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| EFFECT OF LOADING RATE ON TENSILE PROPERTIES OF FULL-SCALE SPECIMEN OF LARGE-DIAMETER GLASS FIBER REINFORCED POLYMER(GFRP) BAR |
| LI Guowei1，2，GE Wanming2，NI Chun2，DAI Jian2，MU Chunlin3 |
| (1. Key Laboratory of Ministry of Education for Geotechnique and Embankment Engineering，Hohai University，Nanjing，Jiangsu 210098，China；2. Geotechnical Research Institute，Hohai University，Nanjing，Jiangsu 210098，China；3. Zhongshan Pulwell Composites Company Ltd.，Zhongshan，Guangdong 528400，China) |
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Abstract The glass fiber reinforced polymer(GFRP) bar is a new reinforcement material composed of glass fiber and resin，and has good application prospects. The GFRP bar has the properties of anisotropy. Its horizontal compressive strength far less than axial tensile strength；and it has remarkable size effect. Therefore，the strength index testing of GFRP is more complex than that of steel. The end anchorage problem of large-diameter full-scale GFRP test specimen is solved by laboratory test. Through the tensile test of full-scale specimen of large-diameter GFRP in the tensile testing machine，the variation laws of the basic mechanical properties of large-diameter glass fiber bar，such as tensile strength，tensile elastic modulus and elongation ratio，are studied under different loading rates. In addition，the failure mechanisms between the GFRP bar and steel bar are compared. The experimental results demonstrate that，with increase of loading rate，the tensile strength and elongation ratio of GFRP bar increase significantly，while the elastic modulus remains roughly constant；the mechanical characteristics and failure modes are determined by the materials? composition and structure.
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2012, Vol. 31 
