Experimental And Theoretical Study On Seismic Performance Of Resilient Shear Walls Based On UHPC

Structures may be seriously damaged after moderate or large earthquakes.Due to excessive deformation or partial collapse of some components in the structure,it is usually difficult to carry out repair work.Even if it can be repaired,it will cost a lot of manpower and material resources,which will seriously affect the normal operation of society and cause huge social losses.Therefore,earthquake resilient structures have attracted more and more attention on related scholars.Resilient shear walls structure,also known as self-centering shear wall structure,is a kind of earthquake resilient structures.The main problems currently studied on the Resilient shear walls structure are as follows: the connection between the wall and the foundation is weak,the overall performance of the structure is poor,it is difficult to repair and replace the energyconsuming reinforcement after yielding,the damper is used at the foot of the wall to provide energy consumption,and the cost is too high.In addition,the use of Carbon Fibre Reinforced Plastics(CFRP)reinforcement will limit the ductility and energyconsuming capacity of the shear wall itself.It is rare to apply the resilient shear wall to the frame shear wall structure,which means that the seismic performance evaluation and theoretical research of the frame resilient shear wall structure is not perfect.For the above problems,the main research contents of this paper are as follows:(1)Two kinds of resilient shear walls based on Ultra-High Performance Concrete(UHPC)are designed to complete the fabrication of test members,including processing energy-consuming steel bars,fabricating end anchorage members of CFRP bars,binding steel cages,placing and maintaining concrete,and tension pre-stressed steel strands.(2)Two UHPC-based resilient shear wall members are loaded into low-cycle reciprocating mode to study their failure phenomenon,hysteresis curves,frame curves,stiffness degradation,energy consumption,residual displacement,strain variation and deformation analysis.(3)Finite element software Open Sees is used to model and analyze the specimens.The model is verified by comparing the results of the test results.Based on this,the effects of parameters such as aspect ratio,axial compression ratio,initial prestress of steel strand and diameter of CFRP bars on the seismic behavior of UHPC-based recoverable functional shear wall are studied.(4)A 12-storey frame-shear wall structure is designed by using PKPM software.On this basis,the normal concrete shear wall of the structure is replaced by the two UHPC-based resilient shear walls to form three working conditions.Through the finite element software Open Sees,static elastic-plastic analysis,IDA-based vulnerability analysis and structural restorability analysis are carried out for the three structures.The seismic behavior of two UHPC-based resilient shear walls for frame-shear structures is studied.