Static Pressures in Concrete Circular Silos Storing Granular Materials


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Title: Static Pressures in Concrete Circular Silos Storing Granular Materials

Author(s): Alfred G. Bishara, Sherif F. Ayoub, and Abdalla Sorour Mahdy

Publication: Journal Proceedings

Volume: 80

Issue: 3

Appears on pages(s): 210-216

Keywords: finite element method; granular materials; lateral pressure; pressure;regression analysis; shear modulus; silos; stresses; stress-strain relationships;statistical analysis.

Date: 5/1/1983

Generalized constitutive laws for granular materials as well as simple expressions for the evaluation of static lateral and vertical pressures in circular silos are presented. The generalized constitutive laws were developed from statistical analysis of results from tests performed on representative granular materialsdivided into coarse and fine catagories. The pressure expressions were obtained using nonlinear regression analysis of a large number of finite element solutions for granular maerials stored in silos whose diameters range from 16 to 40 ft (4.88 to 12.19 m) and heights vary from 40 to 100 ft (12.19 to 30.5 m) The finite element program used was ana adaptation to a nonlinear finite element program orginally developed for nonlinear viscoelstic materils by Bishara et al. in which the ensiled material was assumed as an isotropic nonlinear visoelastic continum contained in an elastic cylinder, with special provision to allow for the slip-stick phenomenon at the silo wall/material interface.