DESIGN OF SINGLY REINFORCED CONCRETE BEAM SECTION (beta version)

RHC ENGINEERING

DESIGN OF SINGLY REINFORCED CONCRETE BEAM SECTION

Tension-Controlled Section

Sections are tension-controlled when the net tensile strain in the extreme tension steel is equal to or greater than 0.005 just as the concrete in compression reaches its assumed strain limit of 0.003.

Material Properties:

fc = MPa

fy = MPa

es = Reinf. modulus of elasticity

f =

Section Properties:

B = mm

H = mm

dc = mm

Applied Moment:

Mua = kNm

Select Bar Diameter:

Db = 8 10 12 14 16 20 25 28 32 mm, Diameter of bars

Singly Reinforced Section properties:

ec = Concrete compressive strain

es = Reinf. tensile strain

dt = Effective depth

dt = h - d_c

ct = Neutral axis depth

beta = Equivalent depth factor

Ymax = Equivalent compressive block depth

As = Maximum area of steel for singly reinforced section

Mur = Maximum resistance moment for singly reinforced section

Section works as a because of:

The applied moment Mua = is than the maximum resistance moment for the section Mur = .

Calculate Required Area of Steel:

Y = Equivalent compressive block depth

As(req) = Required area of steel

Asmax = Maximum area of steel for the beam section

Asmin1 = Minimum area of steel for the beam section

Asmin1 = 0.25 * [sqrt(fc)/fy] * b * dt

Asmin2 = Another minimum area of steel

Asmin3 = Another minimum area of steel

As(used) = Used area of steel

Calculate Quantity of Bars:

Nb = Number of bars

Nb = roundup(As(used) / (0.25 * p * (Db)^2), 0)