Large-Scale Cyclic Testing of Steel-Plate Shear Walls with Coupling

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Summary The steel plate shear wall (SPSW) system is a robust option for earthquake resistance due to the strength, stiffness, ductility and energy dissipation that it provides. Although thin infill plates are efficient for resisting lateral loads, boundary frames that are proportioned based on capacity design requirements add significant structural weight that appears to be one of the factors limiting the use of the system in practice. An alternate configuration, the SPSW with coupling (SPSW‐WC), was explored recently as an option for increasing architectural flexibility while also improving overall system economy and seismic performance. The SPSW‐WC, which extensively employs flexural boundary frame contribution, has shown promise in analytical, numerical and experimental studies, but recent research on uncoupled SPSWs suggests that boundary frame contribution should not be considered for carrying seismic design shear. As a result, in the present study, boundary frame contribution in SPSWs was explored with detailed three‐dimensional finite element models, which were validated against large‐scale SPSW‐WC tests. Six‐story systems were considered, and the study matrix included single and double uncoupled SPSWs along with coupled SPSWs that had various degrees of coupling. Variations in design methodology were also explored. The modeling framework was employed to conduct static monotonic and cyclic pushover analyses and dynamic response history analysis. These analyses demonstrate the beneficial effect of coupling in SPSWs and illustrate the need to consider boundary frame contribution in design of coupled SPSWs. In addition, sharing design shear between the infill plate and the boundary frame is more generally shown to not be detrimental if this sharing is done in the design stage based on elastic analysis and the resulting boundary frame provides adequate secondary strength and stiffness following infill plate yielding. Copyright © 2017 John Wiley & Sons, Ltd.

Section: Model Descriptionmentioning

confidence: 99%

Section: Prototype Designsmentioning

confidence: 99%

“…The material properties from tests in reference [12] were used in the models. The material properties from tests in reference [12] were used in the models.…”

Section: Prototype Designsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Boundary frame contribution in coupled and uncoupled steel plate shear walls

Wang

Borello

Fahnestock

2017

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Experimental investigations on seismic behavior and design of bottom vertical boundary elements in multi‐story steel plate shear walls

Tsai

et al. 2018

Summary This research investigates the seismic behavior and design method for the bottom‐level boundary columns, also called the vertical boundary elements (VBEs), in multi‐story steel plate shear walls (SPSWs). This paper firstly introduces the proposed design method for the bottom‐level VBE for the case when a frame swaying action causes the VBE to bend in single curvature, as is often seen in mid‐ and high‐rise buildings. Two 12‐story (12F) prototype SPSWs were designed using the proposed design method. Two 40%‐scale substructural test specimens representing the first 2.5 stories of the 12F SPSW prototype designs were cyclically tested with the Multi‐Axial Testing System at the Taiwan National Center for Research on Earthquake Engineering in 2013. The test results confirm the effectiveness of the proposed design method in predicting the yielding of the top end of the bottom VBE. In addition, test results show that the lateral torsional buckling of the bottom VBE could occur after the VBE top end yields, indicating that premature top‐end yielding should be prohibited for the bottom VBE before the SPSW develops uniform yielding mechanism under the lateral forces.

Seismic behavior of coupled steel plate shear walls with simple boundary frame connections

Gorji

Cheng

2018

Summary The coupled steel plate shear wall (C‐SPSW) configuration has been investigated by researchers as a means of improving the overturning stiffness and architectural flexibility of SPSW structures. While C‐SPSWs have been shown to exhibit excellent seismic performance, the fabrication cost associated with the high number of moment‐resisting connections used in such systems is a potential detraction to their use as an economical solution. Past research has shown that the hysteresis response of SPSWs with simple frame connections is significantly pinched, and as such, most seismic codes prohibit their use in high seismic areas. However, when used in the C‐SPSW configuration, a dual system is formed in which the coupling beams not only improve resistance to overturning but also provide substantial lateral strength and energy dissipation capacity. This paper presents an exploration of the potential to improve the economy of C‐SPSWs by using the simple boundary frame connections. First, employing the principles of plastic analysis, an attempt is made to quantify the contribution of the coupling beams to the overall lateral load resistance of the system. Then, to evaluate the seismic performance of such C‐SPSW systems and allow for the comparison with that of the C‐SPSWs with rigid frames, several prototypes are designed and analyzed using a series of nonlinear response history and pushover analyses. The results indicated that the C‐SPSWs with simple boundary frames exhibited satisfactory seismic performance comparable with that of the C‐SPSWs with rigid frames under both the 10/50 and 2/50 hazard levels, while allowing for reduced fabrication costs.