Angle Section Properties

Rating:
17

Description


Like many others, I discovered through experience that the principal axis section modulus values for angles provided in the 13th Edition AISC manual are incorrect. While the principal axes moment of inertia values are accurate, the 'c' value used to calculate the section modulus was consistently incorrect. To address this and provide more comprehensive information, Version 2.0 now includes the following enhancements:

  1. Angle Leg Orientation: The worksheet now allows you to specify the orientation of the angle legs and subsequently calculate the section properties about this modified axis orientation. The configurations addressed include:

    • SLVD: Unequal leg - short leg vertically down
    • SLVU: Unequal leg - short leg vertically up
    • LLVD: Unequal leg - long leg vertically down
    • LLVU: Unequal leg - long leg vertically up
    • EQVLD: Equal leg - long leg vertically down
    • EQVLU: Equal leg - long leg vertically up
  2. Beta w Factor Calculation: The worksheet now includes the calculation of the Beta w factor, which is used in the 13th Edition AISC Manual - equation F10-6 for calculating allowable moments about the major principal axis for unequal length angles. The correct sign of Beta w, which depends on whether the shear center is in flexural compression or tension, is also calculated.

  3. Torsional Resistance Factor (J) Calculation: The worksheet now calculates the torsional resistance factor, J.

  4. Extreme Fiber Distances Calculation: The worksheet now calculates the distances from the neutral axis to all angle tip points.

Please note that while the worksheet is protected, it does not require a password.

Calculation Reference
AISC 13th Edition
Modern Formulas for Statics and Dynamics
Structural Steel Designer's Handbook

Calculation Preview

Uploaded
24 Apr 2011
Last Modified
20 Jun 2023
File Size:
55.05 Kb
Downloads:
230
File Version:
2.0
File Author:
Steven Capri
Rating:
17

 
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Comments: 5
JohnDoyle[Admin] 11 months ago
Description updated.
ehabalieed 3 years ago
excellent
yosso 5 years ago
Superb workbook - nicely formatted and laid out in a logical manner.
docapri 13 years ago
If you are like me you may have found out the hard way that the values published in the 13th Edition AISC manual for the principle axis section modulus for angles are incorrect. Although the values for principle axes moment of inertia are correct, an incorrect value of
JohnDoyle[Admin] 13 years ago
Thanks for the calculation Steven. I have extended your subscription by 3 months by way of thanks.