Non-Linear Finite Element Modeling of RC Beams Sstrengthened Using Prestressed NSM CFRP Rods Subjected to Cyclic Loading

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Title: Non-Linear Finite Element Modeling of RC Beams Sstrengthened Using Prestressed NSM CFRP Rods Subjected to Cyclic Loading

Author(s): Fadi Oudah and Raafat El-Hacha

Publication: Special Publication

Volume: 301

Issue:

Appears on pages(s): 1-18

Keywords: bond, CFRP, damage, degradation, fatigue, Near-Surface Mounted, strengthening.

Date: 3/16/2015

Abstract:
Finite Element Method (FEM) models of Reinforced Concrete (RC) beams strengthened in flexure using prestressed Near-Surface Mounted (NSM) Carbon Fiber Reinforced Polymer (CFRP) subjected to quasi-static loading were developed and presented in this paper. One un-strengthened RC beam and four RC beams strengthened using NSM CFRP prestressed to various prestress levels were modeled. Comparisons of the load-deflection behaviors between the FEM models and the experimental test results indicate the good agreement in the loading branch. However, differences in the stiffness exist once the beams are unloaded. It seems that the concrete damage variables in tension and in compression play a paramount role in the response of the beams under cyclic loading. The possible modifications to the developed FE model are outlined as well as the future needed research.