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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Use of Large Tendons in Pre-Tensioned Concrete
Author(s): Niels Thorsen
Publication: Journal Proceedings
Appears on pages(s): 649-659
Keywords: no keywords
Abstract:The use of a few large tendons in pre-tensioned concrete construction instead of many small ones, cuts field costs and simplifies design. This is especially true for heavy members. Physical properties of tendons are tabulated for average plant-produced steels based on stress-relieved and as-drawn material. Precautions and tests for evaluating tendons are discussed. It is shown that the bond in the end zones of a pre-tensioned member differs from the bond in the interior zones. Both types of bond can be determined by a curve indicating the maximum tension which can be absorbed in a tendon, without slip, at various distances from theend of a member. Methods of determining such curves or part thereof are explained. When using large tendons, secondary stresses in end zones of pre-tensioned members become important and may cause cracking if special care is not taken in the design. The use of a few general rules to prevent such cracks are indicated. A few examples of practical applications of large tendons are described Some future possibilities are discussed such as the use of bond breaking devices in end zones of pre-tensioned members and curved tendons.
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