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According to ACI 13.3.1.4; one way shallow foundations including strip fooings, combined footings and grade beams should be designed in accordance with the appliacable provisions of ACI Chapter 7 (One-Way Slab Design) and ACI Chapter 9 (Reinforced Concrete Beam Design per ACI 318-19).
According to ACI 13.3.1.5; reinforcement should be distributed uniformly across entire width of one-way footing.
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According to ACI 13.3.3.1; two-way shallow foundations should be designed in accordance with the appliacable provisions of ACI Chapter 7 (One-Way Slab Design) and ACI Chapter 8 (Two-Way Slab Design).
According to ACI 13.3.3.2; reinforcement should be distributed uniformly across entire width of two-way footing in both directions.
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Reinforcement in the long direction should be distributed uniformly across entire width of footing.
Reinforcement in the short direction, a portion of the total reinforcement, γsAs, should be distributed uniformly over a band with equal to the length of short side of footing, centered on centerline of column or pedestal. Remainder of reinforcement required in the short direction, (1-γs)As, shall be distributed uniformly outside the center band width of footing, where γs is calculated by ACI Eq. (13.3.3.3),
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Two-way Combined Footings and Mat Foundations
According to ACI 13.3.4.1; two-way shallow foundations should be designed in accordance with the appliacable provisions ACI Chapter 8 (Two-Way Slab Design).
According to ACI 13.3.4.3; Distribution of bearing pressure under combined footings and mat foundations should be consistent with properties of the soil or rock and the structure, and with established principles of soil or rock mechanics.
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According to ACI 13.3.5.1; walls as grade beams should be designed in accordance with the appliacable provisions of ACI Chapter 9 (Reinforced Concrete Beam Design per ACI 318-19).
According to ACI 13.3.5.3; walls as grade beams should satisfy the minimum reinforcement requirement of ACI 11.6.
According to ACI 11.6.1, If in-plane Vu ≤ 0.5ϕαcλ√fc‘Acv, minimum ρl and ρt should be in accordance with ACI Table 11.6.1.
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ρl should be at least the greater of the value calculated by ACI Eq. (11.6.2) and 0.0025
Minimum value of ρt should be 0.0025
Critical sections for shallow foundations and pile caps
According to ACI 13.2.7.1, Mu at the supported member can be calculated at the critical section defined in accordance with ACI Table 13.2.7.1.
Development of reinforcement in shallow foundations
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Mathinline host Confluence:2933017122 body $$ \normalsize \rho_l \geq 0.0025 + 0.5(2.5-h_w/l_w)( \rho_l-0.0025) \; \; \; \; \; \; \; \; \; \; \; \; \; \; \; \; \; \; \; \; \; \; (11.6.2) $$ Minimum value of ρt should be 0.0025
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