Type of Document	Dissertation
Author	Robinson, Brenda
Author's Email Address	robinbr@eng.fsu.edu
URN	etd-12222007-002635
Title	Performance of Post-Tensioned Concrete Anchorage Zones with Steel Fiber Reinforced Concrete
Degree	Doctor of Philosophy
Department	Civil and Environmental Engineering, Department of
Advisory Committee	Advisor Name Title Kamal S. Tawfiq Committee Chair Makola M. Abdullah Committee Member Peter N. Kalu Committee Member Primus V. Mtenga Committee Member
Keywords	Steel Zones Anchorage Concrete Fiber Post-tensioned Reinforced Bridge
Date of Defense	2007-11-14
Availability	unrestricted
Abstract 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.
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