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Experimental study on seismic performance of full-scale concrete-filled steel tube columns with openings in the steel tube wall

MA Hua;LI Meina;WANG Qianqian;WANG Wenjing;LI Zhenbao;CHEN Haiyan;Beijing University of Technology, Key Laboratory of Urban Security and Disaster Engineering of Education Ministry;China Construction Technology Group Co., Ltd.;Wanda Business Planning Institute Co., Ltd.;  
For the connection form of rebar perforation between reinforced concrete beam and concrete-filled steel tube(CFST), the effects of the seismic performances of CFST columns with and without holes by rebar penetration on the tube wall and reinforcement for the holes were studied. Low-cyclic repeated loading tests were carried out on three full-scale CFST columns with diameter of 610 mm. Among the specimens, one is designed without opening holes, another is with opening holes and the last one is with opening holes and reinforcements. The results show that local buckling failure is occurred for the specimen without opening holes at the location of 100 mm from the root of column. The failure of the specimen with holes is the buckling and tear at the edge of holes. Small holes by rebar penetration have little influence on the initial stiffness and peak load capacity of the CFST column. However, after the peak load, due to the tearing damage at the edge of holes, the stiffness and strength of the specimen deteriorate rapidly, and both the ductility and energy dissipation capacity of the specimen decrease. The failure position of the CFST column with reinforcement is located at 90 mm above the reinforcement section, and this specimen shows similar seismic performance with the CFST column without holes.
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