Calculating Square Tubing Dimensions for Vertical Bicycle Support

[drianengelbre]

I would like to know which calculations to use to determine the dimensions, including the thickness of square tubing that needs to carry a load of 6 bicycles each weighing 18kg. The bicycles are vertically suspended from the tubing and the support is in the middle of the tubing so the ends are free.

 

[nvn]

drianengelbre: (1) What is the spacing (a2) between each bicycle centerline? (2) What is the spacing (a1) between the inboard bicycle centerline and the vertical post centerline? (3) What is the square tubing material, and the material specification number, and tensile yield strength? (4) Is this a school homework problem?