High-Rise Reinforced Concrete Buildings Retrofitted by Using Steel Double K-Braced Frame and One-Sided Shear Strengthening Schemes
Journal
12th National Conference on Earthquake Engineering, NCEE 2022
Date Issued
2022-01-01
Author(s)
Abstract
This paper presents the seismic evaluation of using a steel double K-braced frame and one-sided shear retrofit schemes to retrofit existing reinforced concrete (RC) social buildings in Banqiao district, Taiwan. A total of 37 social buildings showed minor damage in 2015 Hualien Earthquake with a magnitude of 6.3. The steel K-braced frame and the one-sided shear retrofit schemes were used to enhance the shear strengths of short columns and coupling beams, respectively. Cyclic tests were conducted on a full-scale steel double K-braced frame specimen and three RC beam specimens. Two beam specimens were retrofitted by an increased cross section and a bolted steel plate from only one side of the RC beam, respectively. The double K-braced frame failed due to significant buckling of braces and frame elements at 3% drift. Two retrofitted beam specimens exhibited shear failure at 4% drift cycle, and then concrete crushing associated with longitudinal bar buckling in the plastic hinge region. These retrofit schemes were verified to enhance the shear strength of RC columns and beams to meet seismic demands of the buildings, obtained from nonlinear time-history analyses of a frame.
SDGs
Type
conference paper