Hoop Tension Loss and Elastic Shortening in Concrete Stave Silos

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Title: Hoop Tension Loss and Elastic Shortening in Concrete Stave Silos

Author(s): Harold S. Kleywegt and Jan C. Jofriet

Publication: Concrete International

Volume: 1

Issue: 8

Appears on pages(s): 28-30

Keywords: circular prestressing; prestressed con-crete; prestress loss; silos.

Date: 8/1/1979

Abstract:
Concrete stave silos are prestressed by external steel hooping. The tension in the silo hoops is subject to loss of prestress due to friction, elastic shortening, creep, and shrinkage. This paper deals with the elastic shortening loss of prestress. Experimental results obtained from a 4.9 m (16 ft) x 3.8 m (12.5 ft) high stave silo were considerably greater than would be expected in a homogeneous structure. An analytical model for predicting elastic shortening loss is proposed. Recommendations for reducing elastic shortening loss are provided. [Authors]