爆炸荷载作用下RC梁-板子结构抗连续倒塌动力效应研究

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振动与冲击 ›› 2023, Vol. 42 ›› Issue (9) : 27-35.

论文

李治1,2，原小兰2，董腾方2，黄茜3，邓小芳1,2

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Anti-progressive collapse dynamic effect of RC beam-slab substructure under blast load

LI Zhi1,2, YUAN Xiaolan2, DONG Tengfang2, HUANG Xi3,DENG Xiaofang1,2

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摘要

为研究爆炸荷载作用下建筑结构的抗连续倒塌性能。本文通过ANSYS/LS-DYNA有限元软件对爆炸荷载作用下钢筋混凝土(reinforced concrete，RC)梁-板子结构的抗连续倒塌动力效应进行研究，并对混凝土强度、钢筋配筋率和跨高比等参数进行拓展分析。研究结果表明：通过瞬间去柱模拟爆炸去柱会造成结构残余承载力和结构局部损伤程度偏于保守或者偏高的后果。混凝土强度对结构的动力效应影响显著，当混凝土强度大于C40时，结构的压膜及压拱机制已足够阻止连续倒塌的发生。配筋率的提高对压拱机制抗力影响不大，但能显著提高悬链线机制的抗力。跨高比对结构抗力机制的发展有着显著的影响，降低跨高比可以提高结构压拱和压膜机制抗力，但是对悬链线机制抗力影响不大。

Abstract

In order to study the progressive collapse resistance of building structure under blast load. In this paper, ANSYS/LS-DYNA finite element software is used to study the dynamic response of reinforced concrete (RC) beam-slab substructure resistance progressive collapse under blast load, and the concrete strength, reinforcement ratio and span ratio are extended and analyzed. The results show that transient column removal can lead to conservative or high degree structural residual capacity and damage. The concrete strength has a significant effect on the dynamic response of structure. When the concrete strength is greater than C40, the compressive menbrane action and arch mechanism of the structure are enough to resist collapse. The increase of reinforcement ratio has little effect on the resistance of arch action, but can significantly improve the resistance of catenary action. The span height ratio has a significant influence on the development of structural resistance mechanism. The reduction of span height ratio can improve the resistance of arch action and compressive menbrane action, but has little influence on the catenary action resistance.

导出引用

李治1,2，原小兰2，董腾方2，黄茜3，邓小芳1,2. 爆炸荷载作用下RC梁-板子结构抗连续倒塌动力效应研究[J]. 振动与冲击, 2023, 42(9): 27-35

LI Zhi1,2, YUAN Xiaolan2, DONG Tengfang2, HUANG Xi3,DENG Xiaofang1,2. Anti-progressive collapse dynamic effect of RC beam-slab substructure under blast load[J]. Journal of Vibration and Shock, 2023, 42(9): 27-35

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