Base Plate + Moment

Steel column base plate with moment — bearing, anchor tension & plate thickness (AISC DG1).

AISC Design Guide 1 (LRFD). Enter factored Pu and Mu. Concrete f'c is the pier/pedestal strength; anchor Fnt and area come from the rod spec (F1554).

Design diagram — updates live with your inputs

Plate & Column

Plate length N (in)i Along the moment

Plate width B (in)i

Column depth d (in)i

Provided thickness (in)i

Materials

Concrete f'c (psi)i Pier/pedestal

Plate Fy (ksi)i A36 = 36 ksi

sqrt(A2/A1)i Bearing confinement, 1.0-2.0

Anchors

Tension-side anchorsi

Anchor area each (in^2)i 3/4in=0.44, 1in=0.79

Anchor Fnt (ksi)i F1554 Gr.36 ~ 90 ksi

Edge to anchor (in)i Plate edge to bolt line

Factored Demands

Factored axial Pu (kip)i

Factored moment Mu (kip-ft)i

ACI 318-19

Validation, assumptions & limitations Download validation report (PDF) ↗

This calculator is verified by 4 independent tests comparing its output against closed-form statics, NDS/SDPWS design-standard values and published worked examples. Full case-by-case results are in the PDF report.

Assumptions

LRFD; concrete bearing per AISC J8.
e = 6.4 in <= e_crit -> full bearing, no anchor tension.
Plate thickness from cantilever-strip bending.

Limitations

Large-eccentricity anchor-tension branch validated by the JS parity.
Anchor breakout/pryout (ACI 17) checked separately.

Results are for preliminary design and must be confirmed by a licensed engineer against the current adopted code and project-specific conditions.