Abstract
Many structural retrofitting methods tend to only focus on how to improve the strength and ductility of structural members. It is necessary for developing retrofitting strategy to consider not only upgrading the capacity but also achieving rapid and economical construction. In this paper, a new retrofitting details and technique is proposed to improve structural capacity and constructability for retrofitting reinforced concrete beams. The components of retrofitting are prefabricated, and the components are quickly assembled using bolts and chemical anchors on site. The details of modularized steel plates for retrofitting have been chosen based on the finite element analysis. To evaluate the structural performance of concrete beams retrofitted with the proposed details, five concrete beams with and without retrofitting were tested. The proposed retrofitting method significantly increased both the maximum load capacity and ductility of reinforced concrete beams. The test results showed that the flexural performance of the existing reinforced concrete beams increased by 3 times, the ductility by 2.5 times, and the energy dissipation capacity by 7 times.
Highlights
Structural members need to be strengthened through retrofitting due to revision in the current design code or change in load
This study proposes a new type of retrofitting details using modularized steel plates
The purpose of this study is to propose and examine a modularized steel plate The purpose of this study is to propose and examine a modularized steel plate retroretrofitting method resulting in improved structural performance and constructability
Summary
Structural members need to be strengthened through retrofitting due to revision in the current design code or change in load. The retrofitting methods using jacketing have mainly been investigated by many scholars to improve the strength and ductility of existing structural members. Steel jacketing or fiber-reinforced polymer (FRP) jacketing is a commonly employed method used to retrofit concrete beams and columns. Garzon-Roca et al [1] experimentally investigated the behavior of beam-column joint strengthened with steel caging under combined bending and axial load. Wei and Wu [3] tested concrete columns retrofitted with high strength steel wire and proposed stress-strain relationship. The size of steel angles, strip spacing, and grout material were considered as parameters. They reported that most of the specimens were failed due to buckling of the steel angle by crushing of the columns. It has been proven that the proposed systems can improve strength and ductility than conventional method
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