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Steel and Composite Structures Volume 39, Number 4, May25 2021 , pages 383-399 DOI: https://doi.org/10.12989/scs.2021.39.4.383 |
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Anti-collapse performance analysis of unequal span steel–concrete composite substructures |
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Bao Meng, Liangde Li, Weihui Zhong, Zheng Tan and Yuhui Zheng
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| Abstract | ||
| In the study, three 1:3-scale unequal span steel–concrete composite substructures with top-seat angle and double web angle connection were designed and identified as specimens GTSDWA-0.6, GTSDWA-1.0, and GTSDWA-1.4. Pseudo-static tests and refined numerical model analysis were conducted to examine the anti-progressive collapse performance of a semi-rigid steel–concrete composite substructure. The results indicated that the failure modes of the three specimens revealed that the fracture occurred in the root of the long leg of the top/seat angle in tension at the connection. With increases in the span ratio of the left and right composite beams, the bearing capacities of the composite substructures decreased, and the corresponding displacement increased. With respect to GTSDWA-0.6 and GTSDWA-1.4, the resistance due to the short composite beam corresponded to 62% and 60%, respectively, and the total resistance provided by the short composite beam exceeded that of the long composite beam. With respect to GTSDWA-1.0, the resistance due to the left and right composite beams was similar. All three specimens underwent the flexure mechanism and flexure–axial mixed mechanism stages. They resisted the external load mainly via the flexure mechanism. Moreover, the addition of stiffeners on both sides of the top and seat angles is advantageous in terms of improving the collapse resistance and ductility of unequal span composite substructures. | ||
| Key Words | ||
| steel–concrete composite substructure; semi-rigid connection; progressive collapse; performance analysis; unequal span | ||
| Address | ||
| Bao Meng: School of Civil Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China; Key Lab of Structural Engineering and Earthquake Resistance, Ministry of Education (XAUAT), Xi'an 710055, China Liangde Li, Weihui Zhong, Zheng Tan and Yuhui Zheng: School of Civil Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China | ||