底框上部砌体结构抗爆性能研究

The three dimensional model of masonry buildings with bottom frames and seven-storey was set up with explicit dynamic analytical software LS-DYNA. GSA criteria analysis method was carried out in the numerical analysis of the masonry buildings with bottom frames’ progressive collapse. There are some disadvantages of GSA criteria analysis method in the aspect of the simulative truth, so two-stage analysis method was created against the disadvantages of GSA criteria analysis methods. The structural damage was first at local, and the local damage was the reason why the progressive collapse of the structure happened. If we use some countermeasures to prevent the structural local damages, the progressive collapse of the structure may not happen. Various masonry material strengths, reinforced ratios of the vertical bar, GFRP strengthening, steel plate strengthening, arrangement of columns, wall openings and building storey number of the bottom frames were selected to verify the model. The dynamic response laws and destructive condition of the masonry buildings with bottom frames under explosive shock were obtained. The rule of the stress and the displacement of the masonry and reinforcing bars were given at the same time. All these works offer the theoretical principle and meritorious reference data for anti-explosion design of masonry buildings with bottom frames.