The thesis paper describes the procedure of designing reinforced concrete sections. Cross section
resistance depends on the number of reinforced bars, section dimensions and concrete strength.
Usually we choose the type of concrete, the geometry of the section and then determine the number of
reinforced bars. This is the fastest way of designing, but not the cheapest. In order to look for the most
economical solution, it is necessary to calculate all the parameters for all types of concretes. This way
is more complicated and requires more time. Part of my graduation thesis is in Excel, which has an
integrated solver application. With this add-in we can find the best solution with less difficulty. Users
enter the types of concrete and their prices, limit values of the geometry parameters and loads. Using
nonlinear functions to solve equations, solver gives results for every type of concrete, and the number
of reinforced bars and section dimensions.
The static model is a simply supported beam. It is possible to modify the program for different types
of constructions. The beam is loaded with an axial force and bending moment. The assumption is: the
bending moment is significantly larger than the axial force. This state of stress causes large
eccentricity. The computer program calculates only longitudinal reinforcement, but not the shear
reinforcement. The design procedure is explained in the standard Eurocode 2. It is required to check
the ultimate and serviceability limit state. Based on the obtained results, the conclusion is that for
construction loaded with a large bending moment and a small axial force, the most economical
concrete is between C40 and C50.
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