Calculation Help? How to solve?

[CBRent]

I am struggling with how to calculate the yield strength of a weld.

The leg is 2x2x1/4 angle and is 16.25 inches tall. It is welded to 2x2x.08 tubing. The material is 1018 steel.

The part is constrained in the horizontal. Force is only applied at the bottom edge. 3/16 fillet welds all around. How much force is needed for it to fail at the weld?

 

[racookpe1978]

Well, first off - Why don't you try a few things first: Usually that includes multiplication, division, and statics.

What is YOUR calc of the forces and moments on the bottom weld?
What are YOUR calc's of the properties of the tube steel needed at the bottom weld?
What are YOUR calc's of the required properties of whatever that bottom weld is welded to?

If the "failure zone" so-labelled is at the top weld, what did YOU calc for those welds at the top weld, and why do YOU think they are failing up high, where you are not asking the question?

A bit harsely worded perhaps, but - to be frank, that is why YOU have been told YOU are the degreed engineer. Act like one.

 

[CBRent]

To be frank - what's the point of having a forum where we can ask questions?

I'll figure it out, but I'll need to dig thru a few old books. This hasn't been my forte for a long time.

I assumed someone does this calc all day and could point me in the right direction.

 

[Ron]

Agree with RA, but I'll also offer a few suggestions....

You will have rotation (moment) about the bottom of the angle post. You will also have rotation (moment) at the connection of the tubes to the angle. In addition you will have vertical shear at the tube to angle connections. All welding will have to resist these. I would suggest you look up the weld design in Blodgett.

I don't see any load that would necessary introduce lateral shear into the bottom weld, unless you have loading that is not shown.

 

[hydtools]

Start with a free body diagram and identify the loads, magnitudes and locations, and reactions.

Ted

 

[boo1]

consider posting your work, and people might review it

 

[BUGGAR]

Better description needed. You're welding 0.08" wall tubing with 3/16" weld? Or are you talking about the lower weld? What are you welding the angle to with the lower weld? More 0.08" wall tube? Maybe it would be better if you just weld the angle to the concrete slab. ACI Appendix W now lists electrodes specifically for this work.