How much weight can safely be suspended from center of 2"x2" square tube 9' long?

[Everhard]

Re: How much weight can safely be suspended from center of 2"x2" square tube 9' long?

Another option is use the fork lift - lift the load and put a support under each tine cut to the right length so that it won't drop back down. (a 4x4 for example.) If you want to play it a bit safer doing this method then put the post (4x4) directly against the forklift under the tine and then if possible put a strap around it so it can't slide off some how.

E.

 

[RedNeckRacin]

Re: How much weight can safely be suspended from center of 2"x2" square tube 9' long?

One thing to mention, if you are using a lift that a shock load can be orders of magnitude greater than a safe static load.

 

[LD1]

Re: How much weight can safely be suspended from center of 2"x2" square tube 9' long?

For 2x2x3/16 tubing spanning 9'......

Maximum load before it remains permanently bent is 1185#, and will deflect 1.62" at at that point. Any more......it remains bent.

For 1/8 wall 2x2.... 900# and would deflect the same 1.62"

If you had 1/4 wall tube, 1380# and still 1.62 deflection

But keep in mind, most overhead lifting devices have a 5:1 safety factor if the load is gonna be moving around, and a 3:1 at least for a static load.

..................Max before bending..............3:1 SF................5:1SF
1/8 wall...............900#..........................300#.................180#
3/16 wall.............1185#.........................395....................237#
1/4 wall...............1380#.........................460#.................276#

I would even feel confident in the 3/16 wall tube with 400# on it. I'd either beef it up as described, or go back to the scrap pile and look for something with a little more depth.

Even going up just one size to 2.5" square with 3/16 wall will give 2000# before failure @ 1.30" deflection. Thats 400# with a 5:1 SF and 667# with a 3:1 SF

 

[Industrial Toys]

Re: How much weight can safely be suspended from center of 2"x2" square tube 9' long?

Interesting data. Surprised the deflection is the same for all thicknesses.

 

[Will S]

Re: How much weight can safely be suspended from center of 2"x2" square tube 9' long?

Interesting data. Surprised the deflection is the same for all thicknesses.

It appears the 1.62" deflection was chosen for the test, and they checked how much weight at different thickness, would deflect that much.

Yes, definitely good info there.

I may have access to a portable shop crane, so this project may not even happen, but I appreciate all the input from forum members. Thank you!

 

[LD1]

Re: How much weight can safely be suspended from center of 2"x2" square tube 9' long?

Interesting data. Surprised the deflection is the same for all thicknesses.

It appears the 1.62" deflection was chosen for the test, and they checked how much weight at different thickness, would deflect that much.

Yes, definitely good info there.

I may have access to a portable shop crane, so this project may not even happen, but I appreciate all the input from forum members. Thank you!

The deflection wasnt "chosen", thats just how it calculates.

So basically, it doesnt matter what the wall thickness of the tube is. Weather its 1/8" wall, or 1/2" wall, or even solid. Given a beam spanning 9', and made of 2" x 2".....it is gonna bend permanently if you deflect it beyond 1.620".

The thicker the wall, it takes more weight to make it deflect to 1.620", thus a stronger beam with increased capacity.

 

[Will S]

Re: How much weight can safely be suspended from center of 2"x2" square tube 9' long?

:thumbsup:

 

[SPYDERLK]

Re: How much weight can safely be suspended from center of 2"x2" square tube 9' long?

Interesting data. Surprised the deflection is the same for all thicknesses.

Elastic limit does not change.

 

[Streetcar]

Re: How much weight can safely be suspended from center of 2"x2" square tube 9' long?

The question that has not been ask yet.
What is the strength of the steel in the tube

 

[SPYDERLK]

Re: How much weight can safely be suspended from center of 2"x2" square tube 9' long?

The question that has not been ask yet.
What is the strength of the steel in the tube

Good point. Std is ~ ?40KSI?. I imagine higher strengths are available. These would have a greater elastic limit allowing more deflection before bending.