钢支撑加固钢框架抗连续倒塌设计研究及分析  

Design research and analysis of steel frame structure withsteel brace against progressive collapse

作　　者：孙海峰 黑晓丹 张勤生 胡隆德 夏远洋 SUN Haifeng;HEI Xiaodan;ZHANG Qinsheng;HU Longde;XIA Yuanyang(Technology and Design Management Department,Northwest Design and Research Institute of China Municipal Engineering Co.,Ltd.,Lanzhou 730030,China;China Municipal Engineering Northwest Design and Research Institute Limited Architectural Design Institute,Lanzhou 730030,China;China Municipal Engineering Northwest Design and Research Institute Limited Company Sixth Design Institute,Lanzhou 730030,China)

机构地区：[1]中国市政工程西北设计研究院有限公司科技与设计管理部,甘肃兰州730030 [2]中国市政工程西北设计研究院有限公司建筑设计院,甘肃兰州730030 [3]中国市政工程西北设计研究院有限公司第六设计院,甘肃兰州730030

出　　处：《甘肃科学学报》2025年第1期60-68,共9页Journal of Gansu Sciences

基　　金：甘肃省企业技术创新项目(GXHQY20240328-5);中国市政工程西北设计研究院有限公司科技计划(XBSZKY2320,XBSZKY2405)。

摘　　要：为研究钢结构抗连续倒塌加固设计方法,建立纤维梁-分层壳数值模型,采用增量动力分析法分别计算设计结构首层6个单柱拆除后结构极限荷载和拆除单柱及其相邻柱的极限荷载,使用本文给出的钢支撑抗连续倒塌设计方法计算得到钢支撑加固抗连续倒塌加固设计荷载,假定支撑与框架对结构抗连续倒塌的贡献独立,计算设计钢支撑截面。分别建立倒V形、V形、偏心形和X形钢支撑框架,研究了不同支撑类型对钢框架抗连续倒塌能力的影响。结果表明,拆除Ⅱ柱最容易发生连续倒塌,拆除Ⅳ柱最不易发生连续倒塌,同时拆除Ⅲ-Ⅱ柱最容易发生连续倒塌,同时拆除Ⅵ-Ⅹ柱最不易发生连续倒塌;本文提出的钢支撑加固设计方法可靠;倒V形、V形、偏心形和X形钢支撑均可提高结构抗连续倒塌能力、极限承载力和刚度,倒V形支撑对减小CRP位移效果最好,其次是X形、偏心形和V形。In order to investigate the reinforcement design method for steel structures against progressive collapse,a numerical model of fiber beam-layered shell was established.The ultimate load of the structure after removing the six single columns from the first layer,the ultimate load of each single column and its adjacent columns were calculated using incremental dynamic analysis.The design load for steel support against progressive collapse was determined based on the proposed method in this study.Assuming independent contributions of support and frame to structural progressive collapse,the design cross-section for steel support was computed.Inverted V-shape,V-shape,eccentric,and X-shape steel support frames were individually established to study their influence on the ability of steel frames to resist progressive collapse.Results indicate that columnⅡis most susceptible to progressive collapse while column IV is least susceptible;columnsⅢ-Ⅱare more prone than columnsⅥ-Ⅹ.Therefore,the proposed steel support reinforcement design method in this paper is reliable.Inverted V-shape,V-shape,eccentric and X-shape bracing all enhance resistance against progressive collapse as well as ultimate bearing capacity and stiffness of the structure.Among these types,inverted V-shape bracing has shown superior effectiveness in reducing CRP displacement followed by X-shape,eccentric-shape and V-shape.

关 键 词：增量动力分析法 极限荷载 设计荷载 钢支撑抗连续倒塌设计 支撑形式 

分 类 号：TP391[自动化与计算机技术—计算机应用技术] TP317.1[自动化与计算机技术—计算机科学与技术]