
This section provides a calculator in
(SI/Metric system of units) to estimate the strength of rectangular
section of a
reinforced concrete beam (singly or doubly reinforced).
ACI
(American Concrete Institute) guidelines are adopted in developing this
Calculator:

Ultimate compressive strain in
concrete is equal to 0.003.

Tensile strength of concrete is
ignored.

Strain varies linearly over the
depth of the cross section.

Steel stress varies linearly
until yielding and remains constant beyond yielding.

Compressive force in the
concrete is determined from Whitney's equivalent stress block.
The following figure
explains how different values have to be selected for the
calculator.
The effective depth "d" is determined from the centroid of
tension reinforcement upto the topedge of beam. If there are two layers of
tension rebar, separate
them with a clear distance and other criteria as per ACI 31808. The user of
this calculator is advised to comply with
ACI guidelines
for beam thickness,
rebar spacing and cover etc.The following calculator will be helpful
in determining the nominal bending moment strength of rectangular Reinforced Concrete beam.
It will also calculate the strain in the layers of rebar which helps to know
whether steel has yielded or not.

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