Theoretical Analysis of Transfer Lengths in Pretensioned Prestressed Concrete Members
Publication: Journal of Engineering Mechanics
Volume 132, Issue 10
Abstract
The realistic design of pretensioned prestressed concrete members requires adequate determination of transfer length for prestress forces. The purpose of the present paper is to propose a rational theory, which can evaluate the transfer lengths realistically for arbitrary designed pretensioned members. The theory considers the prestressing steel as a solid cylinder and the surrounding concrete as a hollow cylinder. The compatibility condition is then imposed at the steel–concrete interface with an appropriate equilibrium equation. The possible cracking of surrounding concrete in a radial direction due to expansive pressure after prestress transfer has been considered by employing an appropriate tensile stress–crack width relation. The equilibrium equations are solved for each successive segment in longitudinal direction and the strain buildup curves from the end of pretensioned members are obtained, which provides the basis for the determination of transfer length. Comprehensive tests were conducted to measure the transfer lengths for various design variables, including the concrete strength, strand diameter, cover thickness, and strand spacing. The measured values of transfer lengths were compared with the calculated ones and the comparison indicates that the theoretical prediction exhibits good correlation with test data. The proposed theory allows more realistic prediction of transfer lengths for rational design of actual pretensioned prestressed concrete members.
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Acknowledgment
The support from National Research Laboratory (NRL) Program of Korea is greatly appreciated.
References
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© 2006 ASCE.
History
Received: Mar 24, 2004
Accepted: Mar 15, 2006
Published online: Oct 1, 2006
Published in print: Oct 2006
Notes
Note. Associate Editor: Yunping Xi
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