Study On Seismic Behavior Of Concrete-filled Rectangular Steel Tubular Frame-cross Stiffened Thin Steel Plate Shear Wall With Trough Bolts-endplate Connection

Thin Steel plate shear wall(SPSW) mainly depends on post buckling strength to provide lateral bearing capacity and stiffness to construction.This structure has excellent ductility, splendid energy dissipation and outstanding seismic capability.SPSW is a new component to resist lateral force, which has a good application prospect. Set cross stiffeners can not only improve mechanical properties of thin SPSW but relieve outside deformation as wall.Using concrete-filled square steel tubes as the vertical boundary elements of the SPSW can provide enough protection to SPSW to spread tension field fully.This combination can sufficient develop the structural behavior which bond the advantages of two structure elements.Bolts-endplate connection has better mechanical properties and construction performance than traditional concrete filled steel tubular node.By using experimental research and theoretical analysis, this dissertation study on the seismic behavior of concrete-filled rectangular steel tubular frame-cross stiffener thin steel plate shear wall with through bolts-endplate connection. The main contents are listed as follow:(1)The low cycle loading tests conducted on two 1/3 scaled one-bay two-story experimental specimens with different beam-to-column node designed as thin steel plate shear walls within concrete filled square steel tubular frames,which is compared with the un-stiffened SPSWs. The influence of inner diaphragm connection and through highstrength bolts-endplate beam-to-column connection on the structural performance is investigated. The failure pattern, load-displacement hysteretic curves, skeleton curves,the characteristic load and displacement values, and aseismic behavior indexes are obtained. The failure characteristics, ductility, energy dissipation capacity, load carrying capacity and stiffness degeneration are studied. Experimental results show that the concrete filled square steel tubular frame-thin steel plate shear walls exhibit favorable aseismic behavior. The cross stiffeners restrict the out-of plane deflection of the SPSWs,improve the bearing capacity and energy dissipation capacity,but have little effect on the stiffness. The through bolts-endplate connection enhance the load carrying capacity and stiffness of construction.(2)Finite elements analyses on the behavior of three experiment specimens were conducted by using the ABAQUS6.10. The numerical analysis and the results of test are mainly matched which shows that the method of modeling is efficient.Based on the results of numerical analysis,the stress and strain development and failure mechanism of the SPSWs were investigated.(3)The result of finite elements analyses shows that the pinch of hysteresis curve which appear in reality test cannot be reflected truthfully. The test analyze sorts of different factors to find the reason that impact ABAQUS calculated hysteretic curve.The results show that software will introduce damping energy to help the calculation convergence, but the hysteresis curve will slightly satiation. This error cannot be neglected for SPSWs. Some exploration and suggestion have been put to solve the problem which can be used to SPSWs’ research and design in future.