M12.5X11.6 Steel Miscellaneous beam — Section Properties
Dimensions
| Property | Value | Unit |
|---|---|---|
| Depth (d) | 12.5 | 317.5 mm |
| Flange Width (bf) | 3.5 | 8.89 cm |
| Flange Thickness (tf) | 0.211 | 5.4 mm |
| Web Thickness (tw) | 0.155 | 3.9 mm |
| Area (A) | 3.4 in² | 21.9 cmÃÂò |
| Weight | 11.6 lb/ft | 17.3 kg/m |
Elastic Section Properties
| Property | Strong Axis (X-X) | Weak Axis (Y-Y) | Unit |
|---|---|---|---|
| Moment of Inertia (I) | 80.3 | 1.51 | in⁴ |
| Elastic Section Modulus (S) | 12.8 | 0.864 | in³ |
| Plastic Section Modulus (Z) | 15 | 1.37 | in³ |
| Radius of Gyration (r) | 4.86 | 0.667 | in |
Torsional Properties
| Property | Value | Unit |
|---|---|---|
| Torsional Constant (J) | 0.041 | in⁴ |
| Warping Constant (Cw) | 57.1 | in⁶ |
| Distance Between Flange Centroids (ho) | 12.3 | in |
| Effective Radius (rts) | 0.852 | in |
Section Profile Summary
This is a standard hot-rolled section profile covered by AISC 360. The tabulated section properties are computed from the nominal dimensions per the governing material standard. With Ix = 80.3 in⁴, the strong-axis flexural stiffness is suitable for preliminary sizing of beams and beam-columns.
At 12.5" deep and 11.6 lb/ft, this is a mid-range section suitable for floor beams, roof framing, and columns in low-to-mid-rise structures.
Key Design Checks (AISC 360)
| Check | Formula | This Section |
|---|---|---|
| Plastic moment | Mp = Zx × Fy | 750 kip-in |
| Deflection | Δ = 5wLâÃÂô/(384EIx) | Use Ix = 80.3 in⁴ |
| Torsion | St. Venant = GJ/L | J = 0.041 in⁴ |
| Column buckling | KL/r âÃÂàFcr | r_x = 4.86 in |
Design Notes
- Compactness: Verify flange and web slenderness against AISC 360 Table B4.1 classification limits for the governing load case (pure compression, pure flexure, or combined).
- Combined loading: For members under simultaneous axial force and bending, use the interaction equations in AISC 360 Section H. The governing equation depends on the ratio of required to available axial strength.
- Connection limit states: Check bolt bearing, tear-out, block shear, and weld strength at all connections. The governing connection limit state often controls the member size selection.
Verification (AISC 360): All designs using this section must be verified by a licensed Professional Engineer. Before finalizing member selection, check beam-column interaction (P-M), lateral-torsional buckling, serviceability deflections, and all connection limit states. See Engineering Disclaimer.
Related Resources
- Steel Beam Capacity Calculator
- Column Capacity Calculator
- Beam Deflection Calculator
- Section Properties Calculator
- Steel Grades Reference
- Section Comparison Tool
Design Resources
- Section Properties Lookup — Compare with similar sections
- Steel Beam Sizes Reference — Standard beam dimensions
Educational reference only. Verify all section properties against the current AISC 360 Manual and mill certificates before design. Results are PRELIMINARY — NOT FOR CONSTRUCTION.