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发布时间：2019-03-11

论文类型：期刊论文

发表时间：2012-01-01

发表刊物：5th International Conference on Fiber-Reinforced Polymer (FRP) Composites in Civil Engineering (CICE)

收录刊物：CPCI-S、EI、SCIE

卷号：12

期号：1,SI

页面范围：95-108

ISSN号：0219-4554

关键字：Concrete; fiber-reinforced polymer; confinement, durability; monitoring

摘要：This paper presents an experimental investigation of the performances of concrete-filled glass fiber-reinforced polymer (GFRP) and GFRP externally wound steel circular tubes, subjected to freeze-thaw cycles ranging from -18 degrees C to 18 degrees C. The variation in hoop strains of the tubes during the freeze-thaw cycles was monitored by embedded fiber Bragg Grating (FBG) strain sensors in GFRP layers or between GFRP and steel tube. The residual hoop strain after each freeze-thaw cycle indicates the possible degradation of GFRP materials, such as cracks, debonding of GFRP-concrete or GFRP-steel due to mismatch of the coefficient of thermal expansion, as well as water immersion. A synergistic effect of FRP and steel tubes on the confinement of inside concrete was revealed, resulting in well-improved ductility. After 56 freeze-thaw cycles, remarkable degradation were found in the axial strength, modulus, and strain for concrete-filled GFRP tubes. However, the GFRP-steel tube system showed a negligible reduction in the ultimate axial strain by the freeze-thaw cycles with less degradation in the axial strength and modulus.