Structural Engineering and Mechanics

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Performance control analysis of concrete-filled steel tube sepa-rated spherical joint wind power tower

  • Yang Wen (School of Civil Engineering, Inner Mongolia University of Science and Technology) ;
  • Guangmao Xu (School of Civil Engineering, Inner Mongolia University of Science and Technology) ;
  • Xiazhi Wu (School of Civil Engineering, Inner Mongolia University of Science and Technology) ;
  • Zhaojian Li (School of Civil Engineering, Inner Mongolia University of Science and Technology)
  • Received : 2022.11.28
  • Accepted : 2023.06.02
  • Published : 2023.07.25
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Abstract

In this study, to explore the working performance of the CFST split spherical node wind power tower, two groups of CFST split spherical joint plane towers with different web wall thicknesses and a set of space systems were analyzed. The tower was subjected to a low-cycle repeated load test, and the hysteresis and skeleton curves were analyzed. ABAQUS finite element simulation was used for verification and comparison, and on this basis parameter expansion analysis was carried out. The results show that the failure mode of the wind power tower was divided into weld tear damage between belly bar, high strength bolt thread damage and belly rod flexion damage. In addition, increasing the wall thickness of the web member could render the hysteresis curve fuller. Finally, the bearing capacity of the separated spherical node wind power tower was high, but its plastic deformation ability was poor. The ultimate bearing capacity and ductility coefficient of the simulated specimens are positively correlated with web diameter ratio and web column stiffness ratio. When the diameter ratio of the web member was greater than 0.13, or the stiffness ratio γ of the web member to the column was greater than 0.022, the increase of the ultimate bearing capacity and ductility coefficient decreased significantly. In order to maximize the overall mechanical performance of the tower and improve its economy, it was suggested that the diameter ratio of the ventral rod be 0.11-0.13, while the stiffness ratio γ should be 0.02-0.022.

Keywords

Acknowledgement

The studies in this paper are financially supported by the National Natural science Foundation of china (grant no. 51768056), the Youth Science and Technology Talents Project of Inner Mongolia Autonomous Region (grant no. NJYT22068) and the Natural Science Foundation of Inner Mongolia Autonomous Region (grant no. 2019MS05038).

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