| 不对称跨度下钢框架组合梁柱子结构抗倒塌能力分析 |
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| 引用本文： | 钟炜辉,谭政,宋晓燕,孟宝.不对称跨度下钢框架组合梁柱子结构抗倒塌能力分析[J].振动与冲击,2020,39(13):260-266. |
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| 作者姓名： | 钟炜辉 谭政 宋晓燕 孟宝 |
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| 作者单位： | 1.西安建筑科技大学土木工程学院，西安710055；
2.西安建筑科技大学结构工程与抗震教育部重点实验室，西安710055 |
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| 摘 要： | 基于备用荷载路径法,在充分考虑楼板组合效应的基础上,以不等跨组合梁柱子结构为研究对象,提出了双跨组合梁在集中荷载作用下的显式简化模型,详细推导了其在连续倒塌过程中5个不同性态阶段(弹性阶段、弹塑性阶段、塑性阶段、过渡阶段及悬链线阶段)的承载力-位移相关计算公式,重点分析了组合梁柱子结构的抗连续倒塌机制。通过ABAQUS建立了相关数值分析模型,对理论公式进行了针对跨度比差异的数值模拟对比,结果表明理论公式对不对称跨度组合梁柱子结构连续倒塌分析具有良好的通用性和较高的计算精度。
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| 关 键 词： | 组合梁柱子结构 连续倒塌 不对称跨度 抗倒塌机制 理论公式 |
Anti-collapse capacity analysis for a steel frame composite beam-column substructure with asymmetric span |
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| ZHONG Weihui,TAN Zheng,SONG Xiaoyan,MENG Bao.Anti-collapse capacity analysis for a steel frame composite beam-column substructure with asymmetric span[J].Journal of Vibration and Shock,2020,39(13):260-266. |
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| Authors: | ZHONG Weihui TAN Zheng SONG Xiaoyan MENG Bao |
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| Affiliation: | 1. School of Civil Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China；
2. MOE Key Lab of Structural Engineering and Earthquake Resistance, Xi’an University of Architecture and Technology, Xi’an 710055, China |
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| Abstract: | Based on the alternate load path method and fully considering composite effect of floor slab, a composite beam-column substructure with unequal span was taken as the study object to propose an explicit simplified model of a double-span composite beam under concentrated load. The formulas for the substructure’s load-displacement calculation in five different stages including elastic stage, elastic-plastic one, plastic one, transition one and catenary one during its continuous collapse were derived in detail. The anti-collapse mechanism of the composite beam-column substructure was emphatically analyzed. Its numerical analysis model was established using the finite element software ABAQUS, the calculation results using the theoretical formulas were compared with those using numerical simulation analysis under different span ratios. Results showed that the theoretical formulas derived here have a good generality and a higher calculation accuracy for continuous collapse analysis of composite beam-column substructure with asymmetric span. |
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| Keywords: | composite beam-column substructure continuous collapse asymmetric span anti-collapse mechanism theoretical formula |
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