| 수록사항 |
한국대공간건축 논문집 , Vol. 26, No. 3 (통권 105호)(2026-09) |
| 주제어 |
; Reinforced concrete; Exterior beam-column connection; Joint shear strength; Headed bar; Refinement strategy |
| 요약2 |
This study proposes a refined joint shear strength model for exterior reinforced concrete beam-column connections with headed bars. A database consisting of 44 exterior reinforced concrete beam-column connection specimens with headed bars and exhibiting joint shear failure was established. The experimentally measured joint shear strengths were compared with predictions obtained from an existing model. The average ratio of experimental strength to model prediction was 0.775, indicating that the existing model generally overestimated the joint shear strength of connections with headed bars. Parameters associated with the headed bar anchorage requirements of ACI 318-25 showed no distinct relationship with the observed prediction errors. In contrast, parameters related to joint confinement and the embedment ratio of headed bars exhibited noticeable trends. Based on these observations, a refined joint shear strength model was proposed by modifying the exponent of the beam reinforcement index and introducing adjustment factors associated with joint transverse reinforcement and headed bar embedment. Application of the proposed model reduced the average prediction error from 22.5% to 1.6% and the coefficient of variation from 0.190 to 0.120. |
