3.1. Design Procedure

Try these first

1. 1.

   What is the purpose of calculating the factored axial load in column design?

   Hint

   Think about safety factors.

2. 2.

   Name one common type of rolled steel section used for columns.

   Hint

   What familiar names have you heard?

3. 3.

   What is the primary purpose of the slenderness ratio in column design?

   • To measure strength
   • To prevent buckling
   • To determine cost

   Hint

   Consider what happens if a column is too slender.

4. 4.

   True or False: Battens are designed to provide diagonal support in columns.

   • True
   • False

   Hint

   What shape are battens laid out in?

5. 5.

   Given a built-up column comprised of two ISMB sections connected with lacing, calculate the effective length if the total height is 6 meters.

   Hint

   Consider how supports affect lengths.

6. 6.

   A built-up column needs to support a load of 450 kN. If the concrete strength is 30 MPa, what is the minimum area of the slab base plate?

   Hint

   Use the given formula for area and check your unit conversions.