Steel and Composite Structures

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Mechanical properties of new stainless steel-aluminum alloy composite joint in tower structures

  • Yingying Zhang (Jiangsu Key Laboratory of Environmental Impact and Structural Safety in Engineering, State Key Laboratory for Geomechanics and Deep Underground Engineering, Jiangsu Collaborative Innovation Center for Building Energy Saving and Construction Technology, China University of Mining and Technology) ;
  • Qiu Yu (Jiangsu Key Laboratory of Environmental Impact and Structural Safety in Engineering, State Key Laboratory for Geomechanics and Deep Underground Engineering, Jiangsu Collaborative Innovation Center for Building Energy Saving and Construction Technology, China University of Mining and Technology) ;
  • Wei Song (Jiangsu Key Laboratory of Environmental Impact and Structural Safety in Engineering, State Key Laboratory for Geomechanics and Deep Underground Engineering, Jiangsu Collaborative Innovation Center for Building Energy Saving and Construction Technology, China University of Mining and Technology) ;
  • Junhao Xu (Jiangsu Key Laboratory of Environmental Impact and Structural Safety in Engineering, State Key Laboratory for Geomechanics and Deep Underground Engineering, Jiangsu Collaborative Innovation Center for Building Energy Saving and Construction Technology, China University of Mining and Technology) ;
  • Yushuai Zhao (Jiangsu Key Laboratory of Environmental Impact and Structural Safety in Engineering, State Key Laboratory for Geomechanics and Deep Underground Engineering, Jiangsu Collaborative Innovation Center for Building Energy Saving and Construction Technology, China University of Mining and Technology) ;
  • Baorui Sun (Jiangsu Key Laboratory of Environmental Impact and Structural Safety in Engineering, State Key Laboratory for Geomechanics and Deep Underground Engineering, Jiangsu Collaborative Innovation Center for Building Energy Saving and Construction Technology, China University of Mining and Technology)
  • Received : 2021.05.16
  • Accepted : 2023.06.13
  • Published : 2023.12.10
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Abstract

Tower structures have been widely used in communication and transmission engineering. The failure of joints is the leading cause of structure failure, which make it play a crucial role in tower structure engineering. In this study, the aluminum alloy three tube tower structure is taken as the prototype, and the middle joint of the tower was selected as the research object. Three different stainless steel-aluminum alloy composite joints (SACJs), denoted by TA, TB and TC, were designed. Finite element (FE) modeling analysis was used to compare and determine the TC joint as the best solution. Detail requirements of fasteners in the TC stainless steel-aluminum alloy composite joint (TC-SACJ) were designed and verified. In order to systematically and comprehensively study the mechanical properties of TC-SACJ under multi-directional loading conditions, the full-scale experiments and FE simulation models were all performed for mechanical response analysis. The failure modes, load-carrying capacities, and axial load versus displacement/stain testing curves of all full-scale specimens under tension/compression loading conditions were obtained. The results show that the maximum vertical displacement of aluminum alloy tube is 26.9mm, and the maximum lateral displacement of TC-SACJs is 1.0 mm. In general, the TC-SACJs are in an elastic state under the design load, which meet the design requirements and has a good safety reserve. This work can provide references for the design and engineering application of aluminum alloy tower structures.

Keywords

Acknowledgement

The authors are grateful for the financial support from the National Key Research and Development Project of China (No. 2017YFC1500702), the National Natural Science Foundation of China (No. 52278229), Jiangsu Collaborative Innovation Center of building energy-saving and construction technology (No. SJXTBS2122), and the Postgraduate Research & Practice Innovation Program of Jiangsu Province (No. KYCX21_2275).

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