Study On Seismic Performance Of Assembled Shear Wall With Different Connection Methods

In this paper,the seismic performance of concrete grade C30 with axial compression ratio of 0.4 grouting sleeve slurry anchor connecting shear wall and a kind of shear wall specimen with dark beam at the bottom is studied.On the basis of the experiment,the seismic performance of ABAQUS finite element software was used to study it.A total of three shear wall specimens were fabricated,namely,assembled shear walls connected by sleeve slurry anchors,cast-in-place shear walls with concealed beams at the bottom,and cast-in-place shear wall specimens.The pseudo-static test was carried out on the three test pieces,and the test results and failure modes of the three test pieces were analyzed.The seismic performance parameters such as hysteresis curve,skeleton curve,stiffness degradation,ductility and energy consumption are compared and analyzed.On the basis of the experiment,finite element simulation of three test pieces was carried out by ABAQUS finite element software.Choose appropriate constitutive parameters,establish a reasonable finite element model,and simulate low-cycle repeated load tests.Comparative analysis of simulation and test results to verify the feasibility of finite element simulation.Using the ABAQUS finite element software,the seismic performance law of two different connection types of shear walls under different axial compression ratios and aspect ratios was studied.Simulate a prefabricated shear wall with edge member reserved post-casting area and dark beam at the bottom,and compare with the cast-in-place shear wall respectively.The following conclusions can be drawn from the test process and simulation results(1)The failure process and phenomenon of the assembled shear wall specimen connected by the sleeve slurry anchor are similar to the cast-in-place specimen.All of them are the vertical reinforcement of the edge members yielding,and the bottom concrete on both sides of the wall is crushed and collapsed.During the test,there was no phenomenon of dislocation and separation between the shear wall and the foundation.The prefabricated shear wall connected by sleeve slurry anchor can effectively transmit the vertical reinforcement stress,and the seismic performance is close to the cast-in-situ test piece.(2)Shear wall specimens reinforced with concealed beams at the bottom are not all connected to the foundation because of the vertical distribution of steel bars,and the bearing capacity is 16% lower than that of cast-in-place specimens,but they can meet the theoretical calculation values.The stiffness deteriorated slightly faster,and the ductility coefficient and energy dissipation capacity were lower than those of cast-in-place specimens.It still has good energy consumption capacity.It is feasible to adopt this connection method.(3)The ABAQUS finite element software simulates three test pieces,and the simulation results are basically consistent with the actual conditions of the test.It shows that the model established by finite element is reasonable and reliable,and the selection of constitutive model is reasonable,and related research can be carried out on this basis.(4)The parameter analysis shows that as the axial compression ratio increases,the peak load capacity of the specimen increases and the ductility becomes lower and lower.The specimens of the shear wall with concealed beam at the bottom are more uniformly stressed when the axial compression ratio is 0.2 and 0.3.When using this connection design,the axial pressure ratio should not be too high.The aspect ratio is inversely related to the carrying capacity.When the aspect ratio is very small,shear failure of the specimen occurs,which is not conducive to earthquake resistance.Reinforcements connected with sleeve slurry anchors of specimens with different aspect ratios can effectively transmit vertical reinforcement stress,and there is no slippage between the wall and the foundation.From the simulation of the assembled test specimens with edge members in the post-casting area,it can be seen that the seismic performance of the assembled shear wall specimens with concealed beams and the cast-in-place shear wall specimens with concealed beams are similar.The reliability of the prefabricated wall structure with edge castings and post-casting areas was verified.(5)Comprehensive test and numerical simulation results comprehensively summarize the research contents and results.And made a preliminary analysis of the future research direction.Figure [78] table [7] reference [61]...