AISC Steel Construction Manual — 16th Edition
The companion to AISC 360, providing design tables, beam selection charts, column load tables, connection details, weld specifications, bolt capacities, and standard practice aids for structural steel design in the United States.
Scope
The AISC Steel Construction Manual, 16th Edition, is the definitive practical reference for structural steel design in the United States. It complements the AISC 360-22 Specification by providing all design aids, tables, and standard practice information needed for daily engineering work. The manual spans over 2,000 pages across 17 parts, covering beam and column design tables, connection details, member dimensions, section properties, and construction tolerances. It is published by the American Institute of Steel Construction and updated every four to six years to align with the latest edition of AISC 360.
Purpose
The purpose of the AISC Manual is to provide practicing structural engineers with ready-to-use design tables and aids that eliminate repetitive calculations. Rather than computing beam capacity from first principles each time, engineers can look up available moment capacity for any W-shape at any unbraced length. Column tables provide axial compressive strength for all standard sections over a range of effective lengths. Connection tables give bolt shear and tension capacities, weld strengths, and standard connection details. The manual also includes design examples, code commentary, and recommended specifications for fabrication and erection. It serves as the single-source reference that bridges code requirements and practical design office workflows.
Engineering Applications
The AISC Manual is used in nearly every steel building and bridge project in the United States. Applications include beam selection for floor and roof framing, column design for multi-story buildings, connection design for shear and moment connections, base plate and anchor rod design, and bracing member design. The manual is also used for crane runway girders, truss design, composite beam and slab systems, and seismic force-resisting systems per AISC 341. Part 17 of the manual provides tables specifically for hollow structural sections (HSS), used in tubular construction, sign structures, and architectural exposed steel.
Design Philosophy
The AISC Manual follows the same LRFD and ASD dual-methodology as AISC 360. Tables present values for both design approaches: LRFD values are marked with φ (resistance factor applied), and ASD values are marked with Ω (safety factor applied). The manual is organized so that design aids correspond directly to specific chapters of AISC 360. For example, beam selection charts in Part 3 correspond to Chapter F (flexure), column load tables in Part 4 correspond to Chapter E (compression), and connection tables in Part 7 through Part 10 correspond to Chapter J (connections). This one-to-one mapping allows engineers to move seamlessly between the specification requirements and the design aids.
Important Requirements
Users of the AISC Manual must understand several critical conventions. All table values for W-shapes are based on ASTM A992 steel (Fy = 345 MPa, Fu = 450 MPa) unless otherwise noted. Channel and angle tables use ASTM A36 (Fy = 250 MPa). HSS tables use ASTM A500 Grade C (Fy = 317 MPa for rectangular, Fy = 269 MPa for round). Beam tables assume the compression flange is adequately braced at the tabulated unbraced length Lb. Column tables assume pin-pin end conditions (K = 1.0) with load applied concentrically. Connection tables assume standard hole sizes, ASTM A325 or A490 bolts, and matching electrodes for welds. Any deviation from these base assumptions requires adjustment using the provided modification factors.
Key Parameters
The following table presents typical W-shape section properties as used in the AISC Manual's beam and column design tables. These values are excerpted from Part 1 of the manual.
| Section | Depth d (mm) | Web tw (mm) | Flange bf (mm) | Flange tf (mm) | Ix (106 mm4) | Sx (103 mm3) | Zx (103 mm3) | rx (mm) |
|---|---|---|---|---|---|---|---|---|
| W360×110 | 360 | 11.4 | 256 | 21.6 | 471 | 2,620 | 2,980 | 155 |
| W410×75 | 410 | 9.1 | 230 | 17.3 | 433 | 2,110 | 2,400 | 175 |
| W460×89 | 460 | 10.5 | 230 | 19.6 | 634 | 2,760 | 3,130 | 190 |
| W530×109 | 530 | 11.6 | 244 | 20.8 | 993 | 3,750 | 4,270 | 220 |
| W610×140 | 610 | 13.1 | 267 | 23.6 | 1,730 | 5,670 | 6,460 | 250 |
Note: Section properties in the AISC Manual are tabulated in both SI (metric) and U.S. customary units. The values above are representative. Always use the official printed or digital edition for project-specific design.
