Serviceability check of pretensioned concrete members reinforced with 2,400 Mpa high strength prestressing strnads

Hyo Eun Joo, Sun Jin Han, Hyunjin Ju, Seung Ho Choi, Min Kook Park, Kang Su Kim

Research output: Contribution to journalArticlepeer-review

Abstract

In recent years, high strength 7-wire strands that have a 2,400 MPa tensile strength were developed, for which the serviceability check specified in ACI318-14 and KCI 2012 need to be reviewed. The current design codes (KCI 2012 or ACI318-14) permitted that the tensile stress of reinforcing bars at service loads can be assumed as two-thirds of their yield strengths. However, they restricted the net tensile stress of the prestressing strands in Class C prestressed concrete (PSC) members at service loads (∆fps) to be less than 250 MPa regardless of the tensile strengths of prestressing strands. Therefore, in this study, a parametric analysis was conducted on the PSC members reinforced with 2,400 MPa high strength prestressing strands considering the key influential factors on the ∆fps, such as shape and size of section, partial prestressing ratio (PPR), reinforcing index (w), and magnitude of effective prestress (fse). The analysis results showed that the ∆fps is not affected by section size, and decreases in accordance with increasing fse, PPR, and cracking moment to service moment ratio (Mcr/Mservice). Based on the analysis results, a simple design table was suggested to check if the ∆fps satisfies its limitation at the design stages, which does not require any complex iterative calculations for checking ∆fps.

Original languageEnglish
Pages (from-to)75-82
Number of pages8
JournalJournal of the Korea Concrete Institute
Volume30
Issue number1
DOIs
Publication statusPublished - Jan 1 2018
Externally publishedYes

Keywords

  • 2,400 MPa strands
  • Non-linear analysis
  • Prestresssed concrete
  • Serviceability
  • Tensile stress

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Mechanics of Materials
  • Building and Construction
  • Materials Science (miscellaneous)

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