Chung P.-TChou C.-C.CHUNG-CHE CHOU2022-03-222022-03-22202201410296https://www.scopus.com/inward/record.uri?eid=2-s2.0-85120482173&doi=10.1016%2fj.engstruct.2021.113634&partnerID=40&md5=93efe82a07a480fd68c18052622167c6https://scholars.lib.ntu.edu.tw/handle/123456789/598434This paper presents the evaluation of one-sided shear retrofit schemes for reinforced concrete (RC) coupling beams in existing buildings. Three full-scale beam Specimens CB1, CB2 and CB3 are planned for cyclic tests. Specimen CB1 represents a RC coupling beam in existing 24-story RC buildings, completed in Taiwan, 2017. Specimens CB2 and CB3 are retrofitted by added stirrups in the increased beam cross section and a bolted a steel plate from only one side of the RC beam, respectively. Test results showed that the shear strengths of the two retrofitted specimens exceeded the force of the RC coupling beam expected at the maximum considered earthquake (MCE) level. Specimen CB1 exhibited flexural-shear failure during the cycle of 5% drift. Specimens CB2 and CB3 exhibited shear failure during the cycle of 4% drift, and then concrete crushing associated with longitudinal bar buckling in the plastic hinge region. The peak shear forces of the added stirrups in Specimen CB2 and of the added steel plate in Specimen CB3 were 34 and 22% of the total shear forces, respectively, at large drifts. The added stirrups in the increased beam cross section provided larger shear force than the bolted steel plate. Both schemes were used to retrofit RC beams in the existing high-rise buildings in New Taipei City. ? 2021 Elsevier LtdAdded stirrupCyclic testOne-sided shear retrofitRC coupling beamSteel side plateConcrete beams and girdersReinforced concreteRetrofittingTall buildingsConcrete coupling beamsCyclic testsReinforced concrete beamsReinforced concrete couplingReinforced concrete coupling beamSide platesSteel platesCyclic loadsconcrete structurecyclic loadingearthquake engineeringfailure mechanismmultistorey buildingreinforced concreteseismic designseismic retrofitshear stressstructural componentTaiwan[SDGs]SDG11journal article10.1016/j.engstruct.2021.1136342-s2.0-85120482173