Beam selection charts in Part 3 present φbMn versus unbraced length Lb for each W-shape, with the characteristic three-zone shape reflecting Lp and Lr. Column load tables in Part 4 give φcPn for KL ranging from 2.0 m to 12.0 m about both principal axes. Bolt shear and tension capacities for ASTM A325, A490, F1852, and F2280 fasteners are tabulated in Part 7 by bolt diameter and thread condition. Weld strength tables in Part 8 provide the design strength per unit length for fillet and groove welds based on electrode classification and base metal strength.
Practical Engineering Notes
Experienced engineers develop a mental catalog of typical sections for common spans and loads. For office building floors with spans of 9-12 m and loads of 4-6 kPa, W460×74 to W530×109 are common beam selections. Columns in low-rise buildings (3-6 stories) typically range from W310×79 to W360×147. For heavily loaded columns in high-rise construction, W360×410 sections with 50 mm flange thickness are available in the manual. The Manual also includes valuable coped beam detailing, standard connection geometry, and erection clearances that are essential for coordinating with structural detailing and fabrication.
Field Tip: When selecting beams from the manual charts, aim for 70-90% utilization. The lightest section that works is not always the most economical when accounting for camber requirements, connection costs, and depth restrictions for floor-to-floor height.
Typical Workflow
A typical design using the AISC Manual proceeds as follows: determine factored loads and compute maximum moment and shear. Select a trial W-shape from Part 3 beam charts based on required flexural strength and unbraced length. Verify the section is compact using Part 1 section properties and compactness limits. Check shear capacity using Part 3 shear tables. Check deflection serviceability using Ix from Part 1. Design connections using bolt and weld capacities from Part 7 and Part 8, following standard connection details in Part 10 through Part 13. Finally, verify column capacities using Part 4 column tables if the beam frames into columns.
Common Mistakes
Warning: A frequent error is using beam chart values from the wrong section of the manual — for example, using LRFD values when designing with ASD without converting, or reading the capacity for the wrong unbraced length. Another common mistake is neglecting to adjust column table values for the correct effective length factor K (tables assume K=1.0). Engineers also frequently overlook the footnotes in connection tables that specify limits on bolt spacing, edge distance, and material thickness.
Best Practices
Always verify the applicable AISC 360 edition year and ensure the manual edition matches. Use the Part 1 section property tables as a centralized reference for all member checks. For repetitive design, create spreadsheet tools referencing the manual tables to speed up iteration. Keep the manual open to the appropriate part while reviewing calculation sheets. For connection design, the cop and block shear checks in Part 9 are frequently missed; make them a standard part of every connection design review. Use the manual's standard connection details as a starting point and modify only when project conditions require.
Limitations
The AISC Manual tables are based on standard assumptions that may not apply in every situation. Beam tables assume uniformly distributed gravity loads and uniform lateral bracing. Column tables assume concentric axial load only. Connection tables cover standard configurations but may not address unusual geometries. The manual does not replace sound engineering judgment or detailed analysis. Special structures such as transmission towers, industrial crane buildings, and seismic force-resisting systems in high-seismic regions require reference to AISC 341, AISC 303, and project-specific criteria beyond the manual's scope.
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References
- AISC. Steel Construction Manual. 16th ed., American Institute of Steel Construction, 2023.
- AISC 360-22. Specification for Structural Steel Buildings. AISC, 2022.
- AISC 341-22. Seismic Provisions for Structural Steel Buildings. AISC, 2022.
- AISC 303-22. Code of Standard Practice for Steel Buildings and Bridges. AISC, 2022.
- Salmon, C.G., Johnson, J.E., and Malhas, F.A. Steel Structures: Design and Behavior. 5th ed., Pearson, 2009.