应 

分 类 号：TU311.3[建筑科学—结构工程] TU251