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http://dx.doi.org/10.12989/sem.2020.76.1.067

Bond mechanism of 18-mm prestressing strands: New insights and design applications  

Dang, Canh N. (Department for Management of Science and Technology Development, Ton Duc Thang University)
Marti-Vargas, Jose R. (Institute of Concrete Science and Technology (ICITECH), Universitat Politecnica de Valencia)
Hale, W. Micah (University of Arkansas, Department of Civil Engineering)
Publication Information
Structural Engineering and Mechanics / v.76, no.1, 2020 , pp. 67-81 More about this Journal
Abstract
Pretensioned concrete (PC) is widely used in contemporary construction. Bond of prestressing strand is significant for composite-action between the strand and concrete in the transfer and flexural-bond zones of PC members. This study develops a new methodology for quantifying the bond of 18-mm prestressing strand in PC members based on results of a pullout test, the Standard Test for Strand Bond (STSB). The experimental program includes: (a) twenty-four pretensioned concrete beams, using a wide range of concrete compressive strength; and (b) twelve untensioned pullout specimens. By testing beams, the transfer length, flexural-bond length, and development length were all measured. In the STSB, the pullout forces for the strands were measured. Experimental results indicate a significant relationship between the bond of prestressing strand to the code-established design parameters, such as transfer length and development length. However, the code-predictions can be unconservative for the prestressing strands having a low STSB pullout force. Three simplified bond equations are proposed for the design applications of PC members.
Keywords
pretensioned concrete; prestressing strand; bond; transfer length; development length; STSB; design application;
Citations & Related Records
Times Cited By KSCI : 7  (Citation Analysis)
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