Studies On Behavior Of Buckling-restrained Slotted Steel Plate Shear Wall

As an pivotal issue in the design procedure of high-rise steel buildings,lateral-force resisting and energy-dissipation component has always been asignificant problem. An innovative one, namely Buckling-Restrained Slotted SteelPlate Shear Wall (BR-sspsw) was proposed and studied: It is composed of steelframe, infill steel plate which has some slots arranged in oblique direction andencasement of pre-casted RC cover plates on both sides. the two pieces of concreteplate is connected by bolts distributed in the slots so they can restrain the slottedsteel plate from buckling. In this way, the diagonal distributed steel bars candissipate input earthquake energy through bearing the tensile force or compressiveforce. The system has a clear bearing mechanism, and is very convenient toparametric design. The main works are listed as follows:(1) Formulate for calculating the ultimate shear capacity and initial stiffness isderived based on the typical collapse mechanism of the BR-sspsw. FEM is employedto verify the theoretical formula. After determining the simple slot form, the internalforce distribution and development process of the slotted steel plate and framecolumn is studied and compared with the ordinary thin steel plate shear wall usingANSYS finite element software. Results showed that BR-sspsw can work inpredetermined collapse mechanism, and the theoretical results agree well with thefinite element analysis results.(2) A detailed parameter study is carried out to investigate the influence of thefollowing factors to the behavior of BR-sspsw, including span-to-heightratio,height-to thickness ratio, the elastic stiffness of the frame column. The resultindicate that the ultimate capacity, initialstiffness is in a linear relationship withspan-to-height ratio, and they decreased significantly with the increase of theheight-to thickness ratio, closing to the theoretical value. Stiffness of the framecolumn plays a key role on the behavior of the BR-sspsw.Through the analysis ofparameters like slot width, steel bar width, number of slot, proved the feasibility ofparametric design.(3) Finite element model is established, and in this model the reciprocity oftwo plates is considered by the contact method.The effects of gapbetween the slottedsteel plate and the cover concrete plate on each side, thickness of the concrete plate,layout of the connection bolts, the concrete strength and frictional action on thebehavior of BR-sspsws have been investigated. The analysis results show that thegap between two plates should be small as possible, the concrete plates can prevent the out-of-plane buckling of the diagonal distributed steel bars, layout of theconnection bolts plays an important role in preventing the out-of-plane buckling ofthe diagonal distributed steel bars as well.The corresponding designrecommendation is given.A three-span ten-story BR-sspsw prototype structure is strictly designed basedon the shear capacity of the BR-sspsw. Then finite element models is established byOpenSees program with simplified elements. Nonlinear static pushover analysis anddynamic analysis are performed to get the performance of the structure and responseunder earthquake. The result shows that the BR-sspsw enter the yield status in thefirst place, undertaking most of the shear and dissipating lots of energy. It can worktogether with surrounding framework, the whole structure has a excellent ductility.