隔震结构在地下室内爆炸荷载作用下的连续倒塌模拟

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英文篇名：Simulation of uninterrupted collapse isolated structure under blast load in basement 作者：杜永峰 ; 曾晓虹 英文作者：DU Yong-feng;ZENG Xiao-hong;Institute of Earthquake Protection Mitigation,Lanzhou Univ. of Tech.;Western Research Center of Disaster Prevention and Mitigation in Civil Engineering, the Ministry of Education,Lanzhou Univ. of Tech.; 关键词：隔震结构 ; 连续倒塌 ; 爆炸荷载 ; 流固耦合 ; 初始损伤 英文关键词：isolation structure;;uninterrupted collapse;;blast load;;fluid-solid coupling;;initial damage 中文刊名：GSGY 英文刊名：Journal of Lanzhou University of Technology 机构：兰州理工大学防震减灾研究所;兰州理工大学西部土木工程防灾减灾教育部工程研究中心; 出版日期：2019-04-25 18:22 出版单位：兰州理工大学学报 年：2019 期：v.45;No.196 基金：国家自然科学基金(51178211,51578274) 语种：中文; 页：GSGY201902020 页数：8 CN：02 ISSN：62-1180/N 分类号：119-126

摘要

为了探究隔震结构在地下室内发生爆炸时的连续倒塌模式和机理,采用LS-DYNA软件建立一个地下1层、地上4层的钢筋混凝土框架隔震结构整体式模型;通过流固耦合方法分别模拟地下室内部不同位置处爆炸荷载作用下隔震结构的破坏及连续倒塌全过程;对比分析不同位置柱及其上隔震支座失效时隔震结构的连续倒塌程度和倒塌模式,并阐释产生不同倒塌模式的原因.结果表明:在炸药当量相同的情况下,对不同位置目标柱及柱顶隔震支座施加爆炸荷载后,结构发生连续倒塌的主要原因都是目标构件失效后相邻构件的初始损伤导致传力路径失效,其初始损伤程度是影响结构倒塌规模的关键因素;因此,在结构爆炸分析中,备用荷载路径法得到的结果偏于不安全.
        In order to study the mode and mechanism of uninterrupted collapse of isolated structure under blast load in the basement, the software LS-DYNA was used to establish an integrated model of reinforced concrete framed isolated structure with one storey above ground and four storeys under ground. The entire process of damage of isolated structure and its uninterrupted collapse in different blast load positions of basement was respectively simulated with fluid-solid coupling method. The degree and mode of uninterrupted collapse of the isolated structure in the case of failure of target column and its upper isolation bearing at different positions were compared and analyzed, and the reasons of collapse with different mode were explained. The result showed that: In the case of identical explosive equivalent, the main reason of uninterrupted collapse of structure would be that the initial damage of the adjacent component of the failed target component would lead to the failure of force transmission path. The initial damage degree of the surrounding components would be the key factor affecting the uninterrupted collapse of the structure. In structural explosion analysis, the result obtained with alternate load path method would be not safe enough.

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