Techno Press

Steel and Composite Structures   Volume 17, Number 5, November 2014, pages 601-621
Effect of tapered-end shape of FRP sheets on stress concentration in strengthened beams under thermal load
Benaoumeur El Mahi, Kouider Halim Benrahou, Sofiane Amziane, Khalil Belakhdar, Abdelouahed Tounsi and El Abbes Adda Bedia

Abstract     [Full Text]
    Repairing and strengthening structural members by bonding composite materials have received a considerable attention in recent years. The major problem when using bonded FRP or steel plates to strengthen existing structures is the high interfacial stresses that may be built up near the plate ends which lead to premature failure of the structure. As a result, many researchers have developed several analytical methods to predict the interface performance of bonded repairs under various types of loading. In this paper, a numerical solution using finite . difference method (FDM) is used to calculate the interfacial stress distribution in beams strengthened with FRP plate having a tapered ends under thermal loading. Different thinning profiles are investigated since the later can significantly reduce the stress concentration. In the present theoretical analysis, the adherend shear deformations are taken into account by assuming a parabolic shear stress through the thickness of both beam and bonded plate. The shear correction factor for I-section beams is also included in the solution. Numerical results from the present analysis are presented to demonstrate the advantages of use the tapers in design of strengthened beams.
Key Words
    plate bonding; FRP composite; interfacial stresses; repaired beam; taper
(1) Benaoumeur El Mahi, Kouider Halim Benrahou, Khalil Belakhdar, Abdelouahed Tounsi, El Abbes Adda Bedia:
Material and Hydrology Laboratory, University of Sidi Bel Abbes, Faculty of Technology, Civil Engineering Department, Algeria;
(2) Sofiane Amziane:
Clermont University, Institut Pascal, Polytech'Clermont-Ferrand, 63174 Aubière Cedex, France.

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