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CE Calculators >> Reinforced Concrete Beam >>

                Calculator for Strength of Reinforced Concrete beam


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.

  • doubly reinforced concrete beam

  • 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 top-edge 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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Select the Section of RC beam to start Calculator
Reinforced  Concrete beam with One layer of Tension Rebar
(FPS/US Customary Units)
doubly reinforced beam with one layer of tension rebar
Reinforced Concrete beam with Two layers of Tension Rebar
(FPS/US Customary Units)
doubly reinforced beam with two layers of tension rebar
Reinforced Concrete beam with One layer of Tension Rebar
(SI/Metric Units)
doubly reinforced concrete beam with one layer of tension rebar
Reinforced Concrete beam with Two layers of Tension Rebar
(SI/Metric Units)
doubly reinforced concrete beam two layers of tension rebar



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Last updated on Tuesday February 18, 2014