Abstract
In this study, constituent elements affecting the shear strength of RCS joints were investigated through experiment and analysis study. A series of five interior RCS beam-column joint specimens, which were classified as JH-type and CP-type, was tested to investigate the contribution of each shear resisting element such as JH (Joint Hoop), CP (Cover Plate), FBP (Face Bearing Plate), E-FBP (Extended Face Bearing Plate), TB (Transverse Beam), and BP (Band Plate). Comparison between experiment and analysis results showed that the stiffness and strength of the RCS joint were reasonably assessed from the analysis. As a result of the analysis, it was found that TB, E-FBP, and CP increased the shear strength by about 15%, 14%, and 26%, respectively. For the JH-type specimen, 70% of the shear strength of the RCS joint is supported by the inner element and 30% of the shear strength is supported by the outer element. Shear strength contribution ratio of the outer element of CP-type specimen is larger than that of the JH-type specimen. For all specimens except for SNI-1, around 10% of total shear strength is supported by FBP. The shear strength equation of the RCS joint proposed by ASCE underestimates the contribution of the outer element, while that of M-Kanno tends to overestimate it.
Highlights
Reinforced concrete and steel (RCS) moment frame system is one of the composite structural systems that consists of reinforced concrete (RC) columns and steel beams. is system has been gaining its popularity recently because costeffective structures could be constructed by using RC columns instead of steel columns especially for long-span frames [1]
Kanno [12, 13] carried out experiment on RCS joint and suggested a shear strength equation that considers the effect of Transverse Beam (TB) and Band Plate (BP) based on the ASCE equation
Many experimental and analytical studies have been executed to find structural behavior and shear transfer mechanism of RCS joint and shear force equations of RCS joint have been proposed, their applications are limited to certain RCS joint details, since the effect of some elements consisting RCS joint is still unclear. e equations of ASCE and Kanno have a problem estimating accurate shear strength contribution of Transverse Beam (TB), Extended Face Bearing Plate (E-FBP), and Cover Plate (CP). is research focuses on evaluating the accurate shear resistance contribution of each element through experiment and analysis so that the RCS design procedure that is applicable to any joint detail could be developed
Summary
Reinforced concrete and steel (RCS) moment frame system is one of the composite structural systems that consists of reinforced concrete (RC) columns and steel beams. is system has been gaining its popularity recently because costeffective structures could be constructed by using RC columns instead of steel columns especially for long-span frames [1]. The usage of RC columns in this system increases structural damping and lateral stiffness of the buildings compared to those of steel moment frame systems This system is typically adopted for the construction of highrise buildings located in low to moderate seismic region, with appropriate joint details, this system is proven to be adequate for buildings in the high seismic region [2, 3]. Many experimental and analytical studies have been executed to find structural behavior and shear transfer mechanism of RCS joint and shear force equations of RCS joint have been proposed, their applications are limited to certain RCS joint details, since the effect of some elements consisting RCS joint is still unclear. Is research focuses on evaluating the accurate shear resistance contribution of each element through experiment and analysis so that the RCS design procedure that is applicable to any joint detail could be developed. To fulfill the purpose of the study, five RCS joint specimens were tested, and an analytical study was performed by using ANSYS software based on the test results
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