Buckling assessment of cylindrical steel silos under wind loading

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Moazezi Mehretehran Alireza; Maleki Shervin

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Journal: Modares Civil Engineering journal Year:2019 | Volume:19 | Issue:3 Page(s): 227-239

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Title

Buckling assessment of cylindrical steel silos under wind loading

Author(s)

Moazezi Mehretehran Alireza | Maleki Shervin | Issue Writer Certificate

Keywords

Steel cylindrical siloQ1

BucklingQ1

EurocodeQ1

Wind loadQ1

AbaqusQ1

Abstract

Thin-walled cylindrical steel silos are susceptible to instability under wind pressure when they are empty or only partially filled. Steel silos are widely used for storage of particulate solids. They are an integral part of many industries. They are almost always constructed from many short cylindrical shells of different thicknesses as the stress resultant on the wall progressively increases towards the base. Silos may be composed of flat or corrugated sheets. Different stiffening methods are employed in the design of these structures. The use of horizontal stiffening rings in the circumferential direction or vertical stiffeners along the meridional direction of the cylindrical shell are two paractical strengthening strategies. This paper investigates numerically the wind Buckling behavior of three steel silos. They are composed of flat sheets with stepped walls with multiple discrete steps in thickness. No stiffeners are used in the silos. In order to cover the main aspect ratios mentioned in Eurocode, three different silos were considered. The dimensions were chosen to have similar capacities for storage containers. The steel silos were designed by global numerical analysis using geometrically and materially non-linear analysis with imperfections (GMNIA) for the discharge loads according to Eurocode for wheat as the ensiled material. The vertical and circumferential distributions of Wind loading were adopted from Eurocode. Two proposed circumferential pressure distributions for an isolated silo and a silo in a group were taken into consideration. Where the silo does not have a closed roof, an additional uniform value of internal underpressure coefficient should be considered, thus increasing the net stagnation inward pressure on the silo walls. The effects of additional inward pressure on a vented silo with a small opening were specially explored through the paper. Therefore, a total of four different load cases were examined in this paper: isolated load case and grouped load case, each of them for silos with closed roof and for vented silos. Two types of analyses were undertaken for the wind Buckling assessment of the silos: the linear elastic bifurcation analysis (LBA) and the geometrically and materially non-linear analysis (GMNA). However, due to small wall thickness, the material non-linearity did not take place in non-linear wind Buckling analyses (GMNA=GNA). The Buckling mode obtained from LBA, characterized by one meridional half-wave and several circumferential half-waves of decaying sinusoidal form on the upper windward side of the silos. The GMNA buckle modes represented an approximately similar meridional half-wave found from LBA eigenmodes. Neverthless, in the circumferential direction, non-uniform buckle half-waves were expanded almost all around the silo walls with decaying amplitudes on the leeward side. More circumferential halfwaves were formed in the grouped load case in both LBA and GMNA, as well. According to non-linear load-deflection curves, the Buckling in all load cases was of snap-back type. The curves showed more non-linear charecteristics in group load case. Moreover, in general, the wind Buckling resistance of silos under grouped load case was less than isolated load case. Finally, silos with closed roof compared with vented silos with a small opening, exhibited about 40% more wind Buckling resistance.

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APA: Copy

Moazezi Mehretehran, Alireza, & Maleki, Shervin. (2019). Buckling assessment of cylindrical steel silos under wind loading. MODARES CIVIL ENGINEERING JOURNAL, 19(3 ), 227-239. SID. https://sid.ir/paper/256780/en

Vancouver: Copy

Moazezi Mehretehran Alireza, Maleki Shervin. Buckling assessment of cylindrical steel silos under wind loading. MODARES CIVIL ENGINEERING JOURNAL[Internet]. 2019;19(3 ):227-239. Available from: https://sid.ir/paper/256780/en

IEEE: Copy

Alireza Moazezi Mehretehran, and Shervin Maleki, “Buckling assessment of cylindrical steel silos under wind loading,” MODARES CIVIL ENGINEERING JOURNAL, vol. 19, no. 3 , pp. 227–239, 2019, [Online]. Available: https://sid.ir/paper/256780/en

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