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This thesis aims at the analysis of concrete beam strength-
ened by bonded plate which is gradually attached importance
whole nowadays. In order to comprehend more about the behavior
of the structures under complex loading states, this research
will build up an elastoplastic-numerical model of concrete
according to continuum damage model suggested by Lemaitre on
account of the hypothesis that damage of concrete to be
isotropic by thinking of crack clousure effect under
compression, and making use of irreversible thermodynamic
theory along with H-T-C plasticity criterion. With the analysis
of material elements, we will try to regard the reinforcing
bars inside the element as the well-mixed material by way of
the synthesis of stiffness, and develope the constitutive
relationship of the reinforcing concrete material, so as to
simulate the behaviors of it. In this research, under the plane
stress condition, the developed numerical model for RC material
will be used to analyze and simulate the stress-strain
relationship of 12 plates born under pure shear stress and
confining stress by a selected damage parameter S. And then,
the numerical results are compared with the experiment data to
prove the feasibility of the model. Finally, this research goes
to a step further to proceed the loading numerical analysis of
the beam strengthened by bonded plate which are popular at
present, comparing with the original experiment data. And then,
the distribution of traction along the interface between the
bonded plate and the original beam matrix will be analyzed.
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