چكيده به لاتين
Evaluating the ability of structures to resist progressive collapse has been the focus of researchers and government agencies for years. During progressive collapse reinforced concrete structural components and systems undergoing large displacements and deflections. Due to the complexities in progressive collapse analysis, there was need for simple yet reliable nonlinear progressive collapse simulations of reinforced concrete systems that validated with experimental studies. In the present study, experimental tests was carried out on a 3/10 scale sub-assemblage in order to investigate the progressive collapse behavior of reinforced concrete structures. Investigation of alternative load paths and resistance mechanisms in scaled sub-assemblages, and differences between the results of full-scale and scaled specimens are the main goals of this research. Main characteristics of specimens' response including load-displacement curve, mechanism of formation and development of cracks, and failure mode of the scaled specimens had good agreement with the full-scale specimen. In order to provide a reliable numerical model for progressive collapse analysis of RC beam-column sub-assemblages, a macro-model was also developed. First, numerical model was validated with experimental tests in the literature. Then, experimental results in this study were compared with validated numerical results. It is shown that the proposed macro-model can provide a precise estimation of collapse behavior of RC sub-assemblages under the middle column removal scenario. In addition, for further evaluation, using the validated numerical model, parametric study of new sub-assemblages with different details, geometric and boundary conditions, was also done.
Keywords: Progressive collapse, RC frame, Column removal scenario, Scaled specimen, finite element analysis
