Research On Seismic Behavior Of High Strength Concrete Composite Shear Wall With Double Steel Plates

A large number of high-rise buildings in China adopt frame-core tube structure system，in which shear wall of core tube is the most important in the lateral force resisting members.This paper presents a new type of High Strength Concrete Composite Shear Wall with DoubleSteel Plates（BCSW），and analyses the anti-seismic performance of the wall by test and thefinite element method.BCSW finite element analysis model was created by software ABAQUS. Monotonicload was conducted on models to study the differences of the shear performance of BCSWwith different of shear span ratio and axial compression ratio through the nonlinear finitemethod. The results show that, outer steel plates can provide strong constraints on theconcrete and delay the development of cracks in concrete. Through using BCSW as the lateralforce resisting members of high-rise buildings, the shear span ratio comparing withhigh-strength concrete shear wall can be relaxed. BCSW was influenced by the axialcompression ratio significantly. Increasing the vertical load, the lateral stiffness and bearingcapacity of BCSW are improved, and there are varying degrees of declining segments afterthe peaks, but the ultimate displacement and the ductility were decreased. Square steelconceal column could strengthen the constraints of wall limb, and effectively improve thebearing capacity and ductility of high strength concrete composite shear wall.BCSW was conducted low cycled reversed loading experiment. It explored the impact ofvarious factors on BCSW，and provided meaningful basis for BCSW simplified calculationand performance-based seismic design method. The test showed that, failure mode of BCSWwas local buckling of the corner of steel plate and subsequent concrete crushing. Comparingwith high-strength concrete shear wall, pinch phenomenon of hysteresis curve of BCSW wasreduced, energy consumption was improved, and carry capacity and stiffness degradationwere reduced. With high axial load, carry capacity of BCSW was increased, but decreasedmore rapidly after peak, and carry capacity and stiffness degradation were increased evenmore serious. Configuration reinforced to concrete of wall could improve the mechanical performance of BCSW.