Seismic Design and Tests of Perforation and Restrainer in Steel Plate Shear Walls
Date Issued
2015
Date
2015
Author(s)
Huang, Tung
Abstract
Steel Plate S hear Wall (SPSW) is a new type of steel structural seismic system, which has been recognized having high lateral stiffness and ductility. It has gained significant acceptance in the U.S, Canada, and Japan in recent years. However, it has not been adopted wildly in Taiwan for practical use. This could be due to the following reasons: (1) The capacity design of boundary elements requires the complex and time-consuming analysis of a strip model. (2) According to the Seismic Provisions for Structural Steel Buildings, the plastic hinge in the 1st story column is only allowed to form at the bottom end. Consequently, it often leads to a very conservative and uneconomic column design. (3) The steel panel often occupies an entire vertical area in a frame, and not flexible from an architectural point of view. Restrainers in the Restrained SPSWs (R-SPSWs) are horizontally placed between two columns to help boundary columns and beams in resisting tension field action. Restrainers can significantly reduce flexural moment demands on boundary columns thereby allowing engineers to design SPSWs in a more robust and economic way. This study proposes the capacity design methodology for the R-SPSWs. Perforated SPSWs (P-SPSWs) provide utility passages, which will increase architecture flexibility. Besides, if all of the available steel panels are too strong or too thick for specific design requirements, perforation can reduce panel strength and achieve the economic design. This study conducts a series of ABAQUS model analyses and carries out linear regression analysis on these analytical results. A more accurate method is proposed for estimating panel strength, and a simplified design procedure is provide for the design of P-SPSWs. In order to verify the design methodology and the seismic performance of R-SPSWs and P-SPSWs, a full scale 2-story C-type 3D-SPSWs specimen was tested in NCREE in collaboration with another graduate student, Ms. Yi-Hsuan Yang. The specimen consists of one 5-meter long SPSW in the longitudinal side and two 2-meter wide R-SPSWs in the transverse side. The 1st story is 3.41 meter high and using 2.6 mm-thick low yield steel panel. The 2nd story is 3.28 meter high and adopting perforated panel with a strength-equivalent thickness of 1.8mm. In addition, this study conducts numerical analyses using ABAQUS shell and PISA3D strip models to predict the responses of the specimen. Cyclic loading test results show that the maximum positive and negative roof drift ratios are +3% and -5%, respectively. Tests also confirm that the design methodology can satisfactorily predict the location of in-span plastic hinges, the force demands on the restrainers, and the strength-equivalent thickness of the perforated panel. Therefore, the proposed design methodologies for the R-SPSWs and P-SPSWs are proved to be practical and useful.
Subjects
steel plate shear wall
restrained steel plate shear wall
perforated steel plate shear wall
boundary column
restrainer
capacity design
seismic design
Type
thesis
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