建筑结构学报2025，Vol.46Issue(2)：24-38,15.DOI:10.14006/j.jzjgxb.2023.0634
考虑边界约束的多层组合框架抗倒塌性能研究
Investigation on anti-collapse performance of multi-story composite frame considering boundary constraints
摘要
Abstract
To accurately reflect the anti-collapse performance of multi-story composite frame structures under middle column removal scenario,a horizontal loading device considering the peripheral constraint stiffness was design.Through static loading,the resistance response,failure mode,internal force distribution,and mechanism resistance development of a 1/3 scaled three-story composite sub-frame specimen were investigated.The experimental results indicate that the boundary constraint device effectively reflects the decreasing axial constraint stiffness at the extended beams of each story.The axial forces in the beams of each story exhibit an uneven distribution characteristic,resulting in that the contribution of resistance supplied by the first-story to third-story accounts for 43％,37％and 20％of the total resistance,respectively.The presence of the vierendeel action mainly influences the development of catenary mechanism,whereas its influence on flexural mechanism resistance is relatively small.The effects of elastic boundary constraints,failure column positions,and span numbers on the collapse behavior of multi-story frame structures were investigated using numerical analysis methods.The analysis results indicate that the elastic boundary constraints overestimate the structural later resistance.The resistances provided by lower stories continuously decreases as the failed column position moves outward,while the resistance provided by the upper story continuously increases.With an increasing number of beam spans,the axial tension force is continuously transferred to the upper stories,and the resistant contribution provided by each story beam tends to be consistent.关键词
多层组合框架/连续倒塌/静力试验/数值模拟/边界约束Key words
multi-story composite frame/progressive collapse/static test/numerical simulation/boundary constraint分类
土木建筑引用本文复制引用
谭政,钟炜辉,郑玉辉,孟宝,段仕超,张驰,王洪臣..考虑边界约束的多层组合框架抗倒塌性能研究[J].建筑结构学报,2025,46(2):24-38,15.基金项目
国家自然科学基金青年项目(52408211),中国博士后科学基金面上资助项目(2024MD764004),陕西省教育厅重点科学研究计划协同创新中心项目(20JY033),陕西省自然科学基金基础研究计划(2022JQ-381). （52408211）
