In order to analyze the mechanical properties of the steel truss roof burst in the case of defective within, the use of non-linear display dynamic finite element analysis software ANSYS / LS-DYNA to study the different effects of different random defect structure. The measured defect data is obtained by a construction tube truss roof structure .To accord to the random sampling method, defects randomly distributed and the parametric statistical information is to establish. Defect structure antiknock performance is derived, considering the tube truss structure roofing layer, and unconsidering the two simulation models for pipe truss structure roofing layer, and taking into account the rod defects affect the dynamic characteristics of tube truss structure to explosivesposition, explosives equivalent parameters by analyzing and comparing the different parameters of the explosion of the power of the tube truss structure response. Roof layer, the location of the explosion, explosives equivalent with tube truss structure antiknock performance relationship and the weak position of the structure is determined to ensure that the building security to provide a theoretical basis . The results show that the tube truss structure system when the explosion shock wave loads, its dynamic response is a very complex process, the role of the explosion shock wave loading, pipe truss the plastic development process and the structure of the internal location of the explosion, explosivesweight, defects, and consider whether the the roofing layer has relationship.
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