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Steel and Composite Structures Volume 41, Number 5, December10 2021 , pages 663-679 DOI: https://doi.org/10.12989/scs.2021.41.5.663 |
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Collapse-resistant performance of a single-story frame assembly and multi-story sub-frame under an internal column-removal scenario |
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Wei-hui Zhong, Zheng Tan, Li-min Tian, Bao Meng, Yu-hui Zhengand Shi-chao Daun
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| Abstract | ||
| To elucidate the differences in the collapse behavior between a single-story beam-column assembly and multi-story frame, two 1/3-scale two-bay composite frames, including a single-story composite beam–column assembly and a three-story composite sub-frame, were designed and quasi-statically tested. The load–displacement responses, failure modes, and internal force development of the two frames were analyzed and compared in detail. Furthermore, the resistance mechanisms of the two specimens were explored, and the respective contributions of different load-resisting mechanisms to the total resistances were quantitatively separated to gain deeper insights. The experimental tests indicated that Vierendeel action was present in the two-dimensional multi-story frames, which led to an uneven internal force distribution among the three stories. The collapse resistance of TSDWA-3S in the flexural stage was not significantly increased by the structural redundancy provided by the additional story, as compared to that of TSDWA-1S. Although the development of the load response was similar in the two specimens at flexural stage, the collapse mechanisms of the multi-story composite frame were much more complicated than those of the single-story beam–column assembly, and the combined action between stories was critical in determining the internal force redistribution and rebalancing of the remaining structure. | ||
| Key Words | ||
| multi-story composite sub-frame; progressive collapse; single-story composite beam–column assembly; static test; performance analysis | ||
| Address | ||
| Wei-hui Zhong: School of Civil Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China; Key Laboratory of Structural Engineering and Earthquake Resistance, Ministry of Education, Xi'an University of Architecture and Technology, Xi'an 710055, China Zheng Tan, Li-min Tian, Bao Meng, Yu-hui Zheng and Shi-chao Daun:School of Civil Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China | ||