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Simulation of the Effect of Deck Cracking on the Behavior of the Prestressing Force in a Single Span Prestressed Concrete Girder

Vadlamani, Soumya
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1505127202585872

Abstract Details

2017, MS, University of Cincinnati, Engineering and Applied Science: Civil Engineering.
The current AASHTO LRFD Bridge Design Specifications have a Refined Method for calculating the time-dependent prestress losses, which estimates a gain in the prestressing force due to the differential shrinkage between the girder and the deck. However, the method does not consider the possibility of cracking in the deck. When the deck cracks, some stress is relieved from the girder and some, but not all, of the gain in the prestress is lost. Not all state departments of transportation allow the gain in prestressing force to be included in the prestress loss calculations as it is very small, often 2-3%, and may be lost when the deck cracks. Some other state departments of transportation believe that upon cracking, not all of the gain is lost and they allow some percentage (often 50%) of the gain to be included. The Prestressed/Precast Concrete Institute Bridge Design Manual recommends including the entire gain. Three different length models were simulated using the ABAQUS finite element software. The variables considered were the deck strength, deck shrinkage coefficient, girder type and the age of the girder at the time of casting the slab. Simulations were done in two broad categories; one where the cracking in the deck was most likely and the other where it was least likely. To see the effect of deck cracking on the prestressing force, it was important to know whether the deck would always crack or if there were circumstances where the deck would not crack. It was observed that for all times of deck placement considered in this study, the deck always cracked although the amount of cracking varied. Upon cracking, the deck continued to provide some restraint to the girder. Post-cracking, all of the gain in the prestressing force was not lost and nearly half of the gain was retained. It seems reasonable to use 50% of the gain due to differential shrinkage, in the overall prestress loss calculations.
Richard Miller (Committee Chair)
Thomas| Burns (Committee Member)
Gian Andrea Rassati| (Committee Member)
125 p.
Civil Engineering
Differential Shrinkage; Cracking; Prestress Gain; Refined Method; Camber; Creep

Recommended Citations

Citations

  • Vadlamani, S. (2017). Simulation of the Effect of Deck Cracking on the Behavior of the Prestressing Force in a Single Span Prestressed Concrete Girder [Master's thesis, University of Cincinnati]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1505127202585872

    APA Style (7th edition)

  • Vadlamani, Soumya. Simulation of the Effect of Deck Cracking on the Behavior of the Prestressing Force in a Single Span Prestressed Concrete Girder. 2017. University of Cincinnati, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ucin1505127202585872.

    MLA Style (8th edition)

  • Vadlamani, Soumya. "Simulation of the Effect of Deck Cracking on the Behavior of the Prestressing Force in a Single Span Prestressed Concrete Girder." Master's thesis, University of Cincinnati, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1505127202585872

    Chicago Manual of Style (17th edition)

ucin1505127202585872
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© 2017, some rights reserved.Creative Commons License Simulation of the Effect of Deck Cracking on the Behavior of the Prestressing Force in a Single Span Prestressed Concrete Girder by Soumya Vadlamani is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License. Based on a work at etd.ohiolink.edu.
This open access ETD is published by University of Cincinnati and OhioLINK.