Abstract
High-strength reinforcing bars have high yield strengths. It is possible to reduce the number of reinforcing bars placed in a building. Accordingly, as the amount of reinforcement decreases, the spacing of reinforcing bars increases, workability improves, and the construction period shortens. To evaluate the structural performance of high-strength reinforcing bars and the joint performance of high-strength threaded reinforcing bars, flexural performance tests were performed in this study on 12 beam members with the compressive strength of concrete, the yield strength of the tensile reinforcing bars, and the tensile reinforcing bar ratio as variables. The yield strengths of the tensile reinforcement and joint methods were used as variables, and joint performance tests were performed for six beam members. Based on this study, the foundation for using high-strength reinforcing bars with a design standard yield strength equal to 600 MPa was established. Accordingly, mechanical joints of high-strength threaded reinforcing bars (600 and 670 MPa) can be used. All six specimens were destroyed under more than the expected nominal strength. Lap splice caused brittle fractures because it was not reinforced in stirrup. Increases of 21% to 47% in the loads of specimens using a coupler and a lock nut were observed. Shape yield represents destruction—a section must ensure sufficient ductility after yielding. Therefore, a coupler and lock nut are effective.
Highlights
Many skyscrapers are currently being planned for construction as countermeasures to resolve overpopulation issues, increase public notice, minimize environmental impact by increasing green areas, maximize land use efficiency, and improve the image of a city in which skyscrapers will be constructed
The findings demonstrate that carbon fiber-reinforced polymer (CFRP) jackets and external steel ties are considerably useful in comparison to the used retrofitting strategy, concerning ductility and energy dissipation capacity
High-strength reinforcing bars have the characteristic that the higher the design standard yield strength, the stronger the have the characteristic that the higher the design standard yield strength, the stronger the nonlinearity of the stress–strain relationship, and the shorter the yield floor is
Summary
Many skyscrapers are currently being planned for construction as countermeasures to resolve overpopulation issues, increase public notice, minimize environmental impact by increasing green areas, maximize land use efficiency, and improve the image of a city in which skyscrapers will be constructed. The construction of high-rise structures has been increasing. When high-strength reinforcing bars are used in the construction of high-rise structures, it is possible to reduce the amount of reinforcement compared to general strength reinforcement. It is possible to provide a margin for the reinforcement spacing between members, improving workability and shortening the construction period. Eurocode II permits design standard yield strengths of up to 600 MPa for the main reinforcing bars, while Japan and the United States are gradually allowing the use of high-strength reinforcing bars [1,2,3].
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