Browsing by Author "Clayton, P. M."

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Behavior of columns of steel plate shear walls with beam-connected web plates
(Elsevier, 2018-10-01) Özçelik, Ahmet Yiğit; Clayton, P. M.; Civil Engineering; ÖZÇELİK, Ahmet Yiğit
Steel plate shear walls with beam-connected web plates (B-SPSWs) are an alternative configuration of steel plate shear walls (SPSWs) where web plates are connected to the beams only. Detaching web plates from columns and introducing simple beam-column connections in B-SPSWs eliminate flexural demands in the columns resulting from web plate tension field action; consequently, the columns of B-SPSWs are designed primarily for axial loads. A recent study, however, showed that the columns of B-SPSWs resist significant flexural demands during earthquake shaking due to differential interstory drifts that result in significant column rotations at floor levels. Typical design methods (i.e., the Equivalent Lateral Force method and Modal Response Spectrum analysis) do not capture these rotations associated with differential drifts that might lead to column instability. A two-phase numerical study is conducted to evaluate the behavior and stability of B-SPSW columns. In the first phase, three-dimensional nonlinear response-history analyses are conducted to investigate the column stability for eighteen B-SPSWs with different geometric characteristics designed following two design approaches. The results suggest that column buckling is a possible mode of failure for one of the design approaches. In the second phase, a parametric study is undertaken to further investigate potential column buckling failure modes in B-SPSW columns and to establish an upper-bound estimate for the column buckling strength reduction due to column rotations at floor levels that are not considered in traditional design approaches.
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Effect of flexural demands in the leaner columns on the column buckling strength
(Earthquake Engineering Research Institute, 2018) Özçelik, Ahmet Yiğit; Clayton, P. M.; Civil Engineering; ÖZÇELİK, Ahmet Yiğit
Leaner columns of steel frames are typically designed for axial load only and they are assumed not to contribute to the lateral stiffness of the system; however, a recent study revealed that under seismic loading leaner columns underwent significant flexural demands due to differential interstory drift demands along the building height that were not observed when traditional design methods were adopted. A parametric numerical study is conducted to quantify the reduction in column buckling strength due to these flexural demands that are not considered in design. An empirical column buckling strength reduction factor that accounts for the reduction in the column buckling strength due to flexural demands is proposed. This reduction factor can be easily implemented with traditional design approaches without considering the flexural demands in the leaner columns explicitly.
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Seismic design and performance of SPSWs with beam-connected web plates
(Elsevier, 2018-03) Özçelik, Ahmet Yiğit; Clayton, P. M.; Civil Engineering; ÖZÇELİK, Ahmet Yiğit
Steel plate shear walls with beam-connected web plates (B-SPSWs) are an alternative steel plate shear wall (SPSW) configuration in which the web plate edges are detached from the columns to avoid high flexural demands in the columns resulting from tension field action. Releasing the columns from the web plates results in development of a partial tension field instead of the full tension field observed in conventional SPSWs, which changes system behavior and member demands significantly. A numerical study is undertaken to assess the seismic performance of B-SPSWs designed for low-seismic regions. Equations for the web plate lateral strength and the beam axial force, shear force, and moment demands are provided. Following two design approaches, eighteen B-SPSWs possessing different geometric characteristics are designed based on the provided equations. Each B-SPSW is subjected to forty ground motions representing two seismic hazard levels. The seismic performance of these B-SPSWs is evaluated based on maximum interstory drifts, member demand-to-capacity ratios, and beam-column connection rotations. The results indicate that B-SPSWs show a promising seismic behavior and may be particularly attractive lateral force-resisting alternatives for regions of low and moderate seismicity. (C) 2017 Elsevier Ltd. All rights reserved.