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United States
AISC 360-22AISC 360-16

Steel Beam With Torsion (ASD)

Beam reactions link to your column and footing calculations automatically - change a load once and everything downstream updates. For US structural engineers designing closed-section steel beams subject to torsional loading under AISC 360-22 ASD. Checks combined bending, shear, and torsion per Chapter H alongside standard deflection limits.

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What it calculates

Beam reactions link to the columns and footings below, so load changes propagate downstream automatically. Design closed-section steel beams subject to torsion to AISC 360-22 ASD. Combined bending, shear, and torsion are checked per Chapter H alongside standard deflection limits.

Code standards

  • AISC 360-22 (ASD)

Who uses this calculator

Beam reactions link to your column and footing calculations automatically - change a load once and everything downstream updates. For US structural engineers designing closed-section steel beams subject to torsional loading under AISC 360-22 ASD. Checks combined bending, shear, and torsion per Chapter H alongside standard deflection limits.

Check steel beams for torsion when shear loads are offset from the shear centre, combined with bending and shear in one template.

How it calculates

The Steel Beam With Torsion (ASD, AISC 360-22) calculator performs a full ASD strength and serviceability check per the current AISC Specification, extending the standard beam checks with closed-section torsion provisions from Chapter H.

Section classification (AISC 360-22 B4)

Wall slenderness for closed HSS sections is checked against lambda_p and lambda_r limits per B4. The maximum slenderness ratio is also evaluated and reported. Classification governs both the FLB capacity reduction and the section's torsional shear properties.

Flexural capacity - AISC 360-22 Chapter F

Allowable bending moment is Mn / Omega_b with Omega_b = 1.67. For compact closed sections yielding typically governs; for noncompact or slender sections FLB reductions reduce the available strength. LTB is evaluated per Chapter F using Lb, Lp, Lr, and the Cb factor. utilization = M_service / (Mn / 1.67) ≤ 1.0 for positive and negative bending separately.

Shear capacity - AISC 360-22 Chapter G

utilization = V_service / (0.6 Fy Aw Cv1 / 1.67) ≤ 1.0. The web shear coefficient Cv1 is based on the section's h/tw ratio per Chapter G provisions.

Closed section torsion checks - AISC 360-22 Chapter H

Torsional shear stress is calculated from the applied torque using the St. Venant closed-section formula. The combined limit state of torsion, shear, and flexure is evaluated per Chapter H:

utilization = (Combined torsion, shear, and flexure demand) / (Allowable combined strength) ≤ 1.0

The allowable torsion strength is controlled by the onset of yielding under the combined shear stress field from flexure and torsion acting simultaneously. Both the torsion strength check and the combined interaction are reported in the summary.

Load combination analysis

Service-level ASD combinations are evaluated with FEA (D; D+L; D+S; D+0.6W; etc.). The governing combination for moment and for shear is identified. Torsional loads are combined with gravity demands across all applicable combinations.

Deflection checks

Three deflection limits are tracked: instantaneous deflection, long-term deflection (including creep), and simplified DL+(LL or SL) deflection. utilization = delta / delta_allow ≤ 1.0 for each.

Inputs summary

Section (closed HSS), yield strength Fy, span lengths, support types, incline pitch, applied bending loads and tributary widths, required torsional loads, and three sets of deflection limit criteria.

Outputs summary

Summary: allowable bending moment and demand, allowable and actual shear, torsional load and allowable torsion, combined torsion-shear-flexure interaction ratio, maximum slenderness ratio, maximum vertical and horizontal reactions, and three deflection ratios. Reactions are structured for direct load linking to downstream column and footing calculations.

Related calculators

Steel Beam Torsion (ASD, AISC 360-16)→Steel Beam (ASD, AISC 360-22)→Steel Beam (LRFD, AISC 360-22)→Steel Beam (LRFD, AISC 360-16)→

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Frequently asked questions

What design method and code standard does this calculator use?
This calculator uses Allowable Strength Design (ASD) per AISC 360-22, the current edition of the AISC Specification. Combined torsion, shear, and flexure are checked per Chapter H with allowable strengths of Rn / Omega.
What are the key inputs?
Key inputs include section designation (closed HSS rectangular or square), yield strength Fy, span lengths and support conditions, service-level bending loads with tributary widths, required torsional loads, unbraced length, and deflection limit criteria for live load, long-term, and DL+(LL or SL) checks.
What does it check or output?
The calculator checks allowable bending moment (AISC 360-22 Chapter F), allowable shear (Chapter G), torsional strength and combined torsion-shear-flexure interaction (Chapter H), maximum slenderness ratio, and three deflection limits. The summary shows torsional load demand, allowable torsion, combined interaction ratio, and support reactions.
What section types support torsion checks in this calculator?
The torsion module applies to closed HSS sections (rectangular and square tubes) where St. Venant torsion governs. The closed-section torsion formula is used to compute shear stress from torque. Open sections such as W-shapes are not covered by this calculator's torsion provisions.
When should I use this versus steelBeamTorsionASD (AISC 360-16)?
Use this calculator for projects referencing AISC 360-22 or when the authority having jurisdiction requires the current edition. Use steelBeamTorsionASD when the project references AISC 360-16. Both calculators apply ASD with closed-section torsion; the 2022 edition includes minor updates to section classification and LTB provisions.
Does this calculator support load linking with column and footing calculations?
Yes - beam reactions at supports link directly to connected column and footing calculations in the same project. When span length, loads, or member size changes, all connected calculations update automatically - no manual re-entry.

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