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"TORSION9" --- SIMPLIFIED TORSION ANALYSIS FOR STEEL BEAMS
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Program Description:
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"TORSION9" is a spreadsheet program written in MS-Excel for the purpose of simplified analysis and code
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checking of steel beams subjected to torsional loading. Specifically, six (6) different beam and loading
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configurations can be analyzed / code checked per the AISC 9th Edition Allowable Stress Design (ASD) Manual.
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Both actual and allowable stresses are computed, with the final result being a computed "stress ratio" of actual
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stress/allowable stress. Finally, the total angle of twist resulting from the torsional loading is determined.
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This program is a workbook consisting of seven (7) worksheets, described as follows:
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Worksheet NameDescription
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DocThis documentation sheet
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Cantilever - Ecc. Conc. LoadCantilever Beam with Eccentric Concentrated Load at Free End
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Simple Span - Ecc. Conc. LoadSimple Span Beam with Eccentric Concentrated Load Applied at Midspan
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Cont. Span - Ecc. Conc. LoadContinuous Beam with Eccentric Concentrated Load Applied at All Midspans
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Cantilever - Ecc. Unif. LoadCantilever Beam with Eccentric Uniformly Distributed Load
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Simple Span - Ecc. Unif. LoadSimple Span Beam with Eccentric Uniformly Distributed Load
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Cont. Span - Ecc. Unif. LoadContinuous Beam with Eccentric Uniformly Distributed Load on All Spans
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Program Assumptions and Limitations:
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1. The simplified torsion analysis used is this program is based on the following reference:
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USS Steel Design Manual (1981), Chapter 7: Torsion (Figures 7.9 & 7.10, pages 157-169),
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by: R.L. Brockenbrough & B.G. Johnston
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2. This program is valid for AISC W, S, M, and HP shapes.
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3. This program uses the database of member dimensions and section properties from the "AISC Shapes
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Database", Version 3.0 (2001) as well as the AISC 9th Edition (ASD) Manual (1989).
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4. This program follows the procedures and guidelines of the AISC 9th Edition Allowable Stress (ASD) Manual
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 (1989).
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5. When the value of 'Lb' is input = 0 (or actually <= 1.0 ft.), this program will use a value = 1.0 ft.
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6. This program utilizes an "Allowable Stress Increase Factor" (ASIF) which is a multiplier of any of the
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calculated allowable stresses Fa, Fbx, and Fby and also the Euler column buckling stresses F'ex and F'ey.
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It is used and appears ONLY in the stress ratio calculation. Typically a value of 1.0 may be used. However, a
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value of 1.333 may be used for load combinations which include wind or seismic loads.
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7. This program does not calculate or check shear or deflection in member
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8. This program does not consider deduction for holes in members subjected to tension.
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9. This program contains numerous “comment boxes” which contain a wide variety of information including
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explanations of input or output items, equations used, data tables, etc. (Note: presence of a “comment box”
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is denoted by a “red triangle” in the upper right-hand corner of a cell. Merely move the mouse pointer to the
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desired cell to view the contents of that particular "comment box".)
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