Sample calculations
14 worked examples across columns, beams, and footings. Each case runs the full ACI 318-19 engine with real results: interaction diagrams, DCR tables, deflection checks, and more. Modify the inputs and rerun, free, no signup.
Columns (10)
16x16 Short Column, 8-#9, f'c = 5,000 psi
Short tied column with two-face reinforcement per ACI 318-19: axial-moment interaction, phi factor, tie spacing. Verified against Wight Example 11-1.
16x22 Column, 8-#8, Pu = 680 kip (Marginal FAIL)
Near-capacity 16x22 / 8-#8 column per ACI 318-19: D/C ratio exceeds 1.0, showing a marginal FAIL verdict. Based on Wight Example 11-4 LC1.
16x22 Column, 8-#8, Pu = 170 kip (Transition Zone)
Transition-zone demand for a 16x22 / 8-#8 column per ACI 318-19: phi interpolation between compression-controlled and tension-controlled limits.
16x16 Column, Min-Eccentricity Advisory
Minimum-eccentricity advisory for a 16x16 / 8-#9 tied column per ACI 318-19: M2,min evaluation when the applied moment is small or zero.
14x14 Slender Column, k = 0.86, Lu = 22 ft
Slender 14x14 column per ACI 318-19: non-sway moment magnification (delta_ns), effective stiffness (EI)eff, and critical buckling load Pc.
20-in Circular Spiral Column, 8-#10, f'c = 5,000 psi
Circular spiral column check per ACI 318-19: 20-in diameter, 8-#10 bars, bar-ring orientation sweep, spiral conformance, and D/C ratio.
16x24 Column, 8-#9, Bending About Y-Axis
Rotated-axis (about Y) column check for a 16x24 / 8-#9 section per ACI 318-19: b as depth, two-face reinforcement layout and D/C.
16x20 Biaxial Column, 10-#8
Biaxial bending for a 16x20 / 10-#8 column per ACI 318-19: demand-plane cut through the 3D P-Mx-My interaction surface and D/C.
16x24 Biaxial Column, 4-#8
Biaxial bending demonstration for a 16x24 / 4-#8 column per ACI 318-19: full 3D interaction surface at f'c = 5,000 psi, Grade 60.
16x16 Sway-Frame Column, 8-#9
Sway-frame column with moment magnification for unbraced frames per ACI 318-19: delta_s, along-length check, f'c = 5,000 psi.
Beams (2)
12x24 Rectangular Beam, 4-#8
Rectangular beam per ACI 318-19: flexure, shear, deflection, and crack control for a 12x24 / 4-#8 section. Grade 60 steel.
48x24 T-Beam, 6-#8
T-beam with effective flange width per ACI 318-19: flexure, shear, deflection, and crack control for a 48x24 / 6-#8 section.
Footings (2)
60x60x18 Isolated Footing, 16-in Column
Spread footing per ACI 318-19: bearing, flexure, one-way shear, punching shear, and development length for a 60x60x18 footing.
48x12 Wall Strip Footing, 12-in Wall
Wall strip footing per ACI 318-19: bearing, flexure, one-way shear, and development length for a 48x12 footing under a 12-in wall.