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Experimental study on cantilever beam-column connections of self-centering reinforced concrete frame with friction devices

LIU Zhefeng;GUO Jia;LI Peng;XIE Zhuoxiang;LI Huageng;School of Civil Engineering and Architecture,Changsha University of Science & Technology;Key Laboratory of Bridge Engineering Safety Control of China Ministry of Education,Changsha University of Science & Technology;  
A cantilever beam-column connection of self-centering reinforced concrete frame with friction devices is proposed in this paper.The self-centering and energy dissipation mechanism is investigated through eight low cyclic tests.The influences of initial tendon forces and initial bolt forces on the performance of the connections are analyzed.Test results show that the connection has a good self-centering and energy dissipation capacity.As the beam rotates against the cantilever beam which fixed on the column,the mechanism of column becomes clearer.The steel jacket at the beam ends avoids local crushing of the concrete.The rotational stiffness is increased with tendon tensile stiffness.The energy dissipation capacity is increased with the normal forces of the friction bolts and cantilever length.As the initial tendon forces increase,larger self-centering capacity is obtained.To ensure the hysteresis capability of connection,the anchorage of the longitudinal reinforcement of cantilever beam in the column needs to be enhanced.
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