Seismic Performance Analysis Of Bi-direction-slotted SPSW

The steel plate shear wall has increasingly been concerned and put into practice because of its excellent seismic performance. With the development of technology, there are a growing number of superior and innovative types of steel plate shear wall. This paper presents a new type of steel plate shear wall called bi-direction-slotted SPSW(SPSWs).The two layers of steel plates with inclined slotted holes are installed reversely in the slots’direction through adhesive bonding. By the inclined slots on the steel plates, the complex bearing mode of the steel plate has been changed and forms the tensile-compressive mode in the steel strips. In this way, the earthquake energy can be steadily dissipated through bearing the tensile-compressive forces and the adjustable parameters are increased in engineering design. In addition, under the reciprocating loading, the two-layered steel plate is always bearing the mode of "one tensile force while one compressive force". The plates that are in tension provide structural out-of-plane support for the compressive plates. It improves the buckling bearing capacity of the infill plates and achieve the effect of self anti-buckling. The main works in this paper are as follows:1) The complex bearing mode of the infill plates can be changed by the inclined slots on the plates, the suitable edge distance Δ can contribute to the tensile-compressive bearing mode of the inclined-slotted steel plates.2) By using ABAQUS finite element software to compare the unrestrained SPSWS with the ordinary thin steel plate shear wall, the results showed that:though the ultimate shear capacity, lateral stiffness and energy dissipation of the unrestrained SPSWs are relatively low, there are some advantages in practice. The pinch effect on the hysteretic curve of the unrestrained SPSWS is relatively slight and the disadvantageous effect of the infill plates on fringe frame is low. Therefore, it is easier to achieve the design principle of " strong frame and weak steel plate". Also because of the superior ductility, it is an excellent new type energy dissipated construction member.3) Using ABAQUS finite element software, through the parameter analysis on the hysteretic behavior of the unrestrained SPSWS, the results showed the effects of two new design parameters. Besides, to understand the seismic behavior of the SPSWS without out-of-plane buckling, the analysis on the hysteretic behavior of the buckling-restrained SPSWS provides evidence. The results showed that with the slot interval increases, the capacity of energy dissipation of the unrestrained SPSWS weakens and the energy dissipation efficiency declines. And with the strip width increases, the capacity of energy dissipation of the unrestrained SPS Ws enhances and the influence on energy dissipation efficiency reduces. The SPSWS is a superior new type energy dissipated construction member, the SPSWsi with good energy dissipation can be adopted in low-intensity seismic area while the SPSWSII which has superior lateral stiffness, capacity and energy dissipation can be adopted in high-intensity seismic area.4) The theoretical analysis and finite element analysis are conducted to the study on the buckling-restrained be-direction-slotted SPSW(SPSWSII. The results showed that comparing with ordinary thin steel plate shear wall and unrestrained be-direction-slotted SPSW, the disadvantageous effect of the infill plates of buckling-restrained be-direction-slotted SPSW on fringe frame is relatively low and it reduces the disadvantageous effect of the infill plates on the seismic behavior of the structures. The theoretical analysis of the additional distributed forces of the infill plates on fringe frame in the SPSWSII reflects the additional distributed forces of the infill plates on each member of the fringe frame and it shows that the forces are larger in the ends of the members. The infill plates in the SPSWSII have stable bearing capacity after yielding and good ductility. The shear capacity-story displacement curve is bilinear. The formula (5-7) can be used as the theoretical calculation formula of the ultimate shearing capacity of SPSWSII infill plate in engineering design. When the infill plate is thin, the formula (5-10) can be used as the theoretical calculation formula of its elastic lateral stiffness.