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Concrete Confined by Noncompliant Continuously Wound Ties

Mosier, Elizabeth
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1684772045965747

Abstract Details

2023, MS, University of Cincinnati, Engineering and Applied Science: Civil Engineering.
Continuously wound ties (CWTs), continuous hoops wound from a single piece of reinforcing bar, have been increasing in use as an alternative to conventional steel reinforcing ties due to decreased material waste and increased constructability. In addition to saving material and improving constructability, CWTs are assumed to improve confinement of the concrete core and tie anchorage. However, CWTs are not recognized in the American Concrete Institute (ACI) 318-19 Building Code and are, therefore, assumed to have a similar structural performance as conventional ties (CON). This thesis project includes the design, testing, and analysis of (8) CWT specimens and (2) CON specimens, focusing on comparisons between ACI compliant and noncompliant CWT tie spacing. Other comparisons to be made include the performance of specimens reinforced with CWTs versus conventionally reinforced specimens, specimens with every bar supported versus specimens with every-other bar supported, and specimens with high-strength reinforcement (HSR) and high-strength concrete (HSC) versus specimens with normal-strength reinforcement (NSR) and normal-strength concrete (NSC). An additional objective was to record and assess stress-strain relationship of concrete confined by CWTs against existing models. Based on the project data, the following conclusions and observations are drawn: There is very little difference between noncompliant and compliant specimens in terms of normalized strength. Ductility decreased by 40% when spacing did not comply with ACI code. Strain at f'cc and strain at 0.85f'cc decreased by 50% and 45%, respectively, when spacing did not comply with code. Mander, Priestley, and Park model overestimated f'cc, e1, and e85. However, this model was 10% more accurate when predicting f'cc for specimens with noncompliant spacing rather than compliant spacing. This model was 22% more accurate when predicting e1 for specimens with compliant spacing rather than noncompliant spacing. Saatcioglu and Razvi model overestimated f'cc, e1, and e85. However, this model was 33% more accurate when predicting e1 for specimens with compliant spacing rather than noncompliant spacing. Razvi and Saatcioglu model overestimated f'cc, e1, and e85. However, this model was 12% more accurate when predicting f'cc for specimens with noncompliant spacing rather than compliant spacing. This model was 24% more accurate when predicting e1 for specimens with compliant spacing rather than noncompliant spacing.
Bahram Shahrooz, Ph.D. (Committee Chair)
Richard Miller, Ph.D. (Committee Member)
Julienne Cromwell, M.S (Committee Member)
244 p.
Civil Engineering
Continuously Wound Ties; Special Boundary Elements; Hoops/Ties; Confined Concrete; Confinement; Seismic Design

Recommended Citations

Citations

  • Mosier, E. (2023). Concrete Confined by Noncompliant Continuously Wound Ties [Master's thesis, University of Cincinnati]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1684772045965747

    APA Style (7th edition)

  • Mosier, Elizabeth. Concrete Confined by Noncompliant Continuously Wound Ties. 2023. University of Cincinnati, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ucin1684772045965747.

    MLA Style (8th edition)

  • Mosier, Elizabeth. "Concrete Confined by Noncompliant Continuously Wound Ties." Master's thesis, University of Cincinnati, 2023. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1684772045965747

    Chicago Manual of Style (17th edition)

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This open access ETD is published by University of Cincinnati and OhioLINK.