Welding a Beam-Tee
Welding a Beam-Tee
(OP)
Hi fellow
Now I am considering weld a beam-tee to a existing beam to increasing the section's property(Ixx,Zxx, etc). So, should I butt weld the Beam-Tee with full length, or can weld sections with spacing to achieve the same result. Where I can find some information about these topic.
Thanks for your time.
Now I am considering weld a beam-tee to a existing beam to increasing the section's property(Ixx,Zxx, etc). So, should I butt weld the Beam-Tee with full length, or can weld sections with spacing to achieve the same result. Where I can find some information about these topic.
Thanks for your time.






RE: Welding a Beam-Tee
To size the welds, one needs to develop adequate shear capacity between the T and the Beam. The formula to use is:
Shear force = (shear force)x(area of T)x (dist. from centroid of combined section to centroid of T)/(moment of inertia of the combined section) = VQ/I.
This force is then used to determine the area of weld required each side of the max. shear force.
I usually add a few stiffeners between the T and the beam to stabilize