القائمة الرئيسية

الصفحات

Reinforced 

Concrete Design


a = depth of the effective compression block in a concrete beam

A = name for area Ag = gross area, equal to the total area ignoring any reinforcement 

As = area of steel reinforcement in concrete beam design

As' = area of steel compression reinforcement in concrete beam design 

Ast = area of steel reinforcement in concrete column design 

Av = area of concrete shear stirrup reinforcement 

ACI = American Concrete Institute 

b = width, often cross-sectional 

bE = effective width of the flange of a concrete T beam cross section 

bf = width of the flange 

bw = width of the stem (web) of a concrete T beam cross section 

c = distance from the top to the neutral axis of a concrete beam (see x) 

cc = shorthand for clear cover 

C = name for centroid = name for a compression force 

Cc = compressive force in the compression steel in a doubly reinforced concrete beam 

Cs = compressive force in the concrete of a doubly reinforced concrete beam 

d = effective depth from the top of a reinforced concrete beam to the centroid of the tensile steel 

d´ = effective depth from the top of a reinforced concrete beam to the centroid of the compression steel 

db = bar diameter of a reinforcing bar 

D = shorthand for dead load 

DL = shorthand for dead load 

E = modulus of elasticity or Young’s modulus = shorthand for earthquake load 

Ec = modulus of elasticity of  concrete 

Es = modulus of elasticity of steel 

n = modulus of elasticity transformation coefficient for steel to concrete 

n.a. = shorthand for neutral axis (N.A.) 

pH = chemical alkalinity P = name for load or axial force vector 

Po = maximum axial force with no concurrent bending moment in a reinforced concrete column 

Pn = nominal column load capacity in concrete design 

Pu = factored column load calculated from load factors in concrete design 

R = shorthand for rain or ice load = radius of curvature in beam deflection relationships (see ρ ) 

Rn = concrete beam design ratio = Mu/bd2 

s = spacing of stirrups in reinforced concrete beams 

S = shorthand for snow load t = name for thickness 

T = name for a tension force = shorthand for thermal load 

U = factored design value Vc = shear force capacity in concrete

Vs = shear force capacity in steel shear stirrups 

Vu = shear at a distance of d away from the face of support for reinforced concrete beam design 

wc = unit weight of concrete 

wDL = load per unit length on a beam from dead load 

Reinforced Concrete Design 

Structural design standards for reinforced concrete are established by the Building Code and Commentary (ACI 318-14) published by the American Concrete Institute International, and uses strength design (also known as limit state design).  

f’c = concrete compressive design strength at 28 days (units of psi when used in equations)


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