The Research Of Vertical Stiffened Steel Plate Shear Wall Considering The Vertical Load

The effective double lateral resistant structure system of steel frame embedded steelplate shear wall with superior energy dissipation capacity and good ductility has a goodprospect of application in high-rise buildings in the earthquake region. By adding stiffeners,it can increase the initial stiffness and buckling bearing capacity of steel plate shear wall(SPSW), mitigate the pinch of hysteresis curves, and is widely adopted for practicalengineering. However, the current specification which has few provisions for stiffenedSPSW is insufficient to guide the practical engineering design. Based on theoretical analysisand experimental study and numerical analysis, the vertical stiffened SPSW is studied withconsidering limited vertical load. And the main characteristic works are as follows:(1) Three1/3scaled stiffened SPSW specimens were designed, and tested respectivelyby monotonic loading and cyclic loading. The test results showed that the specimensoccurred local buckling in panels first, then failure in overall buckling. Before the panelsbuckling, the vertical stiffener stress was smaller, but it would increase drastically afterbuckling and failure in local instability finally. The effects of the limited vertical load on thelateral stiffness, skeleton curves, yield carrying capacity and ultimate bearing capacity weresmaller.(2) The reasonable refinement finite element model was established and simulated.Compared with the test results, the finite element model could better simulate SPSWbehavior in monotonic loading and cyclic loading. The effects of different amounts ofvertical load on SPSW performance was investigated, and results showed that vertical loadwould significantly reduce the ultimate strength and ultimate displacement of SPSW, but alittle effect would be on the initial stiffness. In cyclic loading, the vertical load would havesmaller effect on initial secant stiffness of SPSW and greater effect on late secant stiffness.The limited vertical load was basically no effect on the performance of SPSW.(3) The perfect vertical stiffened SPSW with simply supported under pure shear wasresearched on stiffener threshold stiffness and elastic buckling stress. The results showedthat it had better accuracy to design SPSW vertical stiffener by using the design calculationformulas for transverse stiffener of plate girder. Analyzed the sensitivity of the initialimperfection of the vertical stiffened SPSW, and performed nonlinear buckling analysiswith considering initial buckling imperfection. The analysis results showed that the initial buckling imperfection had greater impact on buckling loads, and the stiffener thresholdstiffness should be enlarged.(4) The elastoplastic buckling behavior of SPSW was researched by using the finiteelement method. Formulas which had higher accuracy and easy to engineering design werefitted to calculated elastoplastic buckling and post-bucking behavior of SPSW with simplysupported under pure shear.