平面钢框架在撞击荷载作用下的抗连续倒塌分析

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摘要各种自然灾害和人为因素都可能造成结构连续倒塌，抗连续倒塌研究经常抛开引起倒塌破坏的原因，直接拆除关键柱，研究剩余结构的抗倒塌性能。本文以平面框架受撞击荷载为例分析具体灾害对框架结构抗倒塌性能的影响，提出一种撞击力简化模型，分析结构体系对撞击力的激励反应，并将撞击拆柱法模拟结果与传统直接拆柱法结果对比，分析两种方法对结构破坏模式与动力性能的影响，然后研究不同质量、速度、能量的撞击块对框架结构撞击后的响应。研究结果表明撞击拆柱法使节点应力分布复杂，引起相邻节点和构件损伤，使关键柱失效后剩余结构的受力方式和破坏模式发生变化，而传统直接拆柱法低估了剩余结构的动力响应；另外，框架结构的动力特性与撞击能量密切相关，特别受撞击速度影响最大。

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	乔惠云1
	2
	郭壮壮1
	陈誉2
	张明锋3
	丘华生4
	王征5

关键词 ：连续性倒塌, 多层框架结构, 直接拆柱法, 撞击拆柱法, 动力效应

Abstract：Many natural disasters and man-made factors may cause the progressive collapse of structures. The research on anti-progressive collapse usually puts aside the causes of collapse and directly demolishes the key columns to study the anti-collapse performance of the remaining structure. In this paper, the plane steel frame subjected to impact load was taken as an example to analyze the specific anti-collapse performance of the frame structure. A simplified impact force model was proposed to analyze the excitation response of the structural system to the impact force. The simulation results of the impact column removal method were compared with those of the traditional direct column removal method, and the influences of the two methods on the failure mode and dynamic performance were analyzed and then the impact responses of the impact blocks with different mass, velocity and energy to the frame structure were studied. The results show that the impact column removal method makes the joint stress distribution complex, causes damage to adjacent joints and components, and changes the stress and failure mode，while the traditional direct column removal method underestimates the dynamic response of the remaining structure; in addition, the dynamic characteristics of frame structure are closely related to the impact energy, especially the impact velocity.

Key words： progressive collapse multi-story frame structure direct column removal method impact column removal method impact load

收稿日期: 2020-12-04 出版日期: 2022-02-28

引用本文:

乔惠云1, 2，郭壮壮1，陈誉2，张明锋3，丘华生4，王征5. 平面钢框架在撞击荷载作用下的抗连续倒塌分析[J]. 振动与冲击, 2022, 41(4): 176-184.
QIAO Huiyun1,2,GUO Zhuangzhuang1,CHEN Yu2,ZHANG Mingfeng3,QIU Huasheng4,WANG Zheng5. Anti-progressive collapse analysis for plane steel frame under impact load. JOURNAL OF VIBRATION AND SHOCK, 2022, 41(4): 176-184.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2022/V41/I4/176

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