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Notation
Ec = modulus of elasticity of concrete, psi
Es = modulus of elasticity of reinforcement, psi
fc'= specified compressive strength of concrete, psi
fy = specified yield strength for non-prestressed reinforcement, psi
εt = net tensile strain in the extreme layer of longitudinal tension reinforcement at nominal strength, excluding strains due to effective prestress, creep, shrinkage, and temperature
εty = value of net tensile strain in the extreme layer of longitudinal tension reinforcement used to define a compression-controlled section
ϕ = strength reduction factor
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It is stated in ACI 21.2.4.4 that the value of ϕ for shear will be 0.85 for beam-column joints and diagonally reinforced coupling beams.
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Download ideCAD for ACI 318-19 |