Numerical Simulation Of Frame Buildings Blasting Demolition By Gradual Disintegration

In this paper, Based on the research state of demolition blasting in our country and out of country. It concluded the delay time by gradual disintegration after used classic mechanics knowledge to analyze the principle of disintegration structure becoming to unstable, the principle of structure rotation about a fixed axis after structure becoming to unstable ,the principle of converting of the structure potential energy and the principle of propagation of stress wave in solid. After analyzed material mechanics constitutive model and structure blasting feature.lt adopted finite element method analysis software ANSYS to numerical simulate and analyze the frame-structure buildings by gradual disintegration blasting demolition. Provided that finite element model , yielding and destroy rule of material and solution method were rationally selected .It could conclude that the time relative to stress,strain,crack create and the location of plastic gemes distribute according to the law of rotary movement of structure after employed the simMechanics module in the MATLAB software simulating the motion process after structure destroyed absolutely . The least but not last .The primary conclusions was drawn in this paper that the law of the gradual disintegration delay time was nothing to do with the time of the detonation wave in solid by contrast analyzing the change of the stress at the plastic joint location follow time in the full course of structure collapse. It gained the more rational delay time of gradual disintegration in the course of ansys analysis. It could also conclude that the time of plastic joint form was directly proportional to the load time and was nothing to do with the load substep according to the relation of plastic joint form time and loading time and load substep. Otherwise ,It concluded that the delay time decided the time of plastic joint form and the time of plastic joint form decided the low time of delay time .