机车荷载下多年冻土区桥梁桩基振动响应特征  

Characteristics of Vibration Response of Bridge Pile Foundation in Permafrost Regions under Locomotive Loading

作　　者：霍元坤[1,2] 吴志坚[2,3] 陈拓[2] 马巍[4] 

机构地区：[1]兰州交通大学土木工程学院,甘肃兰州730070 [2]中国地震局兰州地震研究所黄土地震工程开放实验室,甘肃兰州730000 [3]中国地震局黄土地震工程开放实验室,甘肃兰州730000 [4]中国科学院寒区旱区环境与工程研究所冻土工程国家重点实验室,甘肃兰州730000

出　　处：《冰川冻土》2011年第4期908-913,共6页Journal of Glaciology and Geocryology

基　　金：国家自然科学基金项目(40902094);中国地震局地震预测研究所基本科研业务费项目(2010A76);中国科学院西部行动计划(二期)项目(KZCX2-XB2-10);中国科学院冻土工程国家重点实验室开放基金项目(SKLFSE200801)资助

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.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.

关 键 词：青藏铁路 桥梁 振动传递 动力响应 

分 类 号：U441.3[建筑科学—桥梁与隧道工程]