【摘要】 考虑地震波以有限波速传播时所引起的地震行波效应及场地相干效应,基于建立的某大跨输电塔线体系空间有限元模型,在7度竖向地震作用下,采用考虑几何非线性的动力时程分析法,研究了该体系在竖向多点地震作用下的动力时程响应特性,并和一致激励下的响应情况进行比较。结果表明:竖向地震能明显增大绝缘子的内力,但对导线内力影响不大;多点激励对导地线及绝缘子的内力响应影响都很小,基本可以忽略。更多还原

【Abstract】 Considering the effect of spatial variation of earthquake ground motion,based on the established finite element model of the lager-span transmission tower-line system,the vertical seismic responses of the systems are studied,which are analyzed by using the dynamic time history integration method under multi-support excitations considering the geometric nonlinearity.The seismic responses of the conductor and insulator are acquired under uniform and multi-support excitations.The results show that the vertical earthquake obviously increase the axial force of the insulators although the effects of vertical earthquake on conductor are slight,and the effects of spatial variation of earthquake on axial force of the conductors and insulators are slight and can be ignored.更多还原