【摘要】 在有限元软件ABAQUS平台上,编制考虑钢材损伤累积和失效的用户材料子程序,并应用其对钢管拱桁架结构在强震下的动力响应及破坏形态进行研究。结果表明:用户材料子程序具有较高的计算精度;考虑损伤的结构在失效应变由0.2减小到0.05时,其破坏加速度峰值比不考虑损伤时降低7.04%~46.7%;失效应变为0.2、0.15、0.1、0.05时,其破坏加速度峰值、最大节点位移和结构平均应变的比率分别为1∶0.86∶0.73∶0.57、1∶0.76∶0.53∶0.29和1∶0.79∶0.58∶0.35;考虑损伤和不考虑损伤时,结构均发生非对称破坏形态;结构的破坏位置,考虑损伤时在1/3跨附近,不考虑损伤时在1/3跨及跨中附近。更多还原

【Abstract】 The user material subroutine considering the influence of material damage cumulation and failure strain was compiled on the platform of the finite element program ABAQUS.This paper presents the analysis on the dynamic response and failure modes of the arch truss under strong earthquake with the user material subroutine.The results show that the subroutine has good calculating precision;and that when failure strain decreases from 0.2 to 0.05,the failure acceleration amplitudes of the spectrum reduce by 7.04% to 46.7% compared to those not considering damage cumulation;and that the ratio of the acceleration amplitudes,the maximum node displacements and the structure average strains while failure is 1 ∶0.86 ∶0.73 ∶0.57,1 ∶0.76 ∶0.53 ∶0.29 and 1 ∶0.79 ∶0.58 ∶0.35 corresponding to the failure strain of 0.2,0.15,0.1 and 0.05;and that their failure modes are all asymmetric no matter whether damage cumulation is included or not;the failure positions are at 1/3 span of the truss considering material damage cumulation,and are at 1/3 span and near mid-span of the truss not considering material damage cumulation.更多还原