Creep Analysis of Axially Loaded Frp Concrete Columns | ||
| AL-MANSOUR JOURNAL | ||
| Article 1, Volume 0, Issue 26, October 2017, Pages 1-28 | ||
| Authors | ||
| Hani M. Fahmi; Ahmed Karim | ||
| Abstract | ||
| In this investigation, a three-dimensional finite element model has been used to analyze four concrete-filled fiber reinforced polymer (FRP) tubes and two fiber-wrapped concrete columns under sustained axial compressive load utilizing ANSYS software. Twenty-node viscoelastic element has been used to model the concrete, while the FRP tube is modeled using twenty-node isoparametric solid element and fiber-wrap is modeled using eight-node isoparametric shell element, both connected by eight-node isoparametric interface element. Also, the effects of some important parameters including concrete compressive strength, tube wall thickness, number of fiber-wraps, column diameter, ultimate creep coefficient, and type of FRP on the creep behavior of these columns have been investigated. Comparison between the numerical and available experimental long-term results showed good agreement with a maximum difference of the total strain values of 5.5%, which confirms the accuracy and validity of the models and materials constitutive relations and method used. The numerical results also showed that a stress transfer in the concrete-filled FRP column occurred with time between the FRP tube and the concrete, leading to a 22% stress reduction in the concrete and a stress increase in the FRP of 25% after 200 days of loading. | ||
| Keywords | ||
| Concrete; Creep; columns; Fiber reinforced polymer; finite element analysis; Time Effects | ||
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