Beam Shear — ACI 318-25 Shear Design

1 · Input data

One-way shear (stirrup) design check of a rectangular, nonprestressed, cast-in-place beam to ACI CODE-318-25 (procedure ENG-2026-10-027): the section and its effective depth, the materials, the factored shear and the uniform load, the critical section of 9.4.3.2, the axial force, the full longitudinal steel A_s from the flexural design, the exposure, the bars, the number of stirrup legs and the spacing. The page computes the concrete contribution V_c from the revised Table 22.5.5.1 — including the size effect row (c) that applies whenever the provided A_v is below A_v,min — decides whether shear reinforcement is required, sizes the stirrups, and checks the spacing, the cross-section limit of 22.5.1.2 and the detailing. Every parameter below is required. Press Solve the beam shear check when the card is complete — if anything is missing or malformed the page opens a pop-up naming each parameter and computes nothing; an input that is well-formed but outside the procedure is refused with the clause that refuses it.

Section and materials

b_w — web width of the section (in)

h — overall depth of the section (in)

d — effective depth to the tension reinforcement (in)

f′_c — specified compressive strength of concrete (psi)

f_y — yield strength of the longitudinal reinforcement (psi)

f_yt — yield strength of the stirrups (psi, at most 60000)

Demand

V_u — factored shear at the face of support (lb)

w_u — factored uniform load on the member (lb/ft, 0 if none)

The critical section the check is made at (9.4.3.2)

N_u — factored axial force (lb, + compression, − tension, 0 if none)

Longitudinal steel and exposure

A_s — the full longitudinal tension reinforcement (in²)

Concrete exposure (Table 20.5.1.3.1)

Stirrups

The smallest longitudinal bar the stirrup encloses (9.7.6.4.2, 9.7.7.1(c))

Stirrup bar size (25.7.1.3 covers No. 3, No. 4 and No. 5)

Number of stirrup legs within the spacing (2 or more)

Stirrup spacing provided, along the member (in)

Concrete and applicability

d_agg — nominal maximum aggregate size (in)

λ — concrete type (19.2.4)

Beam type for the Table 9.6.3.1 exception to 9.6.3.1

Is this a beam along the perimeter of the structure? (9.7.7.1)

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2 · Solution

No solution yet — complete every input in the card above and press Solve the beam shear check. This card stays empty until a solution is computed, and it is emptied again the moment any input changes, so a displayed solution always belongs to the inputs on screen.