冲击作用下钢筋混凝土框架抗连续倒塌数值模拟

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振动与冲击 ›› 2016, Vol. 35 ›› Issue (23) : 56-64.

论文

何庆锋刘义仁周超易伟建

作者信息 +

Numerical Simulation of Progressive Collapse of Reinforced Concrete Frame under Impact Load

He Qing-feng, Liu Yi-ren, Zhou Chao, Yi Wei-jian

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文章历史 +

摘要

为研究冲击作用下钢筋混凝土框架结构的抗连续倒塌性能，本文采用有限元软件LS-DYNA对两个单层、四个三层钢筋混凝土框架在冲击荷载作用下的抗倒塌性能进行了数值模拟分析，计算过程中主要改变了框架梁的纵筋配筋率，对比分析计算了冲击作用下各框架的内力、位移以及破坏过程等。分析结果表明：冲击作用下，各框架梁均经历了明显的拱效应与悬索效应受力阶段，且配筋率越低，拱效应越明显；框架抗倒塌能力与框架梁配筋率有关，配筋率高的楼层承载能力较强，耗能能力较大，框架空腹作用能提高多层框架结构承载能力。基于数值计算结果，分析了框架结构在冲击作用下的抗倒塌能力以及加强措施。

Abstract

In order to study the collapse-resistant behavior of RC frame under impact load, in this paper, a numerical simulation analysis of two 1-story and four 3-story RC frame models under impact load was carried out by using the finite element software LS-DYNA.The major variable in this analysis is longitudinal reinforcement ratio. As is shown in the results, each frame beam has experienced the obvious arch effect and catenary effect under impact load. In addition, the arch effect become more obvious with the decrease of reinforcement ratio. The reinforcement ratio also has an influence on the collapse-resistant behavior of frame, the high reinforcement ratio can result in relatively strong bearing and energy dissipation capacity of the frame, and the vierendeel effect can improve the load bearing capacity of multi-story frame structure. Based on the results of numerical calculation, the collapse-resistant behavior of RC frame was analyzed, and some strengthen measures were proposed accordingly.

导出引用

何庆锋刘义仁周超易伟建. 冲击作用下钢筋混凝土框架抗连续倒塌数值模拟[J]. 振动与冲击, 2016, 35(23): 56-64

He Qing-feng, Liu Yi-ren, Zhou Chao, Yi Wei-jian. Numerical Simulation of Progressive Collapse of Reinforced Concrete Frame under Impact Load[J]. Journal of Vibration and Shock, 2016, 35(23): 56-64

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