Abstract
To improve the load carrying capacity and narrow the cracks of the reinforced concrete (RC) ring beam connection, a novel steel-reinforced engineered cementitious composite (RECC) ring beam connection is proposed, for which the column steel tube is disconnected and an enlarged RECC ring beam is used at the connection. In this paper, the failure mechanisms of the ECC-encased CFST composite column-RECC ring beam connection under axial and eccentric loading were numerically analyzed. According to the results of finite element (FE) analysis, additional longitudinal reinforcement and reinforcement of the composite column made great contributions to vertical force transmission. The compressive strength of the joint core region was enhanced by the constraint effect from the ring reinforcement, ECC ring beam and additional stirrups. Finally, based on the FE analysis, the calculation model of flexural-carrying capacity for the connection system was deduced.
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