Study on elastic buckling and seismic behavior of two-side connected stiffened shear wall with FRP-laminated steel composite plate

Abstract

To reduce the additional bending moments generated from the wall plates to the vertical boundary members and to maintain the high level of the structural seismic performance, this paper proposes a two-side connected stiffened shear wall structure with FRP-laminated steel composite plate by introducing the concepts of stiffened dividing grid and steel plate lamination. The corresponding stiffener design method is established, in which the calculation method of shear buckling coefficient for the two-side connected laminated steel plate shear walls (SPSWs), and two-side connected shear wall with FRP-laminated steel composite plate is proposed by finite element (FE) eigenvalue elastic buckling analysis. Subsequently, the specimens of two-side connected stiffened shear wall with laminated steel plate and two-side connected stiffened shear wall with CFRP-laminated steel composite plate are designed, and their seismic performance are compared by quasi-static cyclic loading tests. The test results indicate that the yield bearing capacity, peak bearing capacity, cumulative energy dissipation, and initial stiffness of the structure are increased by 39.06 %, 33.95 %, 20.40 %, and 38.31 %, respectively, by laying the ± 45° CFRP externally and locally laying the corners with 0° CFRP in two-side connected stiffened shear wall with laminated steel plate. Using CFRP reinforcement reduces the maximum out-of-plane deformation of pure steel shear wall by 88.57 %. This shows that arranging ± 45° CFRP layers can effectively restrain the out-of-plane buckling deformation of the wall plates.