Creep Behavior and Tensile Properties of GFRP Bars under Sustained Service Loads

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Title: Creep Behavior and Tensile Properties of GFRP Bars under Sustained Service Loads

Author(s): T. Youssef and B. Benmokrane

Publication: Special Publication

Volume: 275

Issue:

Appears on pages(s): 1-20

Keywords: Glass fiber-reinforced polymers (GFRP), Reinforcing bars, Creep Behavior, Serviceability, Sustained service load, Strain

Date: 3/1/2011

Abstract:
Creep tests have been conducted on six commercial GFRP bars, pertaining to three different manufacturers, under two levels of sustained service load (nominally 15% and 30% of the ultimate tensile strength). The test duration was 10000 hours (417 days). At the end of the test duration, the samples were tested statically to infer upon their residual tensile properties. It is evident that GFRP bars with lower fiber content and/or bigger diameter exhibit higher levels of creep strain than their counterparts of high fiber content and smaller diameter. Residual tensile property tests show barely any change as to the bars’ longitudinal tensile properties. Microstructural analysis indicates that there is no degradation in the matrix or the fiber-matrix interface, within the GFRP bars after the lengthy duration.