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Title: Seismic Strengthening of Shear Walls Using Wire Ropes as Lateral Reinforcement

Author(s): Keun-Hyeok Yang, Hyuck-Jin Kwon, and Seung-Jun Kwon

Publication: Structural Journal

Volume: 115

Issue: 3

Appears on pages(s): 837-847

Keywords: ductility; jacket section; lateral reinforcement; seismic strengthening; shear wall; wire rope

DOI: 10.14359/51701148

Date: 5/1/2018

Abstract:
This study proposed a practical strengthening technique for enhancing the seismic behavior of reinforced concrete shear walls using prestressed wire ropes as a lateral reinforcement at the wall boundary elements. An unstrengthened wall and six strengthened walls were tested under constant axial load and cyclic lateral loads to explore the significance and feasibility of the developed seismic-strengthening procedure. The main variables investigated were the amount of wire rope and height of the jacket section for strengthening. Test results revealed that the shear walls strengthened with wire ropes in their boundary elements had better buckling resistance of longitudinal reinforcement and ductility behavior than the non-seismic shear wall. Unlike the brittle behavior of the unstrengthened wall, the strengthened walls exhibited a highly enhanced ductile pattern in a lateral load—lateral displacement relationship. Thus, the strengthened walls achieved the displacement ductility ratio capacity required for the design of a medium ductility shear wall. In particular, the strengthened wall with a lateral reinforcement index of 0.174 met the minimum displacement ductility ratio requirement for a highly ductile shear wall. Considering the enhanced flexural behavior, including the strength, stiffness, and ductility, along with the construction efficiency, a recommendation could be made that the height of the jacket section when strengthening shear walls not exceed 0.76 times the wall height. Ultimately, the developed strengthening approach showed significant potential in enhancing the flexural stiffness, strength, and ductility of existing non-seismic shear walls.