【摘要】 为研究多年冻土区机车振动荷载作用下桥梁桩基的动力响应特征,选取了多年冻土区清水河特大桥的两个桥梁桩基进行现场强震动测试.对测试数据进行加速度响应及傅里叶谱响应分析,得出桥梁桩基的振动响应衰减规律及振动能量的分布规律.在此基础上,结合有限元结构分析软件,运用瞬态动力分析法,选取一个测试桩为实例进行二维动力响应的数值计算,获得了机车过桥时桥梁桩基的位移响应及应力响应的变化规律.更多还原

【Abstract】 In order to obtain the dynamic response characteristics of bridge pile foundation in permafrost regions under the effect of train vibration loading,strong vibration tests were carried out at two bridge pile foundations across the Qingshuihe River in permafrost region.The attenuation function of vibration response and the vibration energy distribution of the bridge pile foundation were obtained by analyzing the response of acceleration and response of Fourier Spectrum from the test data.On these in-situ test data,the dynamic finite element analysis method of transient dynamic analysis was applied to dynamic response numerical calculation on a test pile,as a case.Thus,the change rules of stress response and displacement response of the bridge pile foundation under the locomotive load are obtained.更多还原