Vertical Explosion Loading Performance Of The Reinforced Concrete Beam Under Finite Element Analysis

In recent years, due to the political and economic causes social contradictions, makes the terrorist activities in the world scope has come up, and bombings terrorism become the most important form. As is known to all, explosion of civil building damage is very big, so some important buildings become the terrorist bombings goal. So, structure in the explosion load under the action of dynamic response analysis and structure of antiknock explosion-proof measures has become the domestic many scholars and experts research focus.Our country in antiknock explosion-proof research is still in its beginning stages. Explosion load is a special load, its features include action time short, load the intensity is high, the blast wave high frequency, strain rate effect prominent, etc. About reinforced concrete structure antiknock performance research, there are three kinds of traditional research methods, namely for field test method, theoretical analysis, numerical simulation analysis. Considering the explosion experiment security can’t control, the cost is high, the ground not choice and explosive process great destructive, and experimental process is very complicated, plus some unpredictable factors and immature conditions, to a great extent, have limited explosion experimental research. With the rapid development of computer and widely used, the computer numerical simulation method in the field of explosion got very good application, so compared with the computer numerical simulation of great feasibility and superiority.This paper introduces the basic knowledge of the explosion imagine, explosion shock wave of the formation and propagation process, shock wave of the incident and reflected; Detailed describes the explosion similarity law, explosion wave parameter calculation method, under the action of explosion load material mechanical properties and explosion load action principle; This paper expounds the finite element dynamic analysis software ANSYS/Is-dyna analysis process and the main algorithm, and by using the analysis software selection reasonable unit and material model, numerical simulation, and the calculated results and the experimental results were compared to verify the correctness of the model and parameter choice; This chapter through the finite element numerical simulation analysis of the explosion loads, the reinforced concrete beam different concrete strength grade, reduced distance, ratio of longitudinal reinforcement, stirrup spacing and section size of the beam antiknock performance influence, main observation beam support place longitudinal bar shear, beam deformation and beam in the middle of span section node vertical displacement change, to judge analysis of the reinforced concrete beam antiknock performance is improved.