Beam Reinforcement Detailing per ACI 318-19 with ideCAD
How does ideCAD control beam reinforcement detailing according to ACI 318-19?
Reinforcement detailing is applied automatically in accordance with ACI 9.7.
Covers of reinforced concrete elements are defined by user.
Download ideCAD for ACI 318-19
Notation
db = Nominal diameter of bar, wire, or prestressing strand, in.
fc' = specified compressive strength of concrete, psi
√fc‘ = square root of specified compressive strength of concrete, psi
fy = specified yield strength of nonprestressed reinforcement, psi
Ktr = transverse reinforcement index, in.
ld = development length in tension of deformed bar, deformed wire, plain and deformed welded wire reinforcement, or pretensioned strand, in.
s = center-to-center spacing of items, such as longitudinal reinforcement, transverse reinforcement, tendons, or anchors, in.
ψe = factor used to modify development length based on reinforcement coating
ψg = factor used to modify development length based on grade of reinforcement
ψs = factor used to modify development length based on reinforcement size
ψt = factor used to modify development length for casting location in tension
λ = modification factor to reflect the reduced mechanical properties of lightweight concrete relative to normalweight concrete of the same compressive strength
Concrete cover for reinforcement should be in accordance with ACI Table 20.5.1.3.1. The concrete cover is measured to the outer edge of ties, stirrups, or spirals if transverse reinforcement encloses the main bars.
Concrete exposure | Member | Reinforcement | Specified cover, in. |
|---|---|---|---|
Cast against and permanently in contact with ground | All | All | 3 |
Exposed to weather or in contact with ground | All | #6 through #18 bars | 2 |
#5 bar and smaller | 1-1/2 | ||
Not exposed to weather or in contact with ground | Slabs, joints, and walls | #14 and #18 bars | 1-1/2 |
#11 bar and smaller | 3/4 | ||
Beams, colums, pedestals | Primary reinforcement, stirrups, ties, spirals and hoops | 1-1/2 |
Cover or specified concrete is defined as the distance between the outermost surface of embedded reinforcement and the closest outer surface of the concrete.
Development lengths of concrete beam reinforcement should be in accordance with Development of Reinforcement per ACI 318-19 with ideCAD title. In this case, for deformed bars or deformed wires, ld is calculated in accordance with ACI Table 25.4.2.3. Other conditions are described in the same title.
Splices of deformed reinforcement should be in accordance with Splices per ACI 318-19 with ideCAD title.
Transverse reinforcement is provided such that Ktr, along with development and splice lengths of longitudinal bars with fy ≥ 80,000 psi. The minimum value of Ktr is 0.5db. (Development of Reinforcement per ACI 318-19 with ideCAD)
Minimum reinforcement spacing s is determined according to Minimum Spacing of Reinforcement per ACI 318-19 with ideCAD title.
