United StatesAISC 360-22 (ASD)
Design hot-rolled steel columns and posts to AISC 360-22 ASD, the current edition for 2024 IBC projects, using service-level loads. Checks cover allowable axial compressive strength, flexural buckling, and combined axial-plus-bending interaction. Column loads link from beams above to footings below automatically.
Method & scope
Calculation method
The Steel Column (ASD, AISC 360-22) calculator designs hot-rolled steel columns and posts using Allowable Stress Design per the latest edition of the AISC Specification. It runs a first-order structural analysis to determine service-level demands, then applies AISC 360-22 allowable capacity equations for all limit states.Structural analysis
The calculator performs FEA on the column as a beam-column, resolving axial forces, moments, and deflections under service loads. End conditions (pinned, fixed, roller) are specified at each support. Concentrated axial and distributed lateral loads can be applied at any height. A first-order moment amplification factor accounts for P-delta effects; the member is assumed to be part of a braced frame.Axial compression capacity
Allowable axial compressive strength follows AISC 360-22 Chapter E: utilization = Pa / (Pn / Omega_c) ≤ 1.0 where Omega_c = 1.67. The nominal compressive strength Pn is governed by flexural buckling for doubly-symmetric shapes. For singly-symmetric and unsymmetric sections, flexural-torsional buckling is additionally evaluated. Slender element Q factors are applied per Section E7 where local buckling reduces the available strength.Flexural capacity
Moment demands from eccentricity or lateral loads are checked per AISC 360-22 Chapter F: utilization = |Ma| / (Mn / Omega_b) ≤ 1.0 where Omega_b = 1.67. Compact, non-compact, and slender section classifications per Table B4.1b govern the applicable strength equations. Lateral-torsional buckling is evaluated against the unbraced length and limiting lengths Lp and Lr.Combined axial compression and bending
The AISC H1-1 interaction check (ASD form) covers simultaneous axial and biaxial bending:- For Pa * Omega_c / Pn ≥ 0.2: (Pa * Omega_c / Pn) + (8/9) * (Mxa * Omega_b / Mnx + Mya * Omega_b / Mny) ≤ 1.0
- For Pa * Omega_c / Pn < 0.2: (Pa * Omega_c / 2Pn) + (Mxa * Omega_b / Mnx + Mya * Omega_b / Mny) ≤ 1.0
Axial deformation
Axial shortening under service loads is calculated and reported alongside strength checks for serviceability review.Outputs
Results are displayed as color-coded utilization ratios for each limit state with code clause references. The governing check, critical load case, and section properties are summarized for report documentation and QA review.How to use it
1
Open the calculator
Open it from Run calc in the About this calculator panel above. To start from a typical setup, choose one of the presets listed there.
2
Enter your inputs
Work through the input sections from top to bottom. Click any input label to see its reference explanation, clause, conditions and assumptions. See Checks, References, Conditions and Assumptions.
3
Review the results and export
Check the utilization of each governing check in the summary, then export a PDF report. See Views and Export.
US Steel Column (ASD): Overview
US Steel Column (ASD): Example
Available presets
Each preset opens the calculator with a typical setup already entered.Common questions
What design method and code does this calculator use?
What design method and code does this calculator use?
The calculator uses Allowable Stress Design (ASD) per AISC 360-22, the current edition of the AISC Specification. Unfactored service-level loads are compared against allowable capacities (nominal strength divided by Omega safety factors).
What are the key inputs?
What are the key inputs?
Key inputs include column height, end conditions (pinned, fixed, roller), service-level axial loads with optional eccentricity, distributed lateral loads, and effective length factors Kx and Ky. The steel section is selected from the AISC shape database or entered as a custom section.
What limit states does it check?
What limit states does it check?
The calculator checks allowable axial compressive strength (flexural and flexural-torsional buckling), allowable flexural strength including lateral-torsional buckling, and combined axial compression plus biaxial bending interaction per AISC 360-22 Chapter H ASD provisions.
How does AISC 360-22 affect ASD column design compared to 360-16?
How does AISC 360-22 affect ASD column design compared to 360-16?
AISC 360-22 refines the slender element reduction provisions in Chapter E and updates references to align with the 2022 AISC Steel Construction Manual. For most standard W-shape columns under ASD the capacity differences are small, but 360-22 is required for projects submitted under the 2024 IBC.
How do I set effective length factors (K-factors)?
How do I set effective length factors (K-factors)?
Kx and Ky are entered as direct inputs. For braced frames K = 1.0 is conservative. The AISC Commentary alignment charts provide K-factors for frames with partially restrained end conditions. More precise K-factors can be derived from a stability analysis of the full frame.
Can this calculator receive loads from a beam and pass axial load down to a footing calculation?
Can this calculator receive loads from a beam and pass axial load down to a footing calculation?
Yes, column axial load can be linked from beam reaction outputs above, and the resulting column base reaction links to a footing or base plate calculation below. Changes propagate automatically across the full load path.
Next steps
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