近断层地震动作用下输电塔-导线体系反应分析  

Response of power transmission tower-cable system subjected to near-fault ground motions

作　　者：岳茂光[1] 王东升[2] 李宏男[1] 翟桐[3] 

机构地区：[1]大连理工大学海岸及近海工程国家重点实验室,辽宁大连116023 [2]大连海事大学道路与桥梁工程研究所,辽宁大连116026 [3]中国地震局工程力学研究所,黑龙江哈尔滨150080

出　　处：《地震工程与工程振动》2005年第4期116-125,共10页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金项目(59978025);中国地震局"十五"重点项目

摘　　要：首先在考虑了导线的几何非线性基础上,建立了输电塔-导线体系的简化空间有限元分析模型。其次对体系按纵向和侧向分别进行了自振特性分析。最后在近断层地震动、人造波和E l Centro波作用下,利用非线性时程分析法研究了体系的地震反应特性。文中给出的输电塔的计算结果表明:(1)导线明显增加了输电塔的纵向基本自振周期,而对侧向振动周期几乎没有影响;(2)近断层地震动和其它地震动作用相比,输电塔的反应相差不大;(3)近断层地震动显著增大了导线的位移反应,尤其是侧向;(4)导线对体系纵向地震反应影响较大,对侧向地震反应影响较小。Taking account of the cable＇s geometric nonlinearity, the simplified spatial finite element analysis model of the power transmission tower-cable system is established, and then the dynamic characteristic analysis of the system is carried out from the longitudinal and lateral direction respectively. Response of the system under the excitations of the artificial ground motions, near-fauh ground motions and EI Centro ground motion is studied by using nonlinear time-history analysis. The results of the tower given in this paper indicate that （ 1 ） the cable obviously increases the tower＇s fundamental period in longitudinal direction, while the effect on the lateral vibration period can be neglected; （2） the difference of the tower＇s response between near-fault ground motions and other far-field ground motions is not large; （3） the cable＇s displacement is increased sharply when subjected to the near-fauh ground motions especially in lateral direction; （4） the cable has a more strong influence on the longitudinal seismic response of the system than the lateral one.

关 键 词：输电塔-导线体系 几何非线性 自振特性 地震反应 近断层地震动 

分 类 号：P315.9[天文地球—地震学] U442[天文地球—固体地球物理学]