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Exploration of Monostrand Use in Segmental Box Girder Bridges

Title: Exploration of Monostrand Use in Segmental Box Girder Bridges.
Name(s): Spear, Herbert Houston, author
Rambo-Roddenberry, Michelle, professor directing thesis
Spainhour, Lisa, committee member
Tawfiq, Kamal, committee member
Department of Civil and Environmental Engineering, degree granting department
Florida State University, degree granting institution
Type of Resource: text
Genre: Text
Issuance: monographic
Date Issued: 2010
Publisher: Florida State University
Place of Publication: Tallahassee, Florida
Physical Form: computer
online resource
Extent: 1 online resource
Language(s): English
Abstract/Description: For the past several decades the segmental box girder bridge has proven itself to be one of the more efficient bridge types. Using reusable form work, segments are match-cast, ensuring a more perfect connection during the construction phase. These benefits in conjunction with the fact that the costs of startup and form work are absorbed into the total cost of each segment mean that the longer the final bridge is, the less the cost is per segment, making the segmental box girder bridge one of the most popular long bridge types constructed in the U.S. To minimize cost, it is important to design each segment for efficiency in terms of quantity of longitudinal and transverse post-tensioning and reinforcing steel. The inclusion of post-tensioning technology results in an overall compressive state in the longitudinal and transverse directions of the segments, improving structure strength and service life. However, despite the benefits inherent in using post-tensioning technology, the webs still contain standard deformed reinforcement. The goal of this research is to fit a greased and sheathed monostrand within a segment in a way that both webs and bottom flange would be placed in a state of compression, thereby reducing the demand for standard web reinforcement and, hopefully, segment cost. The research objectives include analyzing principal stresses in the webs of the segment, modifying the segment so as to restrain the monostrand within the webs, designing any additional reinforcement that may be necessary, and finally comparing the estimated construction cost of the new design with that of a pre-existing structure. The results from this research have shown that it is indeed possible to place a greased and sheathed monostrand within the webs of a segment with beneficial results and that the demand for standard deformed reinforcement will thus be reduced.
Identifier: FSU_migr_etd-0375 (IID)
Submitted Note: A Thesis submitted to the Department of Civil and Environmental Engineering in partial fulfillment of the requirements for the degree of Master of Science.
Degree Awarded: Degree Awarded: Spring Semester, 2010.
Date of Defense: Date of Defense: April 2, 2010.
Keywords: Segmental, Box girder, Bridges, Monostrand, Post-Tensioning
Bibliography Note: Includes bibliographical references.
Advisory committee: Michelle Rambo-Roddenberry, Professor Directing Thesis; Lisa Spainhour, Committee Member; Kamal Tawfiq, Committee Member.
Subject(s): Civil engineering
Environmental engineering
Persistent Link to This Record:
Host Institution: FSU

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Spear, H. H. (2010). Exploration of Monostrand Use in Segmental Box Girder Bridges. Retrieved from