Fatigue of Prestressed Concrete Beams with Inclined Strands
Publication: Journal of Structural Engineering
Volume 120, Issue 4
Abstract
This paper presents the results of laboratory cyclic testing of pretensioned concrete beams with hold‐downs operating in the cracked or partially prestressed condition. It is shown that the fatigue life of inclined strand is low due to flexural action in strand at cracks. This results from the noncoincidence of crack‐opening direction and strand direction. A pattern of regular, fine cracks is desirable. However, the usual pattern features dominant cracking at hold‐downs. Based on experimental data a lower‐bound fatigue‐life equation is proposed. The equation indicates that for a fatigue life of 2,000,000 cycles the stress range in inclined strand should be restricted to 70 MPa for either pretensioned or posttensioned construction. The research suggests that in situations where heavy service loadings are frequent (e.g. railway bridges on heavy haul coal and mineral lines), partially prestressed design featuring inclined strand should be avoided.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 120 • Issue 4 • April 1994
Pages: 1122 - 1139
Copyright
Copyright © 1994 American Society of Civil Engineers.
History
Received: May 26, 1992
Published online: Apr 1, 1994
Published in print: Apr 1994
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