Study On Seismic Performance Of RC Shear Walls With Embedded FCCCs

In the present dissertation,a novel composite shear wall consisted of fiber reinforced polymer(FRP),steel and concrete is proposed: the composite shear wall with built-in FRP confined concrete cores.The FRP confined concrete core(FCCC)components include FCCC-O(FCCC-Original),FCCC-R(FCCC-Rebar)and FCCC-PR(FCCC-Prestressed Rebar).The use of FCCCs in RC shear walls can reduce the axial compression ratio of shear walls,change the brittle failure mode,increase the deformation capacity at high axial compression ratios,and improve the collapse resistance of the members in the ultimate state.In this dissertation,the seismic performance of the composite shear walls with built-in FCCC components were investigated experimentally and theoretically.In order to investigate the structural performance of FCCC components,axial compression and shear tests were first carried out on 30 FCCC columns and 28 FCCC beams,respectively.The failure modes of embedded assemblies in shear walls were studied under axial compression or shear force.The key design parameters were analyzed,including the material properties of FRP and the strength of concrete.The design-oriented models for FCCCs subjected to axial compressive load were also investigated,and the design formula for calculating the shear capacity of the FCCCs was proposed.To further study the structural performance of RC shear walls reinforced with FCCC components,quasi-static compression tests were conducted on 8 high-rise shear wall specimens and 9 squat shear wall specimens.The failure mode and hysteretic behavior of the RC shear walls with FCCCs were obtained,and the load-carrying capacity,ductility,stiffness degradation,deformation capacity,energy dissipation capacity and strain development of the composite shear walls were analyzed.In addition,a numerical analysis model of the composite shear wall was established via Open Sees.Based on the experimental tests and numerical simulations,the effects of cross-sectional area of the FCCC,the axial compression ratio,the concrete strength inside and outside the FRP tube,the longitudinal reinforcement ratio,and the stirrup configuration of the boundary members were analyzed and discussed.Based on above studies,the prediction methods of load-carrying capacities of highrise and squat shear walls reinforced with FCCC components were established based on the plane section assumption and the simplified strut-and-tie model,respectively,which can support the structure design of the FCCC-reinforced composite shear walls.In addition,a four-line backbone model was established according to the quasi-static test data.The backbone curves were obtained from the load-carrying capacity prediction methods and test data.The predicted backbone curves were in good agreement with the test results.