Kinked rebar configurations for improving the progressive collapse behaviours of RC frames under middle column removal scenarios
Kinked rebar configurations for improving the progressive collapse behaviours of RC frames under middle column removal scenarios
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用于改善 RC 框架在中柱拆除情况下的渐进倒塌行为的扭结钢筋配置
DOI：
10.1016/j.engstruct.2020.110425
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发表时间：
2020
影响因子：
5.5
通讯作者：
Qin Weihong
中科院分区：
文献类型：
--
作者：
Qiang Hanlin;Yang Jianxiang;Feng Peng;Qin Weihong
对于钢筋混凝土（RC）框架结构，在梁中应用更多的连续纵向钢筋是提高抗连续倒塌能力的最有效方法。然而，RC 框架有可能经历多种倒塌机制。钢筋混凝土框架不仅可能会因关键柱拆除而发生连续倒塌，而且可能会在强震下发生横向倒塌。抗震设计中的强柱弱梁（SCWB）要求不允许梁中存在过多的纵向钢筋。为了解决这一矛盾，之前的一项研究提出了一种新型扭结钢筋 (KB) 配置，以增强 RC 框架的抗震性和抗连续倒塌能力。本研究的目的是对 KB 配置的 RC 框架的渐进倒塌行为进行进一步的实验验证和研究。首先，对9个RC框架下部结构进行了准静态连续倒塌试验。试验结果表明，KBs的应用可以提高RC下部结构悬链线机制下的承载能力和变形能力。对于钢筋混凝土下部结构，还研究了各种结构参数对连续倒塌行为的影响。其次，进行有限元模拟来模拟测试样本的行为。本研究通过实验验证了KB构型可以提高RC框架结构的抗连续倒塌能力，并阐明了KB构型新型RC框架下部结构的连续倒塌机理。
For reinforced concrete (RC) frame structures, applying more continuous longitudinal bars in the beams is the most effective way to improve the progressive collapse resistance. However, an RC frame has the possibility to experience multiple collapse mechanisms. An RC frame may not only experience progressive collapse caused by critical column removal but may also experience lateral collapse under strong earthquakes. The strong column-weak beam (SCWB) requirement in seismic design does not allow excessive longitudinal reinforcement in the beams. To solve this contradiction, a previous study proposed a novel kinked rebar (KB) configuration to enhance both the seismic and progressive collapse resistances of RC frames. This study was carried out to conduct further experimental validation and investigation of progressive collapse behaviours of RC frames with KB configurations. First, a quasi-static progressive collapse test involving 9 RC frame substructures was carried out. The test results indicated that the application of KBs could increase both the loading and deformation capacities under the catenary mechanism of RC substructures. For RC substructures, the influences on progressive collapse behaviours from various structural parameters were also investigated. Second, finite-element simulations were carried out to model the behaviours of the test specimens. This study experimentally verified that the KB configuration can improve the progressive collapse resistances of RC frame structures and clarified the progressive collapse mechanism of novel RC frame substructures with KB configurations.