کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
778326 1463788 2012 13 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Fatigue strengthening of damaged metallic beams using prestressed unbonded and bonded CFRP plates
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی مکانیک
پیش نمایش صفحه اول مقاله
Fatigue strengthening of damaged metallic beams using prestressed unbonded and bonded CFRP plates
چکیده انگلیسی

Bonded fiber reinforced polymers (FRPs) reinforcement systems have traditionally been found to be an efficient method for improving the lifespan of fatigued metallic structures and have attracted much research attention. Nevertheless, the performance of a bonded FRP reinforcement system under fatigue loading is basically dependent on the FRP-to-metal bond behavior. In this paper, a prestressed unbonded reinforcement (PUR) system was developed. The proposed PUR system can be used as an alternative to bonded FRP reinforcement, particularly when there is concern about the effects of high ambient temperatures, moisture, water and fatigue loading on the FRP-to-metal bond behavior. The performance of cracked beams strengthened by the PUR system was compared with that of cracked beams strengthened by the prestressed bonded reinforcement (PBR) system. A theoretical method was developed to estimate the level of prestressing sufficient to arrest fatigue crack growth (FCG). Furthermore, the method was used to examine different passive, semi-active and active crack modes with a loaded, strengthened beam. The mechanism by which a prestressed FRP plate forms a compressive stress field at the vicinity of the crack tip was also examined. Finite element (FE) modeling was conducted and the results were compared with experimental results.


► A prestressed unbounded reinforcement (PUR) system was developed.
► The performance of cracked beams strengthened by the PUR system was examined.
► A theoretical method was developed to estimate the crack arrest prestressing level.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Fatigue - Volume 44, November 2012, Pages 303–315
نویسندگان
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