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The IUP Journal of Structural Engineering

Wind-Induced Ovalling Effect on Cylindrical Wall of Ground Elevated Empty Reinforced Concrete Silo

Article Details

Pub. Date	: April, 2021
Product Name	: The IUP Journal of Structural Engineering
Product Type	: Article
Product Code	: IJSE10421
Author Name	: Amiya K Samanta
Availability	: YES
Subject/Domain	: Science and Technology
Download Format	: PDF Format
No. of Pages	: 20

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Abstract

Wind-induced ovalling effect on the cylindrical wall of single flexible empty steel silo has been studied by various investigators in the past. The paper presents the same effect on cylindrical wall of ground elevated rigid (reinforced concrete) silo using a very simplified analytical approach, which may easily be accessed by practicing engineers for the purpose of design. An approximate analysis of circular cross-section of silo is performed to evaluate the effect of ovalling, but the same is much on conservative end, and also it cannot provide the effect to be taken into consideration for the entire height of the silo. To make the design procedure simple and cost-effective, a few case studies have been performed using the actual wind load distribution and numerical/finite element model in Abaqus. The results obtained from the three-dimensional finite element model of the silo show that the values of deformation and stresses obtained are much on lower end compared to the results of approximate analysis in bending of silo wall, whereas it also evaluates longitudinal stress which is equally significant. The paper also proposes graphs/charts to derive a modification factor over the values obtained by analytical/approximate method so that the designers and practicing professionals may take appropriate measures in the process of designing and detailing of the silo wall without going for detailed investigation of the model under consideration.

Description

Ground elevated Reinforced Concrete (RC) cylindrical silo is one of the important structures in the coal industries, cement industries, power plants and other similar industrial applications. The necessity to store huge materials, e.g., coke, coal, cement and food grains, and to supply the same throughout the year has led the industry to choose a configuration in terms of both economy in design and in construction methodology (e.g., slip-forming, etc.). The design of silos is mainly concerned with the functional and structural considerations. Functional design provides adequate volume, proper protection of the stored materials and satisfactory method of housing of necessary equipment to facilitate the filling and discharging procedures of stored materials, whereas structural design includes checking of stability, strength and control (minimizing) of crack width and deflection.