Steel and Composite Structures

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Effect of unequal spans on the collapse behavior of multi-story frames with reduced beam section connections

  • Zheng Tan (School of Civil Engineering, Xi'an University of Architecture and Technology) ;
  • Wei-hui Zhong (School of Civil Engineering, Xi'an University of Architecture and Technology) ;
  • Bao Meng (School of Civil Engineering, Xi'an University of Architecture and Technology) ;
  • Li-min Tian (School of Civil Engineering, Xi'an University of Architecture and Technology) ;
  • Yao Gao (School of Civil Engineering, Xi'an University of Architecture and Technology) ;
  • Yu-hui Zheng (School of Civil Engineering, Xi'an University of Architecture and Technology) ;
  • Hong-Chen Wang (China Northwest Architecture Design and Research Institute Co., Ltd)
  • Received : 2021.12.06
  • Accepted : 2023.11.16
  • Published : 2024.01.10
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Abstract

Following an internal column failure, adjacent double-span beams above the failed column will play a critical role in the load transfer and internal force redistribution within the remaining structure, and the span-to-depth ratios of double-span beams significantly influence the structural resistance capacity against progressive collapse. Most existing studies have focused on the collapse-resistant performances of single-story symmetric structures, whereas limited published works are available on the collapse resistances of multi-story steel frames with unequal spans. To this end, in this study, numerical models based on shell elements were employed to investigate the structural behavior of multi-story steel frames with unequal spans. The simulation models were validated using the previous experimental results obtained for single- and two-story steel frames, and the load-displacement responses and internal force development of unequal-span three-story steel frames under three cases were comprehensively analyzed. In addition, the specific contributions of the different mechanism resistances of unequal-span, double-span beams of each story were separated quantitatively using the energy equilibrium theory, with an aim to gain a deeper level of understanding of the load-resistance mechanisms in the unequal-span steel frames. The results showed that the axial and flexural mechanism resistances were determined by the span ratio and linear stiffness ratio of double-span beams, respectively.

Keywords

Acknowledgement

The research was supported by the National Natural Science Foundation of China (Nos. 51678476, 51908449). The authors also gratefully acknowledge the financial support provided by the scientific research plan projects of Shaanxi Education Department (Nos. 20JY033, 20JK0713).

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