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Steel and Composite Structures Volume 46, Number 3, February10 2023 , pages 417-433 DOI: https://doi.org/10.12989/scs.2023.46.3.417 |
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Ductile capacity study of buckling-restrained braced steel frame with rotational connections |
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Mingming Jia, Jinzhou He and Dagang Lu
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| Abstract | ||
| The maximum ductility and cumulative ductility of connection joints of Buckling-Restrained Braced Frames (BRBF) are critical to the structural overall performance, which should be matched with the BRB ductility. The two-story and one-span BRBF with a one-third scale was tested under cyclic quasi-static loading, and the top-flange beam splice (TFBS) rotational connections were proposed and adopted in BRBF. The deformation capacity of TFBS connections was observed during the test, and the relationship between structural global ductility and local connection ductility was studied. The rotational capacity of the beam-column connections and the stability performance of the BRBs are highly relevant to the structural overall performance. The hysteretic curves of BRBF are stable and full under large displacement demand imposed up to 2% story drift, and energy is dissipated as the large plastic deformation developed in the structural components. The BRBs acted as fuses and yielded first, and the cumulative plastic ductility (CPD) of BRBs is 972.6 of the second floor and 439.7 of the first floor, indicating the excellent energy dissipation capacity of BRBs. Structural members with good local ductility ensure the large global ductility of BRBF. The ductile capacity and hysteretic behavior of BRBF with TFBS connections were compared with those of BRBF with Reduced Beam Section (RBS) connections in terms of the experimental results. | ||
| Key Words | ||
| buckling-restrained brace; ductility; energy dissipation capacity; hysteretic performance; top-flange beam splice connection | ||
| Address | ||
| Mingming Jia and Dagang Lu:1)School of Civil Engineering, Harbin Institute of Technology, 73 Huanghe Road, Nangang District, Harbin 150090, China 2)Key Lab of Structural Dynamic Behavior and Control of the Ministry of Education, 73 Huanghe Road, Nangang District, Harbin Institute of Technology, Harbin 150090, China 3)Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology, Harbin Institute of Technology, 73 Huanghe Road, Nangang District, Harbin 150090, China Jinzhou He:School of Civil Engineering, Harbin Institute of Technology, 73 Huanghe Road, Nangang District, Harbin 150090, China | ||