Study On Anti-explosion Performance Of Curved Double Steel Sandwich Composite Wallboard Under Near-field Explosion Load

In recent years,all kinds of explosion accidents occur frequently at home and abroad,which has brought serious harm to the peace and stability of today’s world.As the main component of the building,the wallboard is the key research object of the anti-explosion analysis of the structure.However,the traditional reinforced concrete wallboard is easy to be destroyed under the action of explosion impact.Therefore,a new type of curved double steel plate sandwich composite wallboard is proposed in this paper.Based on its dynamic response and stress mechanism under near-field explosion,the numerical analysis models of four different types of connection pieces,namely,the Dummy plateCurved double Steel plate sandwich Composite Wallboard(DCSCW),the Pull BoltCurved double Steel plate sandwich Composite Wallboard(PCSCW),the Superimposed Bolt-Curved Double Steel plate sandwich Composite Wallboard(SCSCW)and the Toggle Pin-Curved double Steel plate sandwich Composite Wallboard(TCSCW),were established and tested.The influences of steel plate thickness,TNT equivalent,blast distance and connector spacing on the anti-explosion performance of composite wall panels with different connectors and their laws are discussed and analyzed.The main research contents of this paper are as follows:(1)According to the specification,the 1:4 scale scale of the Dummy plate-Curved double Steel plate sandwich Composite Wallboard(DCSCW)was designed,and the experimental study was carried out under the action of near-field explosion.The pressure time-history relationship of the explosion shock wave under the action of near-field explosion was obtained,and the deformation status and anti-explosion performance of the curved composite wall panel were analyzed.(2)The finite element analysis software ANSYS/LS-DYNA was used to establish the numerical model of the diaphragm curved composite wall panel,and the finite element analysis of the diaphragm curved composite wall panel was carried out.Based on the test results,it was compared with the numerical analysis results to verify the reliability and accuracy of the numerical analysis model.(3)Based on the finite element model verified by the experiment,the numerical analysis of three different connection curved double steel plate sandwich composite wallboard,namely,the Dummy plate-Curved double Steel plate sandwich Composite Wallboard(DCSCW),the Pull Bolt-Curved double Steel plate sandwich Composite Wallboard(PCSCW),the Superimposed Bolt-Curved Double Steel plate sandwich Composite Wallboard(SCSCW)and the Toggle Pin-Curved double Steel plate sandwich Composite Wallboard(TCSCW)were designed and carried out.The difference of antiexplosion performance and response mechanism of the scurved double steel plate sandwich composite wallboard with different connection under near-field explosion is analyzed from the aspects of damage,deformation and energy dissipation of concrete.The numerical analysis of the curved double steel plate sandwich composite wallboard and the flat double steel plate sandwich composite wallboard under the action of nearfield explosion is carried out,and the deformation of steel plate and concrete damage are compared.The results show that the curved double steel plate sandwich composite wall panel has better anti-explosion performance than the flat double steel plate sandwich composite wall panel.(4)The influence of the thickness of steel plate,TNT equivalent,blast distance and connector spacing on the mid-span deflection,energy dissipation,concrete damage and steel plate deformation of the curved double steel plate sandwich composite wallboard with different connection was analyzed by parameterization.The results show that:Increasing the thickness of steel plate can effectively reduce the maximum mid-span deflection of bottom steel plate and the depression depth of concrete center area.Reducing TNT equivalent and increasing blast distance can significantly reduce the maximum mid-span deflection of bottom steel plate,and reduce the damage of concrete and the depression in the central area.The depression depth of the bottom steel plate and concrete center area and the space between the four kinds of connectors have a nonlinear increasing relationship.