Abstract
This paper presents an experimental investigation of the seismic performance of interior beam–column joints with beams reinforced with Grade 600MPa longitudinal steel bars. Six full-scale reinforcement concrete (RC) interior joints are designed with different axial compression ratios and longitudinal reinforcement ratios, which are tested under reversed cyclic loading. Failure modes, hysteretic curves, skeleton curves, energy dissipation capacity, and the ductility of joints are investigated systematically. Moreover, the effect of the different axial compression ratios and longitudinal reinforcement ratios on the seismic behavior of the joints are deeply studied. Comparisons performed between specimens demonstrate that among the beam–column joints with 600 MPa high strength steel bars, specimens with high reinforcement ratios have better energy dissipation capacity, slower stiffness degradation, and lower ductility. Moreover, with the increase of the axial compression ratios, the energy dissipation capacity and ductility become weaker. The test results show the favorable seismic properties of beam–column joints equipped with 600 MPa high strength steel bars, which can be regarded as the research basis of the popularization and application of 600 MPa high strength steel bars in reinforcement concrete frame structures.
Highlights
Reinforcement concrete frame systems are widely used in concrete structures for earthquake-resistant design because of their structural efficiency and architectural flexibility [1,2,3,4].large beam and column sections often make it difficult for architectural designs to meet the structural requirements
Further experimental research is required to evaluate the seismic performance of longitudinal high strength steel bars used in different frame elements, including interior beam–column joints
Five exterior beam–column joints reinforced with Grades 500 MPa and 700 MPa steel bars were tested to study the seismic behavior of Alaee et al [27]
Summary
Reinforcement concrete frame systems are widely used in concrete structures for earthquake-resistant design because of their structural efficiency and architectural flexibility [1,2,3,4]. Further experimental research is required to evaluate the seismic performance of longitudinal high strength steel bars used in different frame elements, including interior beam–column joints. Five exterior beam–column joints reinforced with Grades 500 MPa and 700 MPa steel bars were tested to study the seismic behavior of Alaee et al [27]. Further research is required for the use of longitudinal steel bars with a yield strength of greater than 500 MPa to expand the current limit of allowable strength of steel bars in reinforcement concrete frame structures. The interior beam–column joints with beam reinforced with Grade 600 MPa longitudinal steel bars were designed, fabricated and tested. The load transfer mechanism, failure mode, ductility, energy dissipation capacity, and strength of beam–column joints are investigated under cyclic loading for different seismic requirements. The results of this study are expected to provide evidence that the comprehensive seismic behaviors of the beam–column joints equipped with 600 MPa high strength steel bars can satisfy the seismic requirements
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