Research on Seismic Design of Three Dimensional Steel Plate Shear Walls
Date Issued
2014
Date
2014
Author(s)
Yang, Yi-Hsuan
Abstract
Steel plate shear walls (SPSWs) have been recognized as a steel structural system with high lateral stiffness and ductility. Past studies on the horizontal boundary elements(HBEs) in SPSWs were focused on the steel wide flange sections. Due to the panel tension filed action, the top boundary beam in a SPSW is subjected to a positive bending moments near the beam mid-span, since concrete slab exists in building structures, the composite action of the concrete slab and steel beams may reduce the requirements of the steel beams size. In order to investigate the effects of composite action in the top boundary beam of SPSW, ABAQUS finite element model (FEM) analysis is conducted. Analysis results show that the composite effect is not pronounced since the vertical downward panel forces are applied on the beam bottom flange. The concrete slab only provides a small contribution on the positive bending moment capacity when the steel beam reaches the ultimate state. Therefore, it is concluded that only the steel section without the composite action be considered in the design of the top HBEs.
The lateral force resisting systems in building structures are usually designed separately for two orthogonal directions. The three dimensional steel plate shear wall (3D-SPSW) systems can be configured by using more than one SPSW in two different directions. It could be constructed around the stair or elevator cases in a building to resist the biaxial lateral forces effectively. In this study, the equivalent brace models are incorporated into a simplified procedures to estimate the biaxial force demands in the 1st story column of a 3D-SPSW. The proposed capacity design method for the column considers the relationships among the axial force, biaxial bending moments and shear induced from both the frame and panel actions. In order to examine the effectiveness of the proposed capacity design method, ABAQUS FEM analyses of five 2-story L-type 3D-SPSWs systems are conducted. Analytical results confirm that the biaxial moment distribution in 1st story column can be accurately estimated by the proposed design method.
In order to investigate the seismic responses of the 3D-SPSW under the biaxial earthquake load effects, a full scale 2-story C-type 3D-SPSW specimen was tested in National Center for Research on Earthquake Engineering in collaboration with another graduate student, Mr. Huang Tung. In the longitudinal direction, it is a typical 5-meter wide SPSW, while in the transverse direction, there are two 2-meter wide restrained SPSWs. The story heights are 3.41m and 3.28m for the 1st and 2nd stories, respectively. The 2.6mm-thick low yield strength steel plates were adopted. In order to match the force capacity of the actuators, the steel plates in 2nd story are perforated to a strength equivalent to a 1.8mm-thick low yield strength plate.
Results of the pushover analyses on FEMs and the cyclic loading tests up to a roof drift of 0.025 radians confirm that the proposed capacity design method are suitable for the seismic design of 3D-SPSWs. The nonlinear responses of the 1st story column can be accurately predicted by the proposed design procedures.
Subjects
鋼板剪力牆
束制型鋼板剪力牆
合成梁
耐震設計
容量設計
雙向地震
軸彎互制
Type
thesis
File(s)![Thumbnail Image]()
Loading...
Name
ntu-103-R01521226-1.pdf
Size
23.32 KB
Format
Adobe PDF
Checksum
(MD5):83a3d5dcd35044fa17e635b47335c85a