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I'm enrolled in College in the civil engineering program and am looking for guidance with calculating strength of steel square tubing.

We are making a project that has parameters.

1- Must be made of steel

2- 4"x6"x36" is maximum OD of section.

3- 14 lbs is maximum weight

4- the load will be applied at the connection, from the top aimed straight down

We are working on a reasonable budget and I'm working on simple, strong, efficient, designs.

Two of these pieces will be connected to each other, so there will be a connection point.

So far I'm thinking 3x3" square tubing with a wall thickness of 11 gauge at 34" long should do the trick. Looks like 10.6 lbs (according to website lists)

What types of steel should I be considering?

How do I calculate the strength of steel square tubing?

How to I calculate the connection points?

Should I scratch the idea of square tubing and go to a more complex design, like truss design?

Thank you