Tension Stiffening Behavior of GFRP-Reinforced Concrete

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Title: Tension Stiffening Behavior of GFRP-Reinforced Concrete

Author(s): H. Sooriyaarachchi, K. Pilakoutas, and E. Byars

Publication: Special Publication

Volume: 230

Issue:

Appears on pages(s): 975-990

Keywords: bar diameter; bond (concrete to reinforcement); GFRP-RC;reinforcement ratio; strain patterns; tension stiffening

Date: 10/1/2005

Abstract:
This paper presents an experimental study into the structural response ofGlass Fiber Reinforced Polymers Reinforced Concrete (GFRP-RC) tension members. Theinfluence of concrete strength, reinforcement ratio and bar diameter on tensionstiffening is investigated by testing elements in direct tension. Using bars speciallymanufactured with internal strain gauges, typical strain patterns occurring betweencracks during direct tension tests were measured and bond stresses derived, therebyobtaining the information for modeling tension stiffening behavior of GFRP-RC. Anincrease in the tension stiffening behavior with decrease in reinforcement ratio andincrease in concrete strength was observed. No appreciable change in tensionstiffening was recorded with changes in bar diameter at constant reinforcement ratio.This paper also discusses the limitations that may be encountered in modifying currentmodels to represent the tension stiffening effect of GFRP-RC.