
This section provides a calculator to estimate the strength of rectangular
section of a
reinforced concrete beam (singly or doubly reinforced).
It also checks for minimum steel for crack control as well as steel
for balanced section.
You can use this
calculator for either
FPS/US Customary units or
SI/Metric
units.
The following assumptions as per ACI
(American Concrete Institute) are adopted in developing the
Calculator for the strength of RC beam:

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 above 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 318. The user of
this calculator is advised to comply with
ACI guidelines
for beam
thickness, rebar spacing and cover etc.This 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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