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Synthesis Study on Load Capacity of Concrete Slabs without Plans

Gearhart, Gregory P, Jr.
http://orcid.org/0000-0002-5155-1289
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1522057637077884

Abstract Details

2018, MS, University of Cincinnati, Engineering and Applied Science: Civil Engineering.
According to the Ohio Department of Transportation (ODOT) there are over 1200 concrete slab bridges across the state that are still in use, but are missing plans and/or specifications. These documents contain the information necessary to determine the strength of the bridge, which is needed for rating. The strength of a concrete slab bridge depends on its geometry, support conditions, concrete strength, reinforcing bar size, reinforcing bar spacing, effective depth, and the yield strength of the reinforcing steel. This study determined methodologies to find or reasonably estimate the unknown properties using mainly non-destructive testing (NDT) procedures or historical records. A detailed literature review was performed to determine the accuracy, reliability, and ease of use of the applicable NDT methods. In addition, a survey was sent to city/county engineers to determine their methods for identifying unknown properties (if any) and to collect information on historical records of materials and designs used in slab bridges. Those methods identified in the literature review and survey were then used in blind tests on slab bridges with known properties to verify the use of NDT methods. Lab testing was also performed to investigate the relationship between yield strength and other material properties. The results show the unknown properties can be identified using non-destructive testing techniques. For simplicity, flow charts have been developed to walk an engineer through the steps of determining the strength of slab bridges without plans. Using the flow charts, the proposed methodologies can identify bar size within ±1 bar size, effective depth within a ¼ of an inch, spacing within 3/8 of an inch, concrete strength within 30%, and yield strength within 5 ksi.
Richard Miller, Ph.D. (Committee Chair)
Bahram Shahrooz, Ph.D. (Committee Member)
James Swanson, Ph.D. (Committee Member)
91 p.
Civil Engineering
non-destructive testing; rebar size; effective depth; rebar spacing; concrete strength; yield strength

Recommended Citations

Citations

  • Gearhart, Jr., G. P. (2018). Synthesis Study on Load Capacity of Concrete Slabs without Plans [Master's thesis, University of Cincinnati]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1522057637077884

    APA Style (7th edition)

  • Gearhart, Jr., Gregory. Synthesis Study on Load Capacity of Concrete Slabs without Plans. 2018. University of Cincinnati, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ucin1522057637077884.

    MLA Style (8th edition)

  • Gearhart, Jr., Gregory. "Synthesis Study on Load Capacity of Concrete Slabs without Plans." Master's thesis, University of Cincinnati, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1522057637077884

    Chicago Manual of Style (17th edition)

ucin1522057637077884
290
© 2018, all rights reserved.
This open access ETD is published by University of Cincinnati and OhioLINK.
Release 3.2.12