Numerical Simulation Of Propagation Rules Of Blast Shock Waves In Building Groups

With the development of society and economy,the explosion has gradually become one of the major disasters endanger people's living environment,more attention is paid to security issues become,once in a highly populated and centralized city environment sudden explosion will bring serious consequences to city residents life and property safety and city public property safety.Although in recent years the research on the explosion of domestic and foreign scholars deeply,but for the wave propagation mechanism in the buildings of the explosion shock is not clear,the lack of a typical mechanical model of buildings explosion problem,and the lack of a spatial distribution of overpressure related buildings explosion disaster evaluation and prevention methods.It is intended in the dissertation to select typical architectural complex factors for the study and establish a finite element model with LS-DYNA software to analyze transmission mechanism of explosion wave and its influence factors.The research work includes the following several aspects:(1)Based on reading references,appropriate material parameters are selected in the dissertation to perform the numerical simulation for an explosion example with ANSYS/LS-DYNA.The numerical results show that the method in the dissertation can be proved reliable for the numerical simulation and prepare for the numerical simulation of the architectural complex.(2)A finite element model of typical architectural complex is set up in the dissertation with LS-DYNA software to numerically analyze attenuation law of explosion wave.Research on attenuation law of explosion wave and the overpressure spatial distribution regularity with Time-Varying features.Three kinds of typical overpressure influence scope are determined,According to the influence scope of overpressure,the single building and the dense architectural complex are studied by zoning method.(3)Considering the effect of different scaled distances and street width ratio,a dense architectural complex.Considering the influence of explosion disaster assessment methods;according to the results of the analysis,put forward to reduce the explosion shock wave to the buildings,building the external environment affect and influence the life and property measures.