角柱失效下不等跨RC空间梁-柱子结构抗连续倒塌机理研究

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振动与冲击 ›› 2023, Vol. 42 ›› Issue (6) : 115-125.

论文

李治1,2，薛天琦2，原小兰2，张毅2，钱凯1,2

作者信息 +

Load resisting mechanism of RC spatial beam-column substructures with unequal spans in the loss of a corner column scenario

LI Zhi1,2，XUE Tianqi1,2，YUAN Xiaolan1,2，ZHANG Yi1,2，QIAN Kai1,2

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文章历史 +

摘要

本文通过角柱失效下钢筋混凝土(RC)空间梁-柱子结构的Pushdown加载试验及其精细化有限元模型，对不等跨RC空间梁-柱子结构在角柱失效工况下的抗连续倒塌性能进行研究。基于所建立的有限元模型对不等跨RC空间梁-柱子结构的抗力机制等进行更深入的分析，探究了角柱上部水平约束、角柱节点配箍率和空间效应对不等跨RC空间梁-柱子结构抗连续倒塌性能的影响。研究结果表明：角柱失效工况下的不等跨RC空间梁-柱子结构不能有效发展悬链线机制而主要依靠梁机制抵抗倒塌，且空腹机制抗力的贡献不可忽略。角柱上部水平约束的增强，会提高第一峰值荷载，但是同时会导致角柱节点承受更高的剪应力从而提早发生剪切破坏。角柱节点配置一定量箍筋后会延迟和减轻角柱节点发生剪切破坏，从而提高结构的抗连续倒塌能力。对于角柱失效工况，空间效应不能通过简单叠加两个方向的平面框架抗力进行计算，因为空间效应三维剪应力作用会加速角柱节点发生剪切破坏。

Abstract

In this paper, Pushdown loading tests was carried out on RC spatial beam-column substructure under loss of a column scenario and a refined finite element (FE) model was established, which were used to study the progressive collapse resistance performance of RC spatial beam-column substructures with unequal spans. And the influence of horizontal constraints on the top of corner column, transverse reinforcement ratio at corner joint, and spatial action on the progressive collapse resistance of substructure was analyzed. The results indicated that for the RC spatial beam-column structure under the loss of a corner column, the structure cannot develop effective catenary action and the collapse resistance mainly relied on the beam action. It should be noted that the contribution of Vierendeel action cannot be ignored. Increasing the horizontal constraints at the corner column, the first peak load of the substructures will increase. However, the corner column may suffer greater shear stress and prone to cause shear failure. Installing an amount of transverse reinforcement at the corner joint could delay or mitigate the shear failure of the corner joint. Thus, progressive collapse resistance capacity of the substructures could be upgraded. Moreover, for the case of corner column failure, the spatial effects could not be taken as simple summation of the load resistance of the plain frame as the spatial effects may aggravate the shear failure of the corner joint.

导出引用

李治1,2，薛天琦2，原小兰2，张毅2，钱凯1,2. 角柱失效下不等跨RC空间梁-柱子结构抗连续倒塌机理研究[J]. 振动与冲击, 2023, 42(6): 115-125

LI Zhi1,2，XUE Tianqi1,2，YUAN Xiaolan1,2，ZHANG Yi1,2，QIAN Kai1,2. Load resisting mechanism of RC spatial beam-column substructures with unequal spans in the loss of a corner column scenario[J]. Journal of Vibration and Shock, 2023, 42(6): 115-125

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