Abstract

Due to the frequent occurrence of natural disasters and terrorist attacks, research on resisting progressive collapse has attracted increasing attention from the engineering and academic communities. Numerous experimental studies conducted in recent decades have focussed on single-story 3D structures; however, there are many differences between single-story 3D structures and multistory 3D frames due to spatial effects. Therefore, a 1-bay-by-2-bay two-story reinforced concrete (RC) frame with the loss of one edge column was constructed, tested and analysed in this study. The collapse phenomena, load–displacement curves, lateral displacements and axial load distributions were recorded and discussed. Furthermore, the effect of the slab on the progressive collapse resistance of the multistory 3D frame without one bottom edge column was investigated using ABAQUS software. Moreover, a previously presented dynamic resistance model was modified in this article, and the contributions of the beams and slabs to the progressive collapse resistance of the multistory 3D frame were theoretically analysed. The slabs and beams in these frames could contribute approximately 1/3 and 2/3 of the load resistance, respectively.

摘要

由于自然灾害和恐怖袭击的频繁发生，抵抗渐进式坍塌的研究越来越受到工程界和学术界的关注。近几十年来进行的大量实验研究都集中在单层 3D 结构上。但是，由于空间效应，单层 3D 结构和多层 3D 框架之间存在许多差异。因此，在本研究中构建、测试和分析了一个失去一根边柱的 1×2 层钢筋混凝土 (RC) 框架。记录并讨论了倒塌现象、载荷-位移曲线、横向位移和轴向载荷分布。此外，使用 ABAQUS 软件研究了楼板对无底边柱的多层 3D 框架渐进抗倒塌能力的影响。此外，本文对之前提出的动态阻力模型进行了修改，从理论上分析了梁和板对多层 3D 框架渐进式抗倒塌的贡献。这些框架中的板和梁可以分别贡献大约 1/3 和 2/3 的负载阻力。