Mechanical Property Analysis of Spherical Joints of Concrete-Filled Steel Tubular Wind Power Towers

WEN Yang; LI Zhaojian; YU Jiao

doi:10.3969/j.issn.0258-2724.20210583

Volume 58 Issue 6

Dec. 2023

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Journal of Southwest Jiaotong University > 2023 > 58(6): 1440-1448.

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WEN Yang, LI Zhaojian, YU Jiao. Mechanical Property Analysis of Spherical Joints of Concrete-Filled Steel Tubular Wind Power Towers[J]. Journal of Southwest Jiaotong University, 2023, 58(6): 1440-1448. doi: 10.3969/j.issn.0258-2724.20210583

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Mechanical Property Analysis of Spherical Joints of Concrete-Filled Steel Tubular Wind Power Towers

doi: 10.3969/j.issn.0258-2724.20210583

School of Civil Engineering, Inner Mongolia University of Science and Technology, Baotou 014010, China

Received Date: 18 Jul 2021
Rev Recd Date: 15 Mar 2022

Available Online: 29 Jun 2023

Publish Date: 21 Apr 2022

Abstract

Abstract

In order to find a more suitable joint form for the concrete-filled steel tubular (CFST) lattice wind power tower, static tests of models for two flanged spherical branch joints and two flanged bolted spherical joints were carried out, and the finite element analysis was performed. By taking the height and thickness of the table as the changing parameters, the failure modes of the two kinds of joints, the equivalent stress distribution of the flange, and the axial force-deformation curve of the web rod were compared. The research results show that the failure modes of flanged spherical branch joints are shear failure of high-strength bolts, and those of flanged bolted spherical joints are table weld tear failure and buckling-tear failure. Compared with that of the flanged spherical branch joint, the equivalent stress distribution of the flange and the table of the flanged bolted spherical joint is uniform, and the material utilization rate is higher; the absolute values of the maximum stress are increased by 19% and 52%, respectively, and the bearing capacity is strong. The plastic stage of the axial force-deformation curve of the web rod is long, and the ductility is excellent. The change in the height or thickness of the table is more sensitive to the ultimate bearing capacity of the joint, and a higher ultimate bearing capacity is observed. The flanged bolted spherical joint can be promoted and widely applied.
- concrete-filled steel tubular,
- wind power tower,
- spherical joint,
- mechanical property comparison,
- finite element analysis

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