Research On The Seismic Performance Of End-Strengthened Double Steel Plate Concrete Composite Shear Wall

Double steel plate concrete combination shear wall is composed of steel plates on both sides,shear joints and sandwich concrete together.In this paper,a systematic finite element simulation and theoretical analysis of the end-strengthened double-plate concrete shear wall reinforced by H-beam and Steel-Fiber-Reinforced High-Strength Concrete(SFRHSC)are carried out.The main contents of the research in this paper are as follows:(1)In order to verify the reasonableness of the established model,numerical simulations of the feasibility of the seismic performance of SFRHSC and double steel plate concrete combination shear walls were carried out using ABAQUS finite element software,and the corresponding models were established and compared with their test results through the existing tests.It is concluded that the errors are within a reasonable range,so that the seismic performance of the end-strengthened double steel plate concrete combination shear wall can be analyzed numerically in an effective and reasonable way using the finite element software ABAQUS.(2)Based on the verification of the proposed static test,ABAQUS was used to establish the SFRHSC end-strengthened double-plate concrete combined shear wall model,and 15 specimens were designed with axial compression ratio,strength grade of abdominal steel fiber-free concrete and steel fiber admixture as the main parameters to analyze the influence law of these parameters on the seismic performance indexes such as bearing capacity,ductility,stiffness degradation and energy dissipation capacity of the specimens and the specimens The damage mode and stress mechanism reveal that the axial pressure ratio,strength grade of concrete without steel fiber in the abdomen and the amount of steel fiber admixture have significant effects on the specimens.As the axial pressure ratio decreases,the strength grade of abdominal steel fiber-free concrete increases and the amount of steel fiber admixture increases,which improves the ductility and deformation capacity,stiffness degradation and energy dissipation capacity of the specimens.(3)On the basis of setting SFRHSC at the end,H-beam was set at the end of the specimen,which was designed as a combined concrete shear wall with double steel plates reinforced at the end of H-beam SFRHSC.Under horizontal cyclic reciprocating load,high axial pressure ratio was set to study the effects of steel plate strength,section strength,height to width ratio and section type on the seismic performance of the specimens.The study shows that with the increase of steel plate strength grade,section strength grade and aspect ratio,the ductility of this type of combined shear wall is increasing,and the ductility of the specimen with cross section steel at the end is better than that of the specimen with H section steel at the end.(4)On the basis of end-strengthened double-plate concrete combined shear walls,different specimen heights of 20%,30%,40% and 50% of SFRHSC height were set at the bottom of the specimens,compared with the specimens without SFRHSC at the bottom,SFRHSC effectively suppressed the flexure at the bottom of the specimens and improved the specimen bearing capacity,ductility and deformation capacity,stiffness degradation and energy dissipation capacity,with the setting of The seismic performance of the specimens was gradually improved with the increase of the height of SFRHSC.