ACI 318-19 Clause Reference Index
Every ACI 318-19 section referenced by calcnote's methodology pages, mapped to the page where it is explained with worked examples. Use this index when you know the clause number and want the calcnote walkthrough. ASCE 7-22 and IBC references are listed at the bottom.
Chapter 5-6: General, Analysis, Slenderness
| Clause | Description | Methodology page(s) |
|---|---|---|
| §5.3 | Load combinations reference | Glossary: load combination |
| §5.3.1 | Factored load U | Glossary: factored load |
| §6.2.5 | Slenderness consideration limits | Column slenderness limits |
| §6.2.5.3 | Upper slenderness limit | Column slenderness limits |
| Table 6.3.2.1 | Effective flange width limits (T-beam) | T-beam effective flange width |
| §6.6.4 | Moment magnification procedure | Moment magnification factor, Biaxial column design |
| §6.6.4.4.4 | EI for stability analysis | Moment magnification factor |
| §6.6.4.5.3 | Non-sway magnification δns | Moment magnification factor |
| §6.6.4.5.4 | Minimum eccentricity in magnification | Minimum eccentricity for short columns |
Chapter 8-9: Beams
| Clause | Description | Methodology page(s) |
|---|---|---|
| §8.4.4.2 | Clear span for punching shear | Footing punching shear |
| Table 9.3.1.1 | Minimum beam thickness (deflection) | Beam deflection, Beam design example |
| §9.6.1.2 | Minimum flexural reinforcement As,min | Beam flexural design |
| §9.6.1.3 | 4/3 exception for As,min | Beam flexural design |
| §9.6.3.1 | Minimum shear reinforcement | Beam shear design |
| §9.7.6.2.2 | Maximum stirrup spacing halving | Beam shear design, Beam design example |
Chapter 10: Columns
| Clause | Description | Methodology page(s) |
|---|---|---|
| §10.6.1.1 | Longitudinal reinforcement limits (1% to 8%) | Column longitudinal reinforcement limits |
| §10.7.3.1 | Lateral reinforcement requirements | Column tie spacing, Spiral reinforcement |
Chapter 13: Footings
| Clause | Description | Methodology page(s) |
|---|---|---|
| §13.2.1 | Service-level bearing pressure | Footing bearing pressure, Footing design example |
| §13.2.6.2 | Critical section location | Footing one-way shear, Footing punching shear |
| §13.2.7.1 | Flexure critical section at column face | Footing flexure, Footing design example |
| §13.2.7.2 | Shear critical section at d | Footing one-way shear, Footing design example |
| §13.3.1.2 | Minimum footing depth (6 in) | Footing design example |
| §13.3.3.2 | Footing minimum reinforcement | Footing flexure, Footing design example |
| §13.3.3.3 | Footing reinforcement distribution | Footing flexure |
Chapter 16: Connections
| Clause | Description | Methodology page(s) |
|---|---|---|
| §16.3.4.1 | Minimum dowel area at interface | Footing design example |
Chapter 19: Material Properties
| Clause | Description | Methodology page(s) |
|---|---|---|
| §19.2.3.1 | Modulus of elasticity Ec | Beam deflection |
| Table 19.2.2.1 | λ for lightweight concrete | Beam deflection |
Chapter 20: Concrete Cover
| Clause | Description | Methodology page(s) |
|---|---|---|
| Table 20.2.2.4 | λ (lightweight factor) values | Beam shear design, φ factor transition |
| Table 20.6.1.3.1 | Concrete cover (cast against soil) | Footing design example, Beam design example, Wall footing design |
Chapter 21: Strength Reduction Factors
| Clause | Description | Methodology page(s) |
|---|---|---|
| Table 21.2.1 | Strength reduction factor φ (general) | Footing one-way shear, Footing punching shear |
| Table 21.2.2 | φ factor (flexure/axial) with transition zone | φ factor transition, Beam flexural design, Interaction diagram, Pn,max cap |
| §21.2.2.1 | φ interpolation in transition zone | φ factor transition |
Chapter 22: Sectional Strength
| Clause | Description | Methodology page(s) |
|---|---|---|
| §22.2 | Whitney rectangular stress block | Beam flexural design, Biaxial column design |
| Table 22.2.2.4.3 | β1 values | Beam flexural design, Beam design example |
| Table 22.4.2.1 | Axial strength Pn,max factors | Pn,max cap, Interaction diagram, Spiral reinforcement |
| §22.5.3.1 | Concrete shear strength Vc | Beam shear design, Footing one-way shear |
| Table 22.5.5.1 | Vc equations (one-way shear) | Beam shear design, Footing one-way shear, Footing design example, Beam design example |
| §22.5.5.1.3 | Size effect factor λs | Beam shear design |
| §22.6.2.1 | Critical section shape (punching) | Footing punching shear |
| Table 22.6.5.2 | vc equations for punching shear | Footing punching shear, Footing design example |
Chapter 24: Serviceability
| Clause | Description | Methodology page(s) |
|---|---|---|
| §24.2.3 | When to compute deflection | Beam deflection |
| Table 24.2.2 | Allowable deflection limits | Beam deflection |
| Table 24.2.3.5 | Bischoff effective moment of inertia Ie | Beam deflection, Beam design example |
| §24.2.4.1 | Long-term deflection multiplier | Beam deflection |
| §24.3.2 | Crack control bar spacing | Beam crack control, Beam design example |
| Table 24.4.3.2 | Shrinkage/temperature reinforcement | Footing flexure, Footing design example, Wall footing design |
Chapter 25: Reinforcement Details
| Clause | Description | Methodology page(s) |
|---|---|---|
| Eq. 25.4.2.4a | Development length equation | Footing development length, Wall footing design |
| §25.4.1.4 | Excess reinforcement reduction | Footing development length |
| Table 25.4.2.5 | ψ modification factors | Footing development length |
| §25.7.2.1-3 | Tie spacing rules (48db, 16db, least dimension) | Column tie spacing |
| §25.7.3 | Spiral reinforcement requirements | Spiral reinforcement |
ASCE 7-22: Load Combinations
| Section | Description | Page(s) |
|---|---|---|
| Section 2.3 | LRFD load combinations | Glossary: LRFD, Load combination calculator |
| Section 2.4 | ASD load combinations | Glossary: ASD, Load combination calculator |
IBC: International Building Code
| Table | Description | Page(s) |
|---|---|---|
| Table 1806.2 | Presumptive bearing values | Footing bearing pressure, Footing design example |