In this study, high fidelity finite element (FE) model was adopted to investigate the progressive collapse resistance of reinforced concrete (RC) frame structures under various column removal scenarios. The validity of the numerical model was verified by comparing with the existing experimental results. Afterwards, to facilitate the research on possible simplified boundary conditions served for further various column removal scenarios, the effect of multi-span continuous beams was firstly evaluated and the simplified methods were compared. Then, the effect of various column removal scenarios addressing the three-dimensional effect on the progressive collapse resistance of RC frame structures with and without slab was systematically evaluated. The analysis results showed that the continuous span beams increased the internal compressive force of the beam section at compressive arch action (CAA) stage, which effectively improved the CAA strength of the substructure. For simple modeling, the use of horizontal constraints at the end of the beam could replace the continuous span beams. The presence of transverse beams and slab provided additional load transfer paths for collapse resistance. The compressive membrane action (CMA) and tensile membrane action (TMA) of the slab significantly improved the progressive collapse resistance of the substructure in the small and large deformation stages, respectively. The location of the removed column significantly affected the contribution ratio of transverse beams and slab to the progressive collapse resistance of the substructure, which was quantitatively evaluated for practical design.

中文翻译：

---

不同柱拆除场景下三维空间对钢筋混凝土框架抗连续倒塌能力的影响

在本研究中，采用高保真有限元（FE）模型来研究钢筋混凝土（RC）框架结构在各种柱拆除情况下的抗连续倒塌能力。通过与现有实验结果的比较，验证了数值模型的有效性。随后，为了便于研究适用于进一步各种柱拆除场景的可能简化边界条件，首先评估了多跨连续梁的效果并对简化方法进行了比较。然后，系统评估了各种柱拆除方案对有板和无板的 RC 框架结构抗连续倒塌阻力的三维效应的影响。分析结果表明，连续跨梁增大了压拱作用（CAA）阶段梁截面的内压力，有效提高了下部结构的CAA强度。对于简单的建模，在梁端使用水平约束可以代替连续跨度梁。横梁和板的存在为抗倒塌提供了额外的荷载传递路径。板的压缩膜作用（CMA）和拉伸膜作用（TMA）分别显着提高了下部结构在小变形和大变形阶段的抗连续倒塌能力。拆除柱的位置显着影响横梁和板对下部结构抗连续倒塌的贡献率，并对其进行定量评估以供实际设计。