The thesis presents a computer program for the design of a double-reinforced concrete section to
axial-
bending and shear strength in ultimate limit states. The program is developed in Visual C#®
programming language by the author of this thesis. When defining the maximum axial-bending
resistance of RC section the following factors are taken into consideration: the assumption of
straight cross-sections and the compatibility of contact deformation of the reinforcement with the
surrounding concrete. However, the tensile load of concrete in the account is ignored.
Interdependency between stress and strain in concrete is considered according to the stress-strain
diagram of concrete cylinder test, given by a parabola and a straight line. The interdependency
between the stress and the reinforcement deformation is considered according to an idealized
antisymmetric bilinear diagram for reinforcement steel. In the analysis of axial and bending
resistance of the concrete cross-section the latter is divided into subsections and panels. The
program allows the calculation of the minimum quantity and symmetrical quantity of longitudinal
reinforcement. In determining the shear resistance of RC cross-section the following factors are
considered: the shear bearing capacity of the non-cracked concrete section, the friction between
the grains of the aggregate along the shear cracks, and the dowel effect of longitudinal tensile
reinforcement in the shear crack. If the contributions mentioned are not sufficient to bear shear
load, shear resistance sectional proof is performed based on the model of planar truss consisting
of tensile zone, compressive tie in concrete, and shear reinforcement. Adequacy and applicability
of the developed computer program is illustrated in three different computational cases.
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