多维地震下考虑不同破坏准则的输电塔-线体系倒塌分析

Collapse analysis of transmission tower-line system under multi-dimensional seismic excitation based on different failure criteria

研究了基于不同失效准则多维地震激励下输电塔-线体系的倒塌。根据实际工程,运用ABAQUS有限元分析软件,考虑材料非线性和几何非线性,建立了包含两基输电塔与3跨输电线的大跨越输电塔-线体系三维有限元模型。提出了2种不同的杆件失效准则,采用用户材料子程序,基于动力显式分析方法,研究了大跨越输电塔-线体系在3条典型天然地震波作用下考虑不同失效准则的倒塌机理,并对输电塔的杆件失效、节间位移角以及相对薄弱位置进行了分析。分析结果可以为大跨越输电塔-线体系的抗震设计提供参考。

In this research, the collapse of the transmission tower-line system considering different failure criteria under multi-dimensional seismic excitations was studied. According to the practical engineering, a three-dimensional finite element model of a long span transmission tower-line system was established with the consideration of geometric and material nonlinearities by ABAQUS. The material damage and member buckling effect were adopted in the user material routine. Two element failure criteria were proposed and the collapse mechanism of the long span transmission tower-line system under three typical natural seismic excitations was investigated considering different failure criteria, respectively. The member instability, inter-segment displacement ratio and weak position of the transmission tower were studied. The analysis results could provide a reference for the seismic design of the long span transmission tower-line system.