Page Comparison

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Notation

A_g = gross area of concrete section, in²
A_s= area of nonprestressed longitudinal tension reinforcement, in²
E_c = modulus of elasticity of concrete, psi
E_s = modulus of elasticity of reinforcement, psi
f_c^' ₌ specified compressive strength of concrete, psi
f_y = specified yield strength for nonprestressed reinforcement, psi
M_u= factored moment at section, in.-lb
β ₌ ratio of long to short dimentions; clear spans for two-way slabs, sides of column, concentrated load or reaction area; or sides of a footing
γ_s = factor used to determine the portion of reinforcement located in center band of footing

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According to ACI 13.3.1.3, in sloped, stepped, or tapered foundations, the depth, and location of steps or slope angle should be such that design requirements are satisfied at every section.

One-way Shallow Foundations

According to ACI 13.3.1.4, one-way shallow foundations, including strip footings, combined footings, and grade beams, should be designed in accordance with the applicable provisions of ACI Chapter 7 (One-Way Slab Design per ACI 318-19 §7) and ACI Chapter 9 (Reinforced Concrete Beam Design per ACI 318-19 per ACI 318-19 §9, §18).

According to ACI 13.3.1.5, reinforcement should be distributed uniformly across the entire width of a one-way footing.

Two-way Isolated Foundations

According to ACI 13.3.3.1, two-way shallow foundations should be designed in accordance with the applicable provisions of ACI Chapter 7 (One-Way Slab Design per ACI 318-19 §7) and ACI Chapter 8 (Two-Way Slab Design per ACI 318-19 §8).

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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 applicable provisions of ACI Chapter 8 (Two-Way Slab Design per ACI 318-19 §8).

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• ρ_l should be at least the greater of the value calculated by ACI Eq. (11.6.2) and 0.0025
  

  Mathinline
  host Confluence:2933017122 body $$ \normalsize \rho_l \geq 0.0025 + 0.5(2.5-h_w/l_w)( \rho_l-0.0025) \; \; \; \; \; \; \; \; \; \; \; \; \; \; \; \; \; \; \; \; \; \; (11.6.2) $$

• The minimum value of ρ_t should be 0.0025

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