Tensile Strength Characteristics of GFRP Bars in Concrete Beams with Work Cracks under Sustained Loading and Severe Environments
来源期刊：Journal Of Wuhan University Of Technology Materials Science Edition2013年第5期
论文作者：何雄君 YANG Jingnan Charles E Bakis
文章页码：934 - 937
摘 要：To investigate the effect of different environmental conditions of GFRP bars in concrete beams with work cracks subjected to sustained loads,the beams were exposed in indoor,freeze/thaw cycles and immersed in alkaline solution at elevated temperature.The bars were carefully extracted from the beams and tested in order to evaluate residual tensile properties.The results show that the tensile strength decreased significantly in the highly aggressive conditions but not in the natural conditions.The effect of GFRP bars casting in concrete beams demonstrated approximately 2.5% decrease of tensile strength caused by pore water environment in concrete beams on basis of those of the original bars.The effect of sustained loading plus work cracks demonstrated about 10.5% tensile strength decrease on basis of those of the bars only casted in concrete beams.The effect of environments under sustained loading plus work cracks demonstrated about 17% tensile strength decrease caused by a saturated solution of Ca（OH） 2 and 60±2 ℃ tap water（pH=12-13） and about 8% tensile strength decrease caused by freezing and thawing cycle（F/T）,both on basis of those of the bars of the indoor beams only under sustained loading plus work cracks.The results demonstrate the effects of the tensile strengths under different environmental conditions of GFRP bars in concrete beams with work cracks subjected to sustained loads.
何雄君1，YANG Jingnan1，Charles E Bakis2
1. School of Transportation,Wuhan University of Technology2. Department of Engineering Science and Mechanics, Pennsylvania State University,University Park
摘 要：To investigate the effect of different environmental conditions of GFRP bars in concrete beams with work cracks subjected to sustained loads,the beams were exposed in indoor,freeze/thaw cycles and immersed in alkaline solution at elevated temperature.The bars were carefully extracted from the beams and tested in order to evaluate residual tensile properties.The results show that the tensile strength decreased significantly in the highly aggressive conditions but not in the natural conditions.The effect of GFRP bars casting in concrete beams demonstrated approximately 2.5% decrease of tensile strength caused by pore water environment in concrete beams on basis of those of the original bars.The effect of sustained loading plus work cracks demonstrated about 10.5% tensile strength decrease on basis of those of the bars only casted in concrete beams.The effect of environments under sustained loading plus work cracks demonstrated about 17% tensile strength decrease caused by a saturated solution of Ca（OH） 2 and 60±2 ℃ tap water（pH=12-13） and about 8% tensile strength decrease caused by freezing and thawing cycle（F/T）,both on basis of those of the bars of the indoor beams only under sustained loading plus work cracks.The results demonstrate the effects of the tensile strengths under different environmental conditions of GFRP bars in concrete beams with work cracks subjected to sustained loads.
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