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干湿交替与荷载作用下CFRP加固混凝土梁的耐久性

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Indexed by:期刊论文

Date of Publication:2022-06-30

Journal:Journal of Southeast University

Issue:3

Page Number:376-380

ISSN No.:1003-7985

Abstract:The test results of eight concrete beams reinforced with carbon fiber reinforced polymer (CFRP) sheets subjected to an aggressive environment under a sustained load are presented.The beams are 1 700 mm long with a rectangular cross-section of 120-mm width and 200-mm depth.The beams are precracked with a four-point flexural load, bonded CFRP sheets, and placed into wet-dry saline water(NaCl) either in an unstressed state or loaded to about 30% or 60% of the initial ultimate load.The individual and coupled effects of wet-dry saline water and sustained bending stresses on the long term behaviour of concrete beams reinforced with the CFRP are investigated.The test results show that the coupled action of wet-dry saline water and sustained bending stresses appears to significantly affect the load capacity and the failure mode of beam strengthened with CFRP, mainly due to the degradation of the bond between CFRP and concrete.However, the stiffness is not affected by the coupled action of wet-dry cycles and a sustained load.

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