21. UNBRACED ROLLED STEEL BEAMS

Try these first

1. 1.

   What is an unbraced beam?

   Hint

   Consider how beams are typically supported.

2. 2.

   Name a type of torsion that affects beams.

   Hint

   Think about pure twisting mechanisms.

3. 3.

   What is lateral torsional buckling?

   • A type of steel
   • A failure mode in beams
   • A type of joint

   Hint

   Think about how a beam reacts under unsupported conditions.

4. 4.

   True or False: Saint-Venant's torsion only occurs with out-of-plane bending.

   • True
   • False

   Hint

   Recall the definition and effects of each type of torsion.

5. 5.

   Design a beam to support a load of 5000 N applying proper AISC equations. Determine the necessary dimensions to prevent lateral torsional buckling.

   Hint

   Consider moment calculations and compare them to the load.

6. 6.

   You have a beam with known lengths and moment values. Calculate the C factor for varying load scenarios and determine which loading condition poses the greatest risk of lateral torsional buckling.

   Hint

   Focus on understanding how varying moments affect the C factor.