Local Bond-Slip Characteristics of G-FRP Bars


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Title: Local Bond-Slip Characteristics of G-FRP Bars

Author(s): S.P. Tastani, S.J. Pantazopoulou, and P. Karvounis

Publication: Special Publication

Volume: 230


Appears on pages(s): 1481-1496

Keywords: bar diameter; bar roughness; FRP reinforcement; localbond; slip

Date: 10/1/2005

In this paper local bond-slip relationships of GFRP bars in normal strengthconcrete are evaluated experimentally through testing of 30 direct-tension pulloutspecimens. In all cases short anchorages are examined. A novel type of test specimenwas used in the study specially designed so as to minimize the spurious influence oftesting conditions on measured bond properties. Parameters considered in theexperimental investigation were the bar roughness and diameter, the size effectexpressed by the constant cover to bar diameter ratio and the external pressureexerted by transverse FRP jacket over the anchorage zone. Response variables used toevaluate performance were the load developed by the anchorage, the loaded-end slipand the transverse displacement occurring over the length of embedment, recorded byconventional instruments as well as through digital image processing. Results of thestudy are summarized in the form of local bond-slip curves for this type of GFRPreinforcement, whereby performance limit states are quantified in terms of slip andmobilized strength.