Strip (Wall) Footing Design
Strength design (LRFD) of a concentrically-loaded continuous strip footing under a bearing wall per ACI 318-19, analyzed on a 1-ft length. Checks service bearing against the geotechnical allowable, then designs the transverse bottom reinforcement for flexure at the wall face, verifies one-way shear at d from the wall face, and confirms minimum steel and bottom-bar development for the factored net soil pressure. Fully customizable.
What this calculates
Service gross bearing pressure vs. the allowable (q/qa), factored wall load and net soil pressure (qu = Pu/B), flexural cantilever from the wall face, factored moment and required transverse reinforcement (As), one-way shear demand at d from the wall face vs. design capacity (φVc = φ·2·λ·√f'c·b·d), minimum reinforcement, and development-length adequacy.
Inputs
Service dead load per foot of wall
Service live load per foot of wall
Footing width transverse to the wall
Overall footing depth
Supported wall thickness (sets the cantilever)
Net allowable service-level soil bearing (geotechnical report)
Clear cover, cast against earth (ACI 20.5.1.3)
Specified compressive strength of concrete
Reinforcement yield strength (ASTM A615 Gr. 60)
Bottom transverse bar size and spacing
Outputs
Service bearing demand-to-allowable ratio — must be ≤ 1.0
Factored net soil pressure for member design
Required transverse bottom reinforcement per foot
Flexural demand-to-capacity ratio — must be ≤ 1.0
One-way shear demand-to-capacity ratio — must be ≤ 1.0
Methodology
Per ACI 318-19 strength design, on a 1-ft length. Service bearing q = (D + L)/B + γc·h is checked against the geotechnical allowable qa (a service-level input from the geotech report). Member design uses the factored net pressure qu = Pu/B from 1.2D + 1.6L per ASCE 7-22 Section 2.3.1 / ACI 318-19 Section 5.3.1. Flexure at the wall face per Section 22.2 over the cantilever lc = (B − wall)/2. One-way shear at d from the wall face per Section 22.5.5.1. Minimum steel per Sections 7.6.1.1 / 24.4.3.2 and bottom-bar development per Section 25.4.2. Excludes combined (two-column) footings, overturning/eccentricity, and punching shear.
Code References
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