【摘要】 通过数值模拟研究了地震动空间变化对高压输电塔线体系地震反应的影响。建立了输电塔线耦联体系三维有限元模型,考虑了输电线的几何非线性特征;在考虑地震动的行波效应、部分相干效应和局部场地效应以及多维性基础上,依据功率谱密度函数、相干函数和《电力设施抗震设计规范》模拟了空间变化地震动时程;分别研究了地震动空间变化的行波效应、部分相干效应和局部场地效应对输电塔线体系地震反应的影响。研究结果表明,地震动空间变化对输电塔线体系地震反应影响显著,忽略这些因素将会低估结构的反应。因此对于输电线路实际工程的抗震设计,需要考虑地震动空间变化效应的影响。更多还原

【Abstract】 Here,effects of ground motion spatial variation on seismic response of a power transmission tower-line system were studied with numerical simulations.A three-dimensional finite element model for the power transmission tower-line coupled system considering the geometric nonlinearity of transmission line was established.Based on wave passage effect,coherency loss effect,different local site effect and multi-dimensional nature of ground motion,spatially varying ground motion time histories were simulated according to power spectral density function,coherency loss function and Code for Design of Seismic of Electrical Installations.The effects of wave passage,coherency loss and different local site effect on the seismic response of the transmission tower-line system were investigated,respectively.The results showed that the effects of ground motion spatial variation have significant influence on the seismic response of the transmission tower-line system;neglecting these effects may underestimate the response of the structure;the effects of ground motion spatial variation should be considered in seismic design of transmission line practical engineering.更多还原