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Buckling Behavior of Spiral Steel Folded Silos

Pourzeynali, Parham | 2025

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 58508 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Moazezi Mehretehran, Alireza
  7. Abstract:
  8. Cylindrical steel silos are widely used in industry for the storage of granular materials. These structures are generally classified into three main construction types: flat sheet silos, corrugated sheet silos and spiral steel (Lipp) silos. Most previous studies focus on flat and corrugated sheet silos and there is a lack of information about the buckling behavior of Lipp silos. This study investigates the axial buckling behavior of two full-scale spiral silo specimens, considering axial compressive forces using 3D finite element modeling in Abaqus. The geometrical properties of the silos are as follows: Silo-I has a height of 20 m, a diameter of 15 m, and a wall thickness of 0.015 m, while Silo-II has a height of 27 m, a diameter of 16 m, and a wall thickness of 0.016 m. Furthermore, axial buckling under frictional traction and internal normal pressure arising from ensiled material (wheat) has been also taken into account. The effect of the continuous circumferential spiral ring angle on buckling capacity and sensitivity to geometrical imperfections is additionally examined. Moreover, a detailed parametric study is conducted through linear and non-linear analyses to investigate the effect of utilizing continuous spiral rings against discrete circumferential ones, considering two scenarios: (A) changing the cross-sectional shape of the rings while maintaining their number and spacing, and (B) reducing the number of rings while increasing the cross-sectional size (maintaining the overall weight). The results demonstrated that the spiral silos exhibited higher axial buckling performance compared with their conventionally ring-stiffened counterparts. The improvement in buckling capacity ranged between approximately 10% and 25%, depending on the ring angle and the magnitude of the introduced geometric imperfections
  9. Keywords:
  10. Axial Buckling ; Finite Element Analysis ; Ring-Stiffened Silos ; Spiral Steel Silos ; Geometric Imperfection

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