is it a good idea to reinforce a tubular section with a channel to help take up bending?

[HanStrulo]

Hi Eveyone,

Is it feasible, or a good idea to reinforce a tubular section with a channel to help take bending?

the load is applied on the tubular side ( the channel side will be in tension). the channel will act as a sort of cover plate to help with bending.

Thanks

 

[RPMG]

Only if done correctly

 

[rb1957]

you mean to either ...
1) wrap a channel around one 1/2 of a square tube. or
2) place a channel on one side of a tube, with the flanges on the opposite (non-tube) side ?
ie flanges up or flanges down ?

in any case, you experience says it's difficult to reinforce a bending member on only one side of the NA. Assuming symmetry, then reinforcing one side pulls the NA towards that side and makes the situation worse for the other side (any gain in "I" is lost in "y").

another day in paradise, or is paradise one day closer ?

 

[RPMG]

If you increase area, Ag, and depth, d, you increase the capacity of the section. Always.

 

[dhengr]

HanStrulo:
You would probably be better off using two pieces of bar stock, one on top and one on the bottom. Make the bars a little narrower than the flat width of the tube section, and adjust the thickness as needed, so you can use fillet welds rather than a flare-bevel-groove weld to join the parts.

 

[BAretired]

A good idea? Depends on how you define good. I would prefer to select a larger HSS to avoid the necessity of welding. Adding a channel (or a plate) on the tension side will increase the bending resistance of a tubular section. Adding a channel or plate on both sides will increase the bending resistance more per unit weight of metal added. That is, keeping symmetry of the section is more effective per pound of added material.

BA

 

[desertfox]

Hi

Why not provide a sketch you what you are wanting to do, a sketch will speak a 1000 words.

“Do not worry about your problems with mathematics, I assure you mine are far greater.” Albert Einstein

 

[HanStrulo]

Thanks for all the responses.

the tubular section is already installed. it's a pile that is already in the ground and only one side is exposed. (the tension side).

My only option now is a channel in one side which will make it only symmetrical in one axis.

to help add some safety, I have only used the elastic capacity of the section since the code does not allow the full plastic capacity for non doubly symmetric sections.

The section is also continuously braced (because it's inside of an excavation).