Dynamic Response Analysis Of Frame-Shear Wall Structure Under Blast Load

The research object of this paper is the reinforced concrete frame-shear wall structure.Based on the existing detonation theory and finite element theory,the LS-DYNA analysis software recognized by many scholars is used for simulation analysis.Moreover,combined with an explosion test,the damage effect of the components and the whole structure of the frame-shear wall structure under the action of explosive load is studied,thus obtaining the damage process and law of the structure under explosive load.The research results of this paper have reference significance for studying the vulnerability and explosion effect of the structural target.The main research contents of this paper are as follows:1)The typical explosion cases at home and abroad are analyzed.Then,the research purpose and significance of this paper is obtained.By reviewing the current research status at home and abroad,the existing research on dynamic response of frame-shear wall structure under the explosive load is grasped.Then,the explosion load is classified according to the explosion location of explosives,and the empirical formula of overpressure peak values recognized by a majority of scholars is listed.Furthermore,the constitutive model and state equation selected in this paper are presented,and the evaluation standard of structural components is introduced.2)The explosion load is simulated and analyzed with ANSYS/LS-DYNA software.The transmission process of shock wave overpressure is analyzed by numerical simulation,and the shock wave overpressure peak values at the same distance under different grid sizes are extracted.By co MParing the overpressure peak values in explosion simulation with the overpressure peak values in empirical formula,the errors between simulation results and empirical formula under different grid sizes are verified.Meanwhile,the rationality of grid size division,material parameters of air model,and material parameters of explosion model in this numerical simulation is obtained,which provides a basis for the dynamic response of the frame-shear wall structure studied in this paper under explosion load.3)In this paper,the data of simulation results are co MPared with the data of loading test results.It is concluded that the material parameters and constitutive relations of air,concrete and explosives defined in the simulation analysis are correct.At the same time,the setting of boundary conditions is verified to demonstrate that the definitions in the software are correct.In addition,it is found that the simulation results and the experimental results from the selected parameters and conditions in this numerical simulation have a deviation of less than 10%.4)Through the finite element analysis software ANSYS/LS-DYNA,the simulation model of the scaled building with reinforced concrete frame-shear wall structure is established,and the dynamic response of the scaled building with frame-shear wall structure under six working conditions is calculated and analyzed using the method of fluid-solid coupling.Further,the damage process and displacement of the whole structure are analyzed.Meanwhile,the displacement time travel curves of the structural components are co MPared and analyzed,and the influence of different positions and different equivalents on the dynamic response of the frame-shear wall structure is explored,which provides a reference for studying the vulnerability and explosion effect of the solid target.The damage process and law of the structure are analyzed through numerical simulation.Furthermore,co MPared with the test data,the constitution and parameters suitable for the simulation analysis of frame-shear structure are acquired.Although the numerical simulation results have a deviation 10%,it is acceptable for engineering applications.