Structural Engineering and Mechanics

  • 제76권1호
  • /
  • Pages.67-81
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  • 2020
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  • 1225-4568(pISSN)
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  • 1598-6217(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

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)
  • 투고 : 2019.12.02
  • 심사 : 2020.05.18
  • 발행 : 2020.10.10
⟨ 이전 논문 다음 논문 ⟩

초록

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.

키워드

과제정보

This research is supported by the University of Arkansas at Fayetteville and the Ton Duc Thang University. The authors would like to thank Insteel Industries Inc. for providing the strands for this research. The authors also would like to thank a number of individuals at the University of Arkansas for their contribution in this study.

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