建筑结构学报2025，Vol.46Issue(3)：117-129,13.DOI:10.14006/j.jzjgxb.2024.0245
不对称跨度多层钢框架抗倒塌性能试验研究
Experimental study on anti-collapse performance of multi-story steel frames with asymmetric spans
摘要
Abstract
To investigate the effect of span ratios of double-span beams connected to the failed column on the anti-collapse performance of multi-story steel frames,static loading tests were conducted on three-story steel sub-frames with different span ratios(4/3,1 and 2/3)under the middle column removal scenario,aiming to reveal the effects of asymmetric span on the collapse behavior of multi-story sub-frames.The contributions of different mechanism resistances were quantitatively separated by the energy conversion principle.The dynamic response curves and dynamic amplification factors of the asymmetric-span single-story beam-column assemblies and multi-story sub-frames were compared and discussed.The results indicate that as the span ratio increases,the maximum load at the flexural mechanism stage of the frames decreases continuously.The maximum load of the asymmetric-span frames is both recorded at the flexural mechanism stage,whereas for the asymmetric-span frame,the maximum load appears at the final failure position owing to the synergistic action of the double-span beams.The contribution of the flexural mechanism resistance for the three frames ranges from 70％to 80％,while the contribution of the catenary resistance accounts for 20％～30％.Specifically,the resistance contribution of the second-story beams is approximately 35％,and the contributions of the first-and third-story beams are approximately 41％and 24％,respectively.关键词
连续倒塌/不对称跨度/多层框架结构/静力试验/动力响应Key words
progressive collapse/asymmetric span/multi-story frame structure/static test/dynamic response分类
建筑与水利引用本文复制引用
谭政,钟炜辉,高垚,段仕超,曲泽宇,孟宝..不对称跨度多层钢框架抗倒塌性能试验研究[J].建筑结构学报,2025,46(3):117-129,13.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),国家自然科学基金面上项目(51678476). （52408211）
