NUMERICAL STUDY OF BEAM-COLUMN JOINT STRENGTHENING WITH A CONCRETE HAUNCH ON COLUMNS BELOW SNI 2847:2019 STANDARD USING 2D PLANE STRESS APPROACH

• Main Author: Zulqisthi Masulili, Taris
• Format: Theses
• Language: Indonesia
• Subjects: Teknik sipil
• Online Access: https://digilib.itb.ac.id/gdl/view/81596
• Institution: Institut Teknologi Bandung

Beam-column joints on low rise structure in Indonesia is often suboptimal, with column sizes less than 300x300 mm and lacking joint hoops. Therefore, this research is highly relevant for improving the safety and reliability of reinforced concrete structures in Indonesia. This study aims to evaluate the impact of inadequate column dimensions and the absence of joint hoops on the behavior of beam-column joints in reinforced concrete structures, as well as the effect of concrete haunch strengthening on the joints. The analysis was conducted using the finite element application VecTor2, which is based on 2D Plane Stress. Although VecTor2 is formulated for plane stress with low energy elements, careful consideration in determining boundary conditions was employed to ensure accurate results. The research began with the verification of the numerical model against previous laboratory tests. The verification of the beam-column joint model in this study was based on the results published by Meas et al. (2012) and Chaimahawan and Pimanmas (2009). The primary objective of this verification was to ensure that the numerical model used in the research could accurately reflect the actual behavior observed in the laboratory, thus validating and lending reliability to the analysis results. The study's findings indicate that, for both external and internal joints, the lack of adequate column dimensions and the absence of joint hoops did not significantly impact the failure modes. The failure behavior of beam-column joints was more influenced by the joint capacity, which in turn affected the performance of the beam-column joints in terms of shear capacity, ductility, and energy dissipation. For joints predicted to fail in a ductile manner, the addition of concrete haunch strengthening did not provide significant improvements and could even cause overstrength, disrupting the Strong Column Weak Beam (SCWB) design principle and failing to meet the acceptance criteria of ACI 374.1-05. Conversely, for joints predicted to exhibit brittle failure, concrete haunch reinforcement yielded positive results by enhancing strength degradation, stiffness, energy dissipation, and structural ductility. This research demonstrates that an appropriate design approach in using concrete haunch can enhance the performance of beam-column joints, particularly in scenarios where brittle failure is likely to occur.