多维地震激励下考虑构件滞回性能的输电塔倒塌分析

本文基于角钢新型非线性材料本构模型对多维地震激励下输电塔倒塌破坏进行模拟研究。基于ABAQUS中RIKS算法得到不同长细比角钢的屈曲承载力,并通过承载力试验验证有限元分析结果。基于角钢滞回性能试验结果,采用Fortran语言编制角钢新型非线性材料本构模型,并与试验结果对比。建立输电塔三维有限元模型,采用动力显式分析方法,对多维地震激励下输电塔倒塌进行模拟,总结输电塔的极限承载力、杆件屈曲情况和倒塌位置。研究结果可为多维地震激励下输电塔抗倒塌设计提供参考。

Collapse Analysis of Transmission Towers under Multi-dimensionalSeismic Excitation Considering Hysteretic Behavior of Components

Based on a novel, nonlinear material constitutive model of angle steel, the collapse mechanism of transmission towers subjected to multi-dimensional seismic excitation was simulated in this paper. Buckling capacities of angle steels with different slenderness ratios were investigated by the RIKS algorithm in ABAQUS, and the finite element analysis results were verified by bearing capacity tests. Based on the hysteretic property test results, a new nonlinear material constitutive model of angle steel was developed and verified using Fortran programming language. A three-dimensional finite element model of the transmission tower was then established, and collapse of the transmission tower under multi-dimensional seismic excitation was simulated. Ultimate bearing capacity, buckling of members, and collapse locations of the transmission tower were investigated by dynamic explicit analysis. Research results can provide a theoretical guidance for the seismic design of transmission towers under multi-dimensional seismic excitation.