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Date of Publication:2010-01-01

Journal:工程力学

Affiliation of Author(s):建设工程学部

Volume:27

Issue:4

Page Number:202-207

ISSN No.:1000-4750

Abstract:Carbon Fiber-Reinforced Polymer(CFRP)material is increasingly being used
   for the retrofit and repair of concrete structures. However, there is
   insufficient information on the environmental durability of CFRP,
   especially under aggravating environmental conditionings combined with
   sustained loads. The coupled effects of freeze-thaw cycle and sustained
   loads on the long term behaviour of CFRP were investigated. The CFRP
   specimens are subjected to freeze-thaw cycle in an unstressed state or
   loaded in about 30%or 60%of the initial ultimate load, and there
   involve, respectively,50,100,200 and 300 times of freeze-thaw cycles in
   water solution. The ultimate strength, elongation and elastic modulus of
   CFRP are studied after coupled actions of freeze-thaw cycle and
   sustained loads. The test results indicate that the coupled action of a
   freeze-thaw cycle and a sustained load had an effect on ultimate
   strength and elongation of specimen, while did not have any significant
   effect on elastic modulus of specimen.A simple residual strength damage
   model of CFRP under a freeze-thaw cycle and a sustained load is
   presented.

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