When designing steel structures in accordance with AISC 360, accurately determining the section properties of built-up steel members is crucial for ensuring both safety and efficiency. This is particularly important for mono-symmetric wide flange sections, where different flange sizes can complicate the calculations. These sections could also be referred to as singly-symmetric wide flanges, unequal wide-flanges, or an unequal I/H section. In this post, we'll walk through the process of calculating essential section properties such as areas, moments of inertia, radius of gyration, plastic and elastic section modulus, locations of the centroid and plastic neutral axis, and the torsional constant. All of these are important properties that are typically necessary in structural design. By understanding how to compute these values, you'll be better equipped to perform precise and reliable structural designs for built-up steel members.
Example Section (Solutions Provided Using CalcBook): Section Geometry
Area of Section
Location of Centroid
Moment of Inertia and Radius of Gyration About X-Axis
Moment of Inertia and Radius of Gyration About Y-Axis
Location of Plastic Neutral Axis
Plastic Section Modulus About X-Axis
Plastic Section Modulus About Y-Axis
Elastic Section Modulus About X-Axis
Elastic Section Modulus About Y-Axis
Torsional Constant
