Seismic Performance Analysis Of End-reinforced High-strength Steel And Concrete T-shaped Short-pier Shear Walls

Short pier shear wall,as a new type of structure between special-shaped columns and shear walls,has received more and more attention from scholars at home and abroad because of its good performance and reasonable structural layout.However,the low bearing capacity and poor seismic performance limit the application of short pier shear walls in seismic areas.The traditional short pier shear wall components of traditional buildings usually use ordinary steel bars as the stressed steel bars.When the load is large,the overlap of the steel bars will be too dense,and the excessive consumption of steel bars will also be caused,which will affect the construction progress and project quality.By configuring high-strength steel bars for short pier shear walls,it can save costs,improve construction progress,save materials,save energy and protect the environment.In this paper,a comprehensive analysis of the seismic performance of concrete short pier shear walls with high-strength steel bars is carried out and a theoretical basis is provided for popularizing its application in practical engineering.In this paper,19 T-shaped short pier shear walls are designed,and the hysteretic performance,bearing capacity,ductility,stiffness degradation and energy dissipation capacity of the wall under low-cycle repeated loads are analyzed by ABAQUS software.Due to the asymmetry of the T-shaped short pier shear wall structure,the failure of the web end is earlier than that of the flange.Therefore,in this paper,the web end of the Tshaped short pier shear wall is strengthened by setting hidden columns,and The feasibility of the scheme is verified by comparing the seismic performance of the dark columns at the ends.Through comparative analysis of axial compression ratio,longitudinal reinforcement strength of concealed columns,stirrup spacing,longitudinal reinforcement ratio,concrete strength grade,wall longitudinal reinforcement strength,stirrup strength and shear span ratio,the T-shaped short piers reinforced at the ends are compared Influence of the seismic performance of shear walls.The difference in seismic capacity of T-shaped short pier shear wall with high-strength steel bars and ordinary reinforced concrete short pier shear wall under the same conditions is compared and analyzed.And the comparative analysis and research results show that the configuration of high-strength steel bars can improve the hysteretic performance,bearing capacity and energy dissipation capacity of T-shaped short pier shear walls;Improve the bearing capacity,ductility and energy dissipation capacity of the wall.The greater the axial compression ratio,the greater the bearing capacity of the T-shaped short pier shear wall,but the corresponding ductility will be worse;increasing the reinforcement ratio and increasing the concrete strength grade can improve the bearing capacity of the wall;reduce the stirrup Spacing can improve the deformation capacity of T-shaped short pier shear walls.In order to make the simulation results more accurate,this paper uses the research group to deduce the calculation formula of concrete damage factor optimized on the basis of the CDP model and the tension method based on the energy equivalence principle.This calculation formula fully considers the hysteresis rules in the ABAQUS software.The steel constitutive method adopts the PQ-Fiber subprogram of Tsinghua University to simulate the bond-slip of the reinforced concrete interface.The steel constitutive,concrete constitutive,setting of boundary conditions,meshing and setting of loading system are all discussed and verified in detail.On the basis of this verification,the seismic performance of the end-reinforced T-shaped short pier shear wall is simulated and analyzed.