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Steel and Composite Structures
  Volume 16, Number 6, June 2014 , pages 559-576

Non-linear analysis of side-plated RC beams considering longitudinal and transversal interlayer slips
Jerneja Kolšek, Tomaž Hozjan, Aleš Kroflič, Miran Saje and Igor Planinc

    A new mathematical model and its finite element formulation for the non-linear stress-strain analysis of a planar beam strengthened with plates bolted or adhesively bonded to its lateral sides is presented. The connection between the layers is considered to be flexible in both the longitudinal and the transversal direction. The following assumptions are also adopted in the model: for each layer (i.e., the beam and the side plates) the geometrically linear and materially non-linear Bernoulli\'s beam theory is assumed, all of the layers are made of different homogeneous non-linear materials, the debonding of the beam from the side-plates due to, for example, a local buckling of the side plate, is prevented. The suitability of the theory is verified by the comparison of the present numerical results with experimental and numerical results from literature. The mechanical response arising from the theoretical model and its numerical formulation has been found realistic and the numerical model has been proven to be reliable and computationally effective. Finally, the present formulation is employed in the analysis of the effects of two different realizations of strengthening of a characteristic simply supported flexural beam (plates on the sides of the beam versus the tension-face plates). The analysis reveals that side plates efficiently enhance the bearing capacity of the flexural beam and can, in some cases, outperform the tensile-face plates in a lower loss of ductility, especially, if the connection between the beam and the side plates is sufficiently stiff.
Key Words
    externally plated beam; side-plated beam; tension-face plated beam; longitudinal and transverse slips; Reissner beam; reinforced concrete beam; numerical model
(1)Tomaž Hozjan, Aleš Kroflič, Miran Saje, Igor Planinc
University of Ljubljana, Faculty of Civil and Geodetic Engineering, Jamova 2, SI-1115 Ljubljana, Slovenia;
(2) Jerneja Kolšek:
ZAG - Slovenian National Building and Civil Engineering Institute, Dimičeva 12, SI-1000 Ljubljana, Slovenia.

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