Finite element analysis on progressive collapse resistance of five story full-scale prestressed precast frame

To study the progressive collapse resistance of the precast prestressed efficiently fabricated frame (PPEFF) system, based on the ABAQUS/standard implicit finite element analysis platform, a multi-scale nonlinear dynamic analysis model is used to simulate the state of the five story full-scale test model under the conditions of failure of the top corner column, the side column on the fourth floor and the bottom corner column, respectively, and the results were compared with the test results. On this basis, a parametric study was conducted to investigate the effects of various parameters on the progressive collapse resistance of the PPEFF system; the investigated parameters included the equivalent impact loading time of columns, the presence or absence of floor action and the representative value of floor gravity load. The numerical analysis results are in good agreement with the experimental results. The equivalent impact loading time is shown to have little effect on the steady state displacement of the structure, and the loading method of using the slider and double micro friction surfaces is feasible. The floor slab is shown to have great influence on the progressive collapse resistance of the structure, since the floor slab can significantly reduce the vertical vibration amplitude of the remaining structure and thus improve the progressive collapse resistance of the remaining structure. When the representative value of floor gravity load is doubled, only part of the concrete enters the plastic state, the reinforcement and prestressed reinforcement are in the elastic state, the structural deformation is small, and the PPEFF system still has good progressive collapse resistance performance. © 2023 Science Press. All rights reserved.