Study On The Effect Of Shear Connection On The Mechanical Performance Of Thick Double Steel Plat Concrete Shear Walls

The combination of thick dual steel plate and concrete structure has many advantages,such as high load-bearing capacity and strong durability.It has been widely used in engineering projects such as nuclear power and immersed tube tunnels.The performance of dual steel plateconcrete composite shear walls depends on the collaborative work of the steel plates and concrete,and shear connectors,as important components connecting the steel plates and concrete,play a crucial role in their collaborative work.There are various forms of shear connectors,and their load-bearing performance is complex.However,currently,there is relatively limited research on the load-bearing performance of shear connectors in composite walls.In this paper,numerical simulation methods were used to study the shear resistance performance of shear connectors and their influence on the seismic performance of dual steel plate-concrete composite shear walls.The main content and achievements are as follows:(1)A numerical model of the push-out test of a thick double steel plate concrete composite structure was established using finite element software.The influence of the concrete constitutive relationship and the contact between the stud and concrete on the simulation results was studied,and the simulation results were compared with the test results.The results show that the load-slip curve and shear resistance capacity obtained by numerical simulation are consistent with the test results,and the failure mode of the specimen is similar to the test results,indicating that the finite element method used in this paper can provide support for subsequent research.(2)The influence of changes in bolt diameter,bolt length,concrete strength,and the ultimate strength of bolts on the shear bearing capacity of bolt groups was studied.The results indicate that the shear bearing capacity of bolt groups increases with an increase in bolt diameter,bolt length,concrete strength,and the ultimate tensile strength of bolts.However,the influence of bolt length and variations in the ultimate strength of bolts on the shear bearing capacity of bolt groups is lower compared to the influence of bolt diameter and variations in concrete strength.Furthermore,considering the effect of bolt group spacing and the number of rows on the shear bearing capacity of single bolts,the study investigates the impact of changes in bolt group spacing and the number of rows on the shear bearing capacity.Based on the calculation method proposed by relevant scholars for the shear bearing capacity of bolts,this paper presents a calculation formula for the shear bearing capacity of bolt groups in the combination of thick dual steel plate and concrete structures,based on finite element calculation results.Furthermore,considering the influence of bolt spacing and the number of rows on the bolt group effect,a calculation formula for the shear bearing capacity of bolt groups suitable for thick dual steel plate structures is established,providing valuable insights for relevant engineering practices.(3)Different forms of shear connectors were applied to the double steel plate concrete shear walls of nuclear power plants.A numerical analysis model of the double steel plate concrete shear wall was established,and the effect of four types of shear connectors,namely studs,J-hooks,tension bars,and stiffeners,on the seismic performance of the double steel plate concrete composite shear wall was studied.On the basis of studying the form of the shear connector,the influence of the shear connector spacing and diameter(thickness)on the seismic performance of the double steel plate concrete composite shear wall was further studied.