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Response of nonconforming RC shear walls with smooth bars under quasi-static cyclic loading

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Abstract

In this study, an experimental investigation is conducted to determine the behavior of RC shear walls found in old and existing buildings that do not comply with the design rules in modern earthquake standards. Scaled reinforced concrete shear wall specimens are built with smooth bars and low concrete quality. The dimensions of the shear wall specimens were selected with an aspect ratio bigger than two as 2500, 1050, and 150 mm for the height, length, and thickness, respectively. Four specimens are representative of nonconforming shear walls, and one wall is used as a reference specimen which was designed in accordance with recent building codes using deformed bars. The behavior of the shear walls is determined experimentally by displacement-lateral load relationship under lateral cyclic loading. The study used measurable parameters to investigate the behavior of the test specimens in terms of lateral force capacity, rigidity, ductility, dissipated energy, and displacement components contribution to the total lateral response of the walls. The results showed a substantial loss of stiffness, ductility and energy dissipation capabilities for the tested nonconforming shear walls. Moreover, it is proven in this study that these specimens are governed by the bar slip phenomena which demonstrated more than 80% contribution to the total lateral displacement capacity. In contrast, the reference shear wall exhibited a notable flexural behavior and plastic hinge formation. Additionally, the shear walls built with smooth reinforcement bars lost about 44% of their theoretical potential flexural capacity due to the observed bar slip failure.

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Acknowledgements

The authors would like to acknowledge the assistance of the staff of the Structural-Mechanics Laboratory at Düzce University during the experimental study phase of this work which is greatly appreciated.

Funding

This study was financially supported by the Scientific and Technological Research Council of Turkey (TÜBİTAK) under the 1002 Short Term R&D Funding Program with Project no: 119M728. This work was conducted during the first author’s doctoral scholarship funded by the Presidency for Turks Abroad and Related Communities (YTB) under Turkey Scholarships program.

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Contributions

M.N.O.: Conceptualization, Methodology, Investigation, Visualization, Formal analysis, Writing—original draft, Writing—review & editing. N.C.: Conceptualization, Methodology, Investigation, Funding acquisition, Writing—original draft, Writing—review & editing, Supervision. M.E.A.: Conceptualization, Methodology, Investigation, Resources, Writing—review & editing. H.O.: Methodology, Writing—review & editing. A.D.: Methodology, Writing—review & editing. G.D.: Methodology, Writing—review & editing. B.A.: Methodology, Writing—review & editing.

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Correspondence to Naci Caglar.

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The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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Olabi, M.N., Caglar, N., Arslan, M.E. et al. Response of nonconforming RC shear walls with smooth bars under quasi-static cyclic loading. Bull Earthquake Eng 20, 6683–6704 (2022). https://doi.org/10.1007/s10518-022-01451-7

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