Results 131 to 140 of about 301 (182)

FATIGUE CHARACTERISTICS OF PRESTRESSING STRAND.

Proceedings of the Institution of Civil Engineers, 1972
THIS PAPER PRESENTS THE RESULTS OF 189 FATIGUE TESTS CARRIED OUT ON 12.7 MM DIAMETER THERMALIZED SEVEN-WIRE PRESTRESSING STRAND. THE EFFECT OF TEST LENGTH AND/OR LATERAL PRESSURE ON THE FATIGUE LIFE AT VARIOUS STRESS AMPLITUDES IS REPORTED TOGETHER WITH AN INVESTIGATION OF THE EFFECTS OF ABRASION.
AD EDWARDS, A PICARD
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Development Length of Prestressing Strands

PCI Journal, 1977
Based on an extensive literature survey of bond development, the authors propose a new equation for the transfer length of prestressing strand. This equation accounts for the effects of strand size, initial prestress, and concrete strength at transfer, and is applicable to concrete strengths ranging from 2000 to 8000 psi.
Talat Mostafa, Paul Zia
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Influence of corrosion on prestress strands

Canadian Journal of Civil Engineering, 1999
Corrosion on prestress strands affects their mechanical properties as well as the coefficient of friction in the surface strand/duct. In previous research on prestress beams, the authors have observed different coefficients of friction depending on the surface condition of the strands and wires used in investigation.
S.M.R. Lopes, L.M.L.P. Simões
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Fatigue of Prestressed Concrete Beams with Inclined Strands

Journal of Structural Engineering, 1994
This paper presents the results of laboratory cyclic testing of preten-sioned 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.
Muller J.F., Dux P.F.
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Effect of Reduced Bond of Prestressed Strands

Solid State Phenomena, 2016
Bond of prestressing strands may be reduced by using protective coatings against corrosion during winter period, when early grouting of ducts may be impossible. It was not verified if the reduced bond has an influence on the performance of the post-tensioned structures.
Jan L. Vítek, David Čítek
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Bond characteristics of untensioned prestressing strand

PCI Journal, 1977
The bond behavior of untensioned prestressing strand was studied to evaluate load-deformation characteristics as well as load-embedment requirements. The results of the study are applicable to bonded untensioned strand as reinforcing for concrete in particular for connection between precast elements.
John R. Salmons, Timothy E. McCrate
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Transfer Control of Prestressing Strands

PCI Journal, 1992
Based on a particular bond stress-slip relationship, nonlinear equations are developed for the transfer length and for the draw-in of prestressing strands taking into account the effective or the initial prestress, the concrete strength at transfer and the strand size. These equations can be used as the end block design of a prestressed concrete member
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Bond Modelling of Prestressing Strand

SP-180: Bond and Development of Reinforcement - A Tribute to Dr. Peter Gergely, 1998
From pull-out and push-in tests on specimens with short embedment length an empirical relation has been derived, which describes the local bond stress as a function of the local slip and steel stress change. With the help of this bond model the transfer length and the bi-linear relationship for the development length of a pretensioned strand (ACI ...
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Pullout Capacity of Non-Prestressed Bent Strands for Prestressed Concrete Girders

PCI Journal, 2002
In a recently concluded investigation on shear limits in precast, prestressed concrete girders for the Nebraska Department of Roads (NDOR), it was determined that the AASHTO LRFD limit for maximum shear reinforcement is attainable as long as an adequate number of strands is anchored into the abutment diaphragms.
Panya Noppakunwijai, Nipon Jongpitakseel, Zhongguo (John) Ma, Sherif A. Yehia, Maher K. Tadros   +4 more
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Transfer Length of Prestressing Strand as a Function of Draw-In and Initial Prestress

PCI Journal, 1993
Guyon's formula expresses the transfer length of a prestressing tendon as a function of both the initial prestress and the draw-in. A modification of Guyon's formula is proposed which can take into account not only constant and linear behavior but also any nonlinear bond stress distribution over the transfer length.
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