Introduction

This lesson covers design settings and lateral stability in built up beams, focusing on the CL factor. Lateral stability calculations are auto-reported, with fastening methods ensuring unit behavior for lateral torsional buckling. The unsupported length option allows calculation based on lateral support points or 0 moment points. An example of a two-span beam illustrates how the unsupported length affects bending. Finally, modifying support conditions impacts moment resistance, as demonstrated by a built-up beam resisting twice the moment force when laterally supported.

Learning Outcomes

By the end of this lesson, you will be able to:

• Analyze the impact of different CL calculation methods in Sizer, including prescriptive assumptions and CSA-based equations, on beam stability.
• Evaluate the effect of fastening methods in built-up beams on moment resistance and structural performance.
• Demonstrate how unsupported length (Lu) calculations influence lateral stability and compare the implications of using lateral support points versus points of zero moment.
• Assess the role of interior support conditions in lateral stability and their effect on a beam’s moment resistance and failure risk.

Instructional Video

Video Run Time: 07:45 minutes