Seismic behavior of foam-infilled corrugated CFRP-steel composite panel shear wall
When using FRP-steel composite panels instead of pure steel plates are used as shear wall panels in steel frame-steel plate shear walls,the tensile field effect is enhanced.However,the ductility of the structure is reduced,due to the limited tensile strain of the fibers.To address this issue,filling PET foam between the FRP and inner steel plate was proposed to improve the ductility and out-of-plane bending stiffness of the shear panel.Quasi-static test studies on two 1/3 scale shear wall specimens with hinged rigid frame were completed to investigate the effects of FRP corrugated panels and PET foam on the seismic performance,where the wall panels were made of pure steel plates and form-infilled CFRP-steel composite panels,The study demonstrated that filling PET foam between CFRP and steel plates effectively reduces the strain of CFRP in the limit state,thereby enhancing the ductility of the wall panels.Additionally,the use of CFRP-steel composite panels increases the initial stiffness,peak load,and accumulative energy dissipation by 32.11％,36.39％,and 105.93％,respectively,compared to a pure steel plate shear wall.The theoretical analysis on the tensile and shear bearing capacities of CFRP-steel composite panels was conducted.Furthermore,a structural restoring force model was proposed and its accuracy was verified through comparison with test results.The maximum errors of the initial stiffness and the bearing capacity within the drift of 2％are 6.0％and 5.8％,respectively.The stress and deformation modes of each component were studied through finite element simulation.The stress of CFRP in the shear wall was concentrated in the bolt area,and local failure occurred near the washer plate.To avoid local failure of CFRP and improve its stress level,full-length washer plates and a fiber ply scheme of±45° are recommended.
steel plate shear wallfiber reinforced polymerseismic behaviorrestoring force modelductility design
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