余震对单层网壳结构动力损伤累积效应的影响分析  

Analysis of damage accumulation effect of single-layer latticed shells considering aftershock action

作　　者：李永梅[1,2] 郑文豪[1] 胡琨[1] LI Yong-mei ZHENG Wen-hao HU Kun(Beijing Key Lab of Earthquake Engineering and Structural Retrofit, Beijing University of Technology, Beijing 100124, China The Key Laboratory of Urban Security and Disaster Engineering, Ministry of Education, Beijing University of Technology, Beijing 100124, China)

机构地区：[1]北京工业大学工程抗震与结构诊治北京市重点实验室,北京100124 [2]北京工业大学城市与工程安全减灾省部共建教育部重点实验室,北京100124

出　　处：《空间结构》2016年第4期23-28,共6页Spatial Structures

基　　金：北京市自然科学基金项目(8152008)

摘　　要：为了研究余震作用对单层网壳结构动力性能的影响,基于材料的应变-损伤本构模型,建立考虑地震损伤累积效应的有限元分析模型.运用非线性动力弹塑性分析方法,对一K8型单层网壳结构进行考虑主震和余震共同作用的动力损伤分析.结果表明:当主震为小震、中震或大震时,较小余震作用对结构动力性能影响可以忽略;而主震为强震时,余震对结构动力性能影响显著,结构可能在较小余震作用下发生局部动力失稳或整体倒塌现象.本文成果可为单层网壳结构抗震设计、评估与震后修复提供参考.To study the influence of aftershock action on dynamic property of single-layer latticed shells under earthquake excitation,based on the constructive relationship between strain and damage of materials,finite element analysis model is set up considering the damage accumulative effect of steel material.By means of non-linear dynamic elasto-plastic analysis method,dynamic damage analysis is carried out for a Kiewitt-8type single-layer latticed shell under main earthquake excitation with aftershock action.It is shown that,while aftershock action can be neglected under the action of middle or frequently occurred main earthquake,it can have an obvious influence on the structural dynamic property under the action of severe main earthquake,and it is possible that local dynamic instability or whole collapse will happen to the structure.Results from this study provide a reference for seismic design,repair and assessment for single-layer latticed shells.

关 键 词：单层网壳 余震作用 损伤累积效应 动力损伤分析 

分 类 号：TU393.3[建筑科学—结构工程]