Axial buckling of imperfect cylindrical steel silos with isotropic walls under stored solids loads: FE analyses versus Eurocode provisions

Mehretehran, Alireza Moazezi; Maleki, Shervin

doi:10.1016/j.engfailanal.2022.106282

Cited by 11 publications

(3 citation statements)

References 34 publications

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“…This portion is highly dependent on the wall's rigidity. The vertical load sustained by the wall decreases as the rigidity decreases and vice versa [4,24]. As a result, it is important to compare the proposed wall width-to-thickness ratio with the Eurocode requirement.…”

Section: Vertical Load Distributionmentioning

confidence: 99%

RETRACTED ARTICLE: Current design of rectangular steel silos: limitations and improvement

Abdelbarr,

Ramadan,

Hilal

et al. 2024

J. Eng. Appl. Sci.

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This study proposes a modification for the current design approach for square and rectangular silos that accounts for silos’ wall flexibility. First, the authors investigated the effect of wall stiffness symbolized by the wall width-to-thickness ratio (a/t) and silo’s dimensions, on the wall-filling pressure using a recently validated 3D finite element model (FEM). The model was then employed to predict the pressures acting on silos’ walls accounting for the stress state in stored granular materials. Most design formulas and guidelines assume silos’ walls to be rigid. This assumption is acceptable for the case of rigid wall concrete silos; however, it is questionable for semi-rigid, flexible wall metal silos. Consequentially, it is crucial to determine the minimum wall stiffness necessary to secure the applicability of the current design rigid wall assumptions and to propose a way to deal with semi-rigid and flexible walls. To this end, several wall pressure distributions that correspond to filling steel silos with varied wall thicknesses were studied. A new adjustment to the Janssen technique was proposed for a better estimate of the wall-filling pressures for square and rectangular silos. In the case of prismatic silos, the Eurocode uses the Janssen equation together with an equivalent radius of a corresponding circular silo (with the same hydraulic radius) to determine the wall pressure. This method predicts pressure values that are practically accurate for rigid-wall silos, but its accuracy decreases for semi-rigid and flexible-wall silos. As an enhancement, the Janssen equation was modified in this research to generate more accurate pressure estimates based on the equivalent volume concept. The finite element results of several developed models with the same granular material were compared to the estimations of the newly established approach to verify the broad range of its applicability.

show abstract

Section: Vertical Load Distributionmentioning

confidence: 99%

RETRACTED ARTICLE: Current design of rectangular steel silos: limitations and improvement

Abdelbarr,

Ramadan,

Hilal

et al. 2024

J. Eng. Appl. Sci.

View full text Add to dashboard Cite

show abstract

“…This portion is highly depending on the the walls rigidity. The vertical load sustained by the wall decreases as the rigidity decreases, and vice versa [4,26]. As a result, it is important to compare the proposed wall width-to-thickness ratio with the Eurocode requirement.…”

Section: Vertical Load Distributionmentioning

confidence: 99%

Current Design of Rectangular Steel Silos: Limitations and Improvement

Hilal

Sanad

Abdelbarr

et al. 2023

Preprint

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This study proposes a modification for the current design approach for rectangular silos that accounts of silos’ wall flexibility. First, the authors investigated the effect of wall stiffness, symbolized by the wall width-to-thickness ratio (a/t), on the wall-filling pressure using a recently validated 3D finite element model (F.E.M.). The model was then employed to predict the pressures acting on flexible-wall silos accounting for the stress state in stored granular materials. Most design formulas and guidelines assume silos’ walls to be rigid. This assumption is acceptable for the case of thick-wall concrete silos; it is questionable for thin-wall, metal silos, however. Consequentially, it is crucial to determine the minimum wall stiffness necessary to secure the applicability of the current design rigid wall assumption, and to propose a way to deal with more flexible walls. To this end, several wall pressure distributions that correspond to filling steel silos with varied wall thicknesses were studied. A new adjustment to the Janssen technique was proposed for a better estimate of the wall-filling pressures for square or rectangular silos. In the case of square silos, the Eurocode uses the Janssen equation together with an equivalent radius of a corresponding circular silo (with the same hydraulic radius) to determine the wall pressure. This method predicts pressure values that are practically accurate for rigid-wall silos, but its accuracy decreases for flexible-wall silos. As a remedy, the Janssen equation was modified in this research to generate more accurate pressure estimates based on the equivalent volume concept. The finite element results of several developed models with the same granular material were compared to the estimations of the newly established approach to verify the broad range of its applicability.

show abstract

“…Based on structural mechanics, cylindrical pressure shells are widely used due to the convenience of processing and fabricating, high utilization rate of inside space, and the ability to be combined with hemispherical, ellipsoidal, and conical heads [26][27][28][29]. Nevertheless, cylindrical pressure shells have limited compressive strength.…”

Section: Introductionmentioning

confidence: 99%

Failure Behavior of Corrugated Pressure Cylindrical Shells with Variable Wall Thickness under Uniform External Pressure

Sun,

Zhang,

Zhang

et al. 2024

JMSE

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The main load-bearing structure of submarines is the pressure shell. Shell failures are usually caused by high hydrostatic pressure and its own potential geometric imperfections. This paper proposes a cylindrical shell with a strong corrugated stiffening structure. Two theoretically geometrically identical shells are fabricated using CNC machining to ensure the reproducibility and reasonableness of the results. Firstly, the point cloud data of all the geometric parameters of the corrugated pressure cylindrical shells were obtained using a 3D scanner. Geomagic Control X 3D inspection software was used to determine the geometric deviations of the shells. Geometric reconstruction was performed using Geomagic Design X reverse modeling software to capture potential imperfections of the shells. The aluminum shells were then welded and placed in the pressure chamber. Failure loads were obtained for all shells by constant water injection and pressurization. Considering the confined nature of the pressure chamber, a nonlinear finite element analysis of the corrugated pressure cylindrical shell was carried out using Abaqus/Riks, taking into account actual fabrication imperfections. Finally, the failure behavior of the shells under uniform external pressure was determined. The results show that both corrugated pressure cylindrical shells have high machining accuracy. The numerical simulation results of the critical buckling load of the corrugated pressure cylindrical shells were in good agreement with the test results. The corrugated structure has additional advantages in retarding the generation and expansion of shell surface defects. The equilibrium path of the corrugated pressure cylindrical shell can be maintained in a smooth and continuous state, showing stable buckling behavior. This study will provide new inspiration for the structural design and failure prediction of the submarine pressure shell.

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Axial buckling of imperfect cylindrical steel silos with isotropic walls under stored solids loads: FE analyses versus Eurocode provisions

Cited by 11 publications

References 34 publications

RETRACTED ARTICLE: Current design of rectangular steel silos: limitations and improvement

RETRACTED ARTICLE: Current design of rectangular steel silos: limitations and improvement

Current Design of Rectangular Steel Silos: Limitations and Improvement

Failure Behavior of Corrugated Pressure Cylindrical Shells with Variable Wall Thickness under Uniform External Pressure

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