CE Calculators > Strength of doubly Reinforced Concrete beam > Rectangular section with two layers of tension rebar

Calculator for Strength of doubly Reinforced Concrete beam with two layers of tension rebar (FPS/US Customary Units)


Reinforced concrete beam

This calculator is useful for doubly reinforced rectangular concrete beam with two layers of tension re-bar. There should be equal number of rebar in each layer. This calculator uses FPS/US Customary Units. You can also use it for singly reinforced section, just by entering compression rebar equal to zero.

Effective depth is measured from the top edge to the centroid of tension rebar. This calculator uses the concept of Whitney's stress block and measures the depth of stress block "a" from the top edge. The user of this calculator is advised to comply with ACI guidelines for beam thickness, rebar spacing and cover etc.

This calculator also determines the minimum area of tension rebar required for crack control and balanced steel area required for a balanced section in addition to the area of tension steel available in the section.

This calculator assumes a strirrp of #3 and maximum rebar of #11. It also calculates minimum beam width required. This calculator also calculates the strain in tension steel and compression steel to ascertain yielding of steel. There should be atleast 2 rebars and atmost 6 rebars in a single layer.

Please enter the values in the appropriate units mentioned in the form given below and start calculations.

INPUT VALUES
Width of beam (in.):
Effective Depth of beam (in.):
Compr. Strength of Conc. f '_c (ksi):
Yield stress of Tension Steel f_y (ksi):
No. of Rebar in Tension (nos.):
Dia of Rebar in Tension (in.):
Distance between rebar layers (in.):
Yield stress of Comp. Steel f '_y (ksi):
No. of Rebar in Compr. (nos.):
Dia. of Rebar in Compr. (in.):
Cover of Compr. steel (in.):
Please make sure that all
the values are entered

OUTPUT RESULTS
Min. Beam Width required (in.)=
Min. Area of tension steel (sq in.)=
Balanced Steel area (sq in.)=
Area of Tension rebar (sq in.)=
force of Tension rebar (kip)=
Beta 1(Whitney's coefficient)=
'a' (depth of stress block) - (in.)=
'X' (depth of neutral axis) - (in.)=
Area of Compr. rebar (sq in.)=
Force of Compr. in rebar:Cs (kip)=
Force of compr. Conc.:Cc (kip)=
Total Force of Compr.:Cc+Cs (kip)=
Nominal Moment, Mn (ft-kip)=
Yield strain of steel =
Strain in compr. steel =
Strain in bottom layer of rebar =
Strain in second layer of rebar =

Other Calculators for Strength of
Reinforced concrete beam

Reinforced Concrete beam with
One layer 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

You can also visit the following solved
example on reinforced concrete

reinforced concrete Strength of doubly reinforced
concrete beam when compression
steel is not yielding

doubly reinforced concrete
Nominal Flexural Strength of
Doubly Reinforced Concrete beam

reinforced concrete
Nominal Moment Strength of
Singly Reinforced Concrete beam


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