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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Analytical Modeling of Concrete-Filled FRP
Circular Tubes under Reversed Cyclic Bending
Author(s): K. Helmi, A. Fam, and A. Mufti
Publication: Special Publication
Appears on pages(s): 71-90
Keywords: bending; concrete-filled tube; cyclic; fatigue life; FRP tubes; model
Abstract:This paper presents an analytical procedure for modeling concrete-filled fiber-reinforced polymer (FRP) tubes (CFFTs) subjected to reversed cyclic bending, including a method for predicting their fatigue life. The model employs procedures to account for creep and stiffness degradation of FRP and concrete. The predicted behavior compared reasonably well with experimental results of three large-scale CFFT specimens tested under reversed high-cycle fatigue. It was shown that excessive slip between the concrete core and FRP tube reduces fatigue life and, hence, the accuracy of prediction was better at lower moments as slip was less. A parametric study conducted showed that
time-dependant properties of concrete and FRP affect the long-term deflection of CFFTs subjected to reversed cyclic bending. Increasing the loading frequency, for the same number of cycles, decreases the deterioration in the response in terms of excessive deflection. Finally, CFFT members with a larger
diameter-to-thickness (D/t) ratio (that is, smaller FRP reinforcement ratio) suffer a slightly larger deterioration in their cyclic response than CFFTs with smaller D/t ratio.
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