One-sided shear retrofit of reinforced concrete beams in existing high-rise buildings
Journal
Engineering Structures
Journal Volume
252
Date Issued
2022
Author(s)
Abstract
This 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 Ltd
Subjects
Added stirrup
Cyclic test
One-sided shear retrofit
RC coupling beam
Steel side plate
Concrete beams and girders
Reinforced concrete
Retrofitting
Tall buildings
Concrete coupling beams
Cyclic tests
Reinforced concrete beams
Reinforced concrete coupling
Reinforced concrete coupling beam
Side plates
Steel plates
Cyclic loads
concrete structure
cyclic loading
earthquake engineering
failure mechanism
multistorey building
reinforced concrete
seismic design
seismic retrofit
shear stress
structural component
Taiwan
SDGs
Type
journal article