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Performance of Post-Tensioned Concrete Anchorage Zones with Steel Fiber Reinforced Concrete

Title: Performance of Post-Tensioned Concrete Anchorage Zones with Steel Fiber Reinforced Concrete.
Name(s): Robinson, Brenda, author
Tawfiq, Kamal S., professor directing dissertation
Kalu, Peter N., outside committee member
Mtenga, Primus V., committee member
Abdullah, Makola M., 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: 2008
Publisher: Florida State University
Place of Publication: Tallahassee, Florida
Physical Form: computer
online resource
Extent: 1 online resource
Language(s): English
Abstract/Description: The main objective of this research was to investigate the use of steel fiber reinforced concrete (SFRC) in post-tensioning (PT) anchorage zones of bridge girders. The purpose of using SFRC is to enhance the overall performance and to reduce the amount of steel rebar required in the anchorage zone. Reducing steel congestion in post-tensioning anchorage zones can improve the constructability of post-tensioned bridge elements. It was the intent of this investigation of the post-tensioning anchorage zone to consider both the behavior of the local zone and the general zone when steel fiber reinforced concrete is used. To achieve the objectives of this study, both experimental and analytical investigations were conducted aiming at reducing the amount of mild steel reinforcement required by the AASHTO code at the anchorage zone. The experimental part of the study involved laboratory testing of twenty-seven (27) samples representing typical anchorage zone dimensions in post-tensioned girders. The analytical study was conducted using non-linear finite element analysis in order to have a comprehensive stress analysis of the anchorage zones with and without fiber reinforcement and mild steel. Comparison of experimental and analytical results showed that the addition of steel fibers could enhance the performance of post-tensioned anchorage zones and reduce the bursting and confinement mild reinforcement required in these zones. For anchorage specimens with b/h equals to 0.22 and 0.33, it was found that the addition of 0.5 percent steel fibers by volume was enough to decrease the mild steel reinforcement by 40 percent or more. Results from this investigation suggested that the addition of steel fibers to concrete post-tensioned anchorage zones may save labor cost and time but may not significantly change the overall project costs.
Identifier: FSU_migr_etd-1949 (IID)
Submitted Note: A Dissertation Submitted to the Department of Civil & Environmental Engineering in Partial Fulfillment of the Requirements for the Degree of Doctor of Philosophy.
Degree Awarded: Spring Semester, 2008.
Date of Defense: November 14, 2007.
Keywords: Steel, Zones, Anchorage, Concrete, Fiber, Post-tensioned, Reinforced, Bridge
Bibliography Note: Includes bibliographical references.
Advisory committee: Kamal S. Tawfiq, Professor Directing Dissertation; Peter N. Kalu, Outside Committee Member; Primus V. Mtenga, Committee Member; Makola M. Abdullah, Committee Member.
Subject(s): Civil engineering
Environmental engineering
Persistent Link to This Record:
Owner Institution: FSU

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Robinson, B. (2008). Performance of Post-Tensioned Concrete Anchorage Zones with Steel Fiber Reinforced Concrete. Retrieved from