Steel and Composite Structures

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A novel design method for improving collapse resistances of multi-story steel frames with unequal spans using steel braces

  • 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) ;
  • Shi-chao Duan (School of Civil Engineering, Xi'an University of Architecture and Technology) ;
  • Hong-chen Wang (China Northwest Architecture Design and Research Institute Co., Ltd) ;
  • Xing-You Yao (Jiangxi Province Key Laboratory of Hydraulic and Civil Engineering Infrastructure Security, Nanchang Institute of Technology) ;
  • Yu-hui Zheng (School of Civil Engineering, Xi'an University of Architecture and Technology)
  • Received : 2022.10.19
  • Accepted : 2023.02.13
  • Published : 2023.04.25
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Abstract

The bearing capacities resisted by the two-bay beams of multi-story planar frames with unequal spans under column removal scenarios differ considerably owing to the asymmetric stress on the left and right beams connected to the failed column and cause the potential for beams with larger span-to-depth ratios to be unable to exert effectively, which is disadvantageous for resisting the vertical load in unequal-span frame structures. To address this problem, the structural measure of adding braces to the weak bays of multi-story unequal-span frames was proposed, with the objective of achieving a coordinated stress state in two-bay beams with unequal spans, thereby improving the collapse resistance of unequal-span frame structures. Before conducting the numerical simulation, the modeling methods were verified by previous experimental results of two multi-story planar frames with and without steel braces. Thereafter, the effects of the tensile and compressive braces on the collapse behavior of the frame structures were elucidated. Then, based on the mechanical action laws of the braces throughout the collapse process, a detailed design method for improving the collapse resistance of unequal-span frame structures was proposed. Finally, the proposed design method was verified by using sufficient example models, and the results demonstrated that the design method has good application prospects and high practical value.

Keywords

Acknowledgement

The research was supported by the National Natural Science Foundation of China (Nos. 52178162 and 51908449). The authors also gratefully acknowledge the financial support provided by the scientific research plan projects of Shaanxi Education Department (Nos. 20JY033 and 20JK0713), Key Research and Development Project of Shaanxi Province (No. 2022SF-121), and Natural Science Basic Research Program of Shaanxi Province (No. 2022JQ-381)

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