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A column connection achieved by integrated core sleeve and bolts and its design method were proposed, in order to solve the potential issues existed in traditional welded connections of box-shaped column such as lower construction efficiency, higher labor costs, poor seismic performance and environmental pollution, et al. A box-shaped column connection with integrated core sleeve and bolts (SBBC) and its design method were proposed. Three SBBCs with core sleeve, blind bolts and compensation plate, respectively, as well as a traditional fully-penetrated welded connection (FPWC) were designed. And low-cycle reciprocating loading tests were conducted to study the mechanical performance of the SBBC and the influences of core sleeve, blind bolt and compensation plate on the mechanical behavior of the SBBC. Comparative analyses between the SBBC and the FPWC were also conducted. The test results indicate that the installation of core sleeve could reduce the strain level of flanges by 30%-70% and the preload of high-strength bolts by 4%-21% as the inter-story drift is increased from 0.01 rad to 0.04 rad, demonstrating the core sleeve can effectively strengthen the flexural and shear capacity of the connection and the SSBC possesses favorable ductility and energy dissipation ability. It is basically consistent with each other before 0.05 rad and slightly different after 0.05 rad for the hysteretic curves of both SBBCs with blind bolts and compensation plates, which then can be adopted according to the practical needs. It can be concluded that the SBBC possess similar static performance to that of the FPWC and can be designed as a rigid connection as applied in actual engineering. © 2020, Editorial Office of Journal of Building Structures. All right reserved.
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