Steel and Composite Structures

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On compressive behavior of large welded hollow spherical joints with both internal and external stiffeners

  • Tingting Shu (Department of Civil Engineering, Zhejiang University) ;
  • Xian Xu (Department of Civil Engineering, Zhejiang University) ;
  • Yaozhi Luo (Department of Civil Engineering, Zhejiang University)
  • Received : 2022.02.28
  • Accepted : 2022.12.21
  • Published : 2023.01.25
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Abstract

Welded hollow spherical joints are commonly used joints in space grid structures. An internal stiffener is generally adopted to strengthen the joints when large hollow spheres are used. To further strengthen it, external stiffeners can be used at the same time. In this study, axial compression tests are conducted on four full-scale 550 mm spherical joints. The failure modes and strengths of the tested joints are investigated. It shows that the external stiffeners are able to increase the strength of the joint up to 25%. A numerical model for large spherical joints with stiffeners is established and verified against the experimental results. Parametric studies are executed considering six main design factors using the verified model. It is found that the strength of the spherical joint increases as the thickness, height and number of the external stiffeners increase, and the hollow sphere's diameter has a neglectable effect on the enhancement caused by the external stiffeners. Based on the experimental and numerical results, a practical formula for the compressive bearing capacity of large welded hollow spherical joints with both internal and external stiffeners is proposed. The proposed formula gives a conservative prediction on the compressive capacity of large welded hollow spherical joints with both internal and external stiffeners.

Keywords

Acknowledgement

The research described in this paper was financially supported by the Natural Science Foundation of China (Grant No. 52178175) and a research grant from Center for Balance Architecture of Zhejiang University. The authors also thank Mr. Ru-Hao Wang, Si-Yuan Zhu, Tong-Hui Liang and Xiong-Jun Yang for their help in the implementation of the experiment.

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