强震下钢管拱桁架损伤及失效机理研究  

Study on damage and failure mechanism of steel pipe arch truss under strong earthquake

作　　者：刘静[1] 李海旺[1] 刘国良 树学峰[1] 

机构地区：[1]太原理工大学,山西太原030024 [2]天津长城建筑设计有限公司,天津300041

出　　处：《土木工程学报》2010年第S1期142-147,共6页China Civil Engineering Journal

基　　金：国家自然科学基金(50878137);山西省科技攻关项目(20080321086);山西省归国留学基金(2009-26)

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。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.

关 键 词：钢管拱桁架 强烈地震 损伤累积 失效机理 失效应变 

分 类 号：TU392.3[建筑科学—结构工程] TU311.3