Experimental Study on Bearing Capacity of Polyvinyl Chloride Carbon Fiber-Reinforced Polymer-Confined Reinforced Concrete Column with Ring Beam Joint under Axial Load

摘要

This paper presents an experimental study on bearing capacity of polyvinyl chloride (PVC) carbon fiber-reinforced polymer (CFRP) confined reinforced concrete columns with ring beam joint (PCRBJs) under axial load. All PCRBJs conform to the principle of "strong-column/weak-joint". Four parameters including stirrup ratio, reinforcement ratio, height, and width of the ring beam are considered. Test results demonstrate that the ultimate bearing capacity of PCRBJs increases with stirrup ratio, reinforcement ratio, or ring beam width increases, while it decreases as ring beam height increases. On the basis of the local compression theory, as well as in accordance with confined concrete theory, the concept of gradual superposition of the confinement of multiple annular steel bars on core concrete is adopted, an effect coefficient of joint height is introduced, and a model for predicting the ultimate bearing capacity of PCRBJs is proposed. The predicted results agree well with test data.