|
Title |
Shear Behavior and Shear Strength of Precast Exterior Beam?Column Joints Using SFRC with Reduced Transverse Reinforcement under Cyclic Loading
|
|
Authors |
김주경(Joo-Gyeong Kim) ; 이문석(Moon-Seok Lee) ; 최창식(Chank-Sik Choi) ; 배백일(Baek-Il Bae) |
|
DOI |
https://doi.org/10.11112/jksmi.2026.30.4.135 |
|
Keywords |
반복하중; 외부 보-기둥 접합부; 프리캐스트 콘크리트; 횡보강근; 강섬유; 전단거동; 전단강도 Cyclic loading; Exterior beam-column joint; Precast concrete; SFRC; Shear behavior; Shear strength; Transverse reinforcement |
|
Abstract |
This study evaluated the effects of steel fiber reinforcement on the shear behavior and shear strength of precast exterior beam?column joints with reduced transverse reinforcement under cyclic loading. Four specimens were tested, including one reinforced concrete (RC) specimen and three precast concrete (PC) specimens with different transverse reinforcement ratios and steel fiber contents. All specimens were subjected to displacement-controlled cyclic loading under constant axial load. The test results showed that the PC joints exhibited lower initial stiffness and peak strength, and larger joint shear deformation than the RC specimen due to interface discontinuities. In particular, the specimen with reduced transverse reinforcement showed early joint shear cracking, significant strength degradation, and pronounced pinching behavior. In contrast, the steel fiber-reinforced specimen showed improved post-cracking behavior by mitigating interface slip and delaying shear crack propagation. Comparison with existing design provisions indicated that conventional RC-based joint shear strength equations could not adequately reflect the interface behavior and steel fiber contribution in PC joints. Therefore, the shear strength evaluation of PC-SFRC joints should consider not only the conventional contributions of concrete and transverse reinforcement, but also the additional resistance mechanisms associated with interface shear resistance and steel fiber reinforcement.
|