Study On Seismic Performance Of Fabricated Concrete Shear Wall Using New Vertical Joints

The connection form is the most basic problem faced in the design of assembled buildings,which directly affects the mechanical performance of the structure.Referring to the bolting connections commonly used in steel structures,a new vertical seam connection form of fabricated shear walls is proposed,namely steel-plate bolted connection form.In order to study the mechanical behavior of prefabricated shear wall with new vertical connections proposed(briefly denoted as SB-S)in this paper,specific work is as follows:(1)Based on the ABAQUS finite element software,the numerical simulation of a prefabricated shear wall with embedded steel plate-bolt vertical connections was conducted.The simulate hysteresis curve has obvious pinching effect,and the curve in each unloading stage almost coincides with the test curve.The test bearing capacity is slightly larger than the simulate value,and the relative error is less than 20%.The damage development of test and numerical model are similar to each other.This indicates that it is feasible to study the mechanical behavior of prefabricated shear wall using numerical method,which proves that the research idea can be used for subsequent work.(2)Based on the prefabricated shear wall model proposed by Southeast University(VW-1),a SB-S model(W-1)and a cast-in-place wall model(W-2)were designed with the same geometric size.The seismic performance of the three walls were analyzed using ABAQUS software.A series of indicators such as the stress cloud diagram,hysteresis curve,skeleton curve,ductility coefficient,stiffness degradation and energy consumption were compared.The results show that the bearing capacity of W-1 is slightly higher than that of VW-1,and the bearing capacity of the W-1 and W-2 are almost same,and the stress cloud diagram,ductility,energy dissipation capacity and stiffness degradation trend of the W-1 and W-2 are basically the same,which indicates that the connector has engineering feasibility.(3)The effects of different variable parameters on the mechanical performance of the SB-S were analyzed.The parameter includes the axial compression ratio,bolt arrangement and dosage,concrete strength,joint steel frame thickness,bolt pre-tightening force,anti-slip coefficient and wall hoop ratio.The analysis results show that the axial compression ratio and the wall hoop ratio have great influence on the energy dissipation capacity of the SB-S.The bolt arrangement and the thickness of the joint steel frame have a great influence on the stress distribution of the SB-S.The increase of the bolt preload force can improve the bearing capacity of the SB-S in a certain range.The strength of concrete and anti-slip coefficient have no obvious influence on the mechanical performance of the SB-S.