Numerical Simulation Research On BFRP Strengthening Reinforced Concrete Slabs And Dams Under Explosive Loading

As global security issues become the top issues on the political and industrial agenda,there is increasing attention to protecting critical infrastructure from the adverse effects of explosions and shocks.Reinforced concrete beams and floor slabs are an important part of building facilities.Fiber-reinforced composite materials have the characteristics of light weight,high strength,and corrosion resistance,which make anti-explosive reinforcement measures convenient,quick and applicable^[1],so they have received more and more attention.BFRP fiber is a popular composite material studied by foreign scholars in recent years.This paper uses BFRP fiber to strengthen the RC slab and the dam structure to explore the dynamic response under the explosion load.The numerical simulation method is used to verify the test,and then the parameter analysis is carried out.The main research work of this paper is as follows:1 using the CONWEP code embedded in ABAQUS,the model of reinforced concrete plates subjected to explosive loading was established to simulate the TNT explosion process of reinforced concrete plates under free air,The numerical simulation results are compared with the test results of other scholars,and the accuracy of the rate-dependent concrete constitutive model is verified.The parameterization method is used to analyze the mechanical properties of the BFRP reinforced concrete slab under the action of air impact.2 The finite element software ABAQUS was used to simulate the dynamic behavior of the reinforced concrete slab under the contact explosion load,and the accuracy of the fluid-structure coupling model was verified.The fluid-solid coupling model is used to simulate the mechanical behavior of the banana-shaped reinforced concrete slab under the action of underwater explosion.Difference between acoustic-structure coupling results（CEL）and that of the UNDEX with ABAQUS is analyzed.Comparing the damage of air explosion with that of underwater explosion,it is found that the damage of RC structure is serious.3 Considering the influence of different parameters of BFRP fiber on the dynamic response of reinforced concrete slab,and the influence of layout method on the dynamic response of slab,layer number and proportion distance of BFRP fiber reinforced RC SLAB is analyzed.The reinforcing effect of BFRP fiber is the best with the Middle Cross arrangement,the second with the Strip arrangement,and the worst with the middle hollow out arrangement.The more layers of BFRP,the better the reinforcement effect,reaching more than 50%.4 The dynamic response of the concrete dam under explosion is analyzed by using the waterproof property of BFRP fiber,which has certain engineering value in the field of ocean engineering.It can be used for reference for the protection of dam structure.