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依据工程实际资料,建立了“两塔三线”大跨越输电塔-线体系三维有限元模型,并进行了动力特性分析。选取了3条天然地震波El Centro、Taft和Northridge,并依据Arias强度定义了70%持时地震动和90%持时地震动,采用考虑材料损伤和杆件失稳效应的用户材料子程序,利用动力显式分析方法,研究了强震持时效应对大跨越输电塔-线体系杆件损伤程度、损伤杆件数量以及结构倒塌的影响。研究表明:强震持时效应对结构损伤杆件数量、杆件损伤程度以及结构倒塌有较大的影响;研究结果对于地震作用下输电塔-线体系工作性能的评估以及维修加固具有重要的意义。
Based on the actual engineering data, a three-dimensional finite element model of “two towers and three lines” long-span transmission tower-line system was established and its dynamic characteristics were analyzed. Three natural seismic waves, El Centro, Taft and Northridge, were selected and 70% of the time-dependent ground motions and 90% of the time-dependent ground motions were defined according to the strength of Arias. The user material subroutines which considered material damage and bar instability were used. Dynamic explicit analysis method was used to study the effect of strong time-holding effect on the damage degree, the number of damaged bars and the structural collapse of large-span power transmission tower-line system. The results show that the strong time-dependent effect of the strong earthquake has a great influence on the number of structural members, the degree of structural damage and the structural collapse. The research results are of great significance for the evaluation of the working performance of the transmission tower-line system under seismic action and for the maintenance and reinforcement.