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Numerical studies on the progressive collapse resistance of multi-story RC buildings with and without exterior masonry walls
Structures ( IF 4.1 ) Pub Date : 2020-09-29 , DOI: 10.1016/j.istruc.2020.07.049
Sandy Nyunn , Feiliang Wang , Jian Yang , Qing-feng Liu , Iftikhar Azim , Sanjeev Bhatta

This paper investigates the influence of perforated masonry walls on the progressive collapse resistance of multi-story reinforced concrete (RC) structures. In this study, bare and infill-wall RC frames are studied by considering column failure at corner and exterior locations. Infill-wall panels are simulated by using equivalent compression struts and their provision of alternate load paths under the removal of a critical load-bearing element is examined. Linear static, nonlinear static, and nonlinear dynamic analyses are conducted by following the General Service Administration (GSA) guidelines. The analysis results show that the infill walls are beneficial in the redistribution of loads after the failure of the column and the collapse resistance of the RC building is increased. Empirical dynamic amplification factors (DAF) are also calculated in the sequel and the factor instructed in the GSA guidelines is judged by comparing with these computed dynamic factors. The results show that the DAF of 2, recommended by the GSA guidelines, is conservative and the presence of infill walls does not significantly affect the value of DAF.



中文翻译:

带有和不带有外部砌体墙的多层RC建筑的渐进式抗倒塌性能的数值研究

本文研究了多孔砖砌墙对多层钢筋混凝土(RC)结构的抗连续塌陷性的影响。在这项研究中,通过考虑墙角和外部位置的柱破坏来研究裸墙和填充墙钢筋混凝土框架。填充墙面板通过使用等效的压缩支柱进行模拟,并检查了在移除关键的承压元件后它们提供的替代荷载路径。遵循总务管理局(GSA)准则进行线性静态,非线性静态和非线性动态分析。分析结果表明,在柱子破坏后,填充墙有利于荷载的重新分配,并提高了钢筋混凝土建筑物的抗倒塌能力。经验动态放大因子(DAF)也会在续集中计算,并且通过与这些计算出的动态因子进行比较来判断GSA指南中指示的因子。结果表明,GSA指南建议的DAF为2,这是保守的,填充墙的存在不会显着影响DAF的值。

更新日期:2020-09-30
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