This paper presents experimental and theoretical research for calculating of composite steel and concrete beams deflection strengthened bonded steel plates. The use of epoxy-bonded plates to strengthen existing or damaged reinforced or composite steel beams concrete beams has been extensively researched. It has been proven to be a useful and reliable method of increasing the ultimate flexural capacity of both damaged and undamaged members. The actual deflection behavior in beams is probabilistic in nature and requires statistical methods for a rational analysis.
Investigations of the normal sections strength of compressed elements using a deformation method were performed. The shape of the section, the class of concrete and the percentage of reinforcement were taken into account when performing analytical calculations. Analytical, numerical, optimization techniques etc. were used for solving of this task. The results of the analytical calculations and the data of the experimental studies were compared.
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