Use of Steel Fiber Reinforced Concrete in Anchorage Zone of Post-Tensioned Concrete Girders

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Title: Use of Steel Fiber Reinforced Concrete in Anchorage Zone of Post-Tensioned Concrete Girders

Author(s): Kamal S. Tawfiq, Brenda Robinson, and Nur Yazdani

Publication: Special Publication

Volume: 276

Issue:

Appears on pages(s): 1-18

Keywords: anchorage zones, general zone, post-tensioning, steel fibers

Date: 3/1/2011

Abstract:
The objective of this study was to investigate the possibility of using steel fiber reinforced concrete (SFRC) to enhance the performance of in the anchorage zone and to minimize the amount of mild steel reinforcement required by the code. For that purpose, different ratios per volume of different steel fibers were used in the study. The basic SFRC properties were obtained and then used in a thorough finite element analysis on 3D models of SFRC blocks representing the anchorage zone. The purpose of the numerical analysis was to define the proper dimensions of the need block specimens for laboratory testing, and to determine the locations of the internal and external strain gages in the block. Test results showed that the addition of steel fibers improved the loading capacity of the anchorage blocks. Further finite element analysis on 3D models proved that addition of 0.5 percent by volume of fiber was enough to reduce the mild steel reinforcement at the anchorage zone by about 40 percent. However, such an option needs to be dealt with caution. The addition of steel fiber to substitute mild steel could result in an abrupt failure in the anchorage zone.