A built-up column is made of four angles, as shown in. The angles are held together with l...

A built-up column is made of four angles, as shown in. The angles are held together with lacing bars, which can be neglected in the analysis of geometrical properties. Using the standard Johnson or Euler equations with Le = L and a design factor of 3.0, compute the allowable load on the column if it is 18.4 ft long. The angles are of ASTM A36 steel.

 Figure

FIGURE PI   Built-up column cross section for Problem.