SMART-1台阵地震动激励下输电塔线体系反应分析

RESPONSE ANALYSIS OF TRANSMISSION TOWER-LINE SYSTEM UNDER SMART-1 SEISMIC GROUND MOTION EXCITATION

该文研究了SMART-1台阵多维多点地震激励下输电塔-线体系的反应。根据输电线路实际工程,在考虑输电线的几何非线性基础上,建立了输电塔-线耦联体系的三维有限元计算模型。选取了SMART-1台阵中不同方向上的多维多点地震动时程,分别研究了不同折线角度下输电塔线体系多维一致和多维多点地震反应。研究结果表明:不同夹角下输电塔-线体系在多维多点激励下的反应均大于多维一致激励下的反应,但随着角度不同,增大程度也不同,尤其是输电线的竖向位移得到了强烈的放大。通过实际的多维多点地震动研究了输电线路不同角度下的反应,对应角度不同,输电线路受地震动多维多点效应影响不同。所获得的分析结果可为输电线路抗震设计提供参考。

The responses of a transmission tower-line system under multi-component multi-support excitations of SMART-1 seismic array are investigated. A three-dimensional finite element model of a transmission tower-line coupled system considering the geometric nonlinearity of a transmission line is established based on a practical engineering project. The multi-component multi-support seismic time history of SMART-1 seismic array is selected, and the responses of a transmission tower-line system with different unfold type angles under multi-component uniform and multi-component multi-support excitations are studied, respectively. The results show that the responses of a transmission tower-line system under multi-component multi-support excitations are larger than those under multi-component uniform excitations, but the increasing degrees vary with the change of angles, especially the vertical displacement of a transmission line is strongly amplified. The response of a transmission line is studied with different angles according to real multi-component multi-support seismic waves, and the multi-component multi-support earthquakes have different influences on a transmission line with different angles. The analysis results obtained could provide a reference for the aseismic design of transmission lines.