Study of the Importance of Moment Ratio and Anchorage Length in Preventing Joint Shear Failure in Exterior Beam-Column Joints
摘要
Designing exterior beam-column joints to withstand forces and moments during seismic events is crucial for ensuring the overall stability and safety of a moment-resisting frame structure. This paper presents an evaluation of series of a database of exterior beam-column joints from previous research conducted over the last three decades. Nineteen experimental data sets of exterior beam-column joints were processed using consistent criteria to determine the most influential parameters affecting the performance of exterior RC beam-column joints under seismic loading. All specimens were constructed without out-of-plan members (slabs and transversal beams) and had variations on concrete compressive strength, rebar grades, column reinforcement ratio, beam reinforcement ratio, column axial load, moment ratio, joint hoops ratio, joint strength ratio, adequacy of anchorage length, and failure mode. The evaluation focused on the four most influential parameters: joint strength ratio, moment ratio, joint hoops ratio, and anchorage length. The results indicate that the moment ratio and anchorage length are the most influential parameters in affecting joint shear failure of exterior beam-column joints compared to the joint strength ratio. Furthermore, the joint hoops ratio showed no significant correlation, suggesting potential further research on the ACI 318 strict requirement of joint hoops.