Browsing by Author "Clayton, P."

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Strip model for steel plate shear walls with beam-connected web plates
(National Technical University of Athens, 2019) Özçelik, Ahmet Yiğit; Clayton, P.; Civil Engineering; Papadrakakis, M.; Fragiadakis, M.; ÖZÇELİK, Ahmet Yiğit
Steel plate shear walls (SPSWs) are a lateral force-resisting system in which thin infill plates (web plates) are connected to the boundary frame (i.e., beams and columns) along four edges. Despite shear buckling of thin plates upon lateral loading, web plates still provide lateral strength and stiffness in the post-buckling range owing to a mechanism called tension field action. The boundary frame (particularly columns) needs to satisfy stringent strength and stiffness requirements to anchor the inclined forces in web plates resulting from tension field action. An alternative system to conventional SPSWs, steel plate shear walls with beam-connected web plates (B-SPSWs), is proposed in the literature where web plates are connected to beams only. Therefore, high flexural and axial load demands in columns induced by tension field forces are eliminated. However, due to the difference in boundary conditions of web plates, the load path of steel plate shear walls with beam-connected web plates significantly differs from that of conventional SPSWs. In this study, a simplified strip model of beam-connected web plate is proposed to simulate the cyclic behavior of beam-connected web plates. As it is typical and conservative to ignore the compressive strength of strips, strip models underestimate the strain energy dissipated under cyclic loading. An equation for the compressive strength of strips is proposed to accurately capture the energy dissipation capacity of beam-connected web plates. A three-way comparison between the proposed strip model, a strip model from the literature, and a validated continuum model is provided. The results reveal that the proposed strip model is capable of successfully estimating the boundary frame demands, lateral load capacity, and energy dissipation of beam-connected web plates.
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Tension field inclination angle in steel plate shear walls with beam- connected web plates
(National Technical University of Athens, 2019) Özçelik, Ahmet Yiğit; Clayton, P.; Civil Engineering; ÖZÇELİK, Ahmet Yiğit
Steel plate shear walls (SPSWs) are an efficient lateral force-resisting system with thin infill plates, main elements resisting the lateral force, connected to beams and columns on all four edges. Upon lateral loading, thin infill plates (also known as web plates) buckle almost immediately; however, the lateral stiffness and lateral strength of SPSWs are maintained due to a mechanism called tension field action. Steel plate shear walls with beam-connected web plates (B- SPSWs) are an alternative SPSW configuration where the web plates are detached from columns and connected to beams only. As opposed to conventional SPSWs where the full tension field is observed, a partial tension field is developed in the web plates of B-SPSWs due to the difference in connectivity which alters the system behavior significantly. As SPSWs are typically modeled using simplified strip models in which the accurate determination of the tension field inclination angle is of paramount importance, an analytical study is undertaken to quantify the partial tension field inclination angle. Using validated finite element models, beam-connected web plate behavior is characterized, and an equation is proposed for the partial tension field inclination angle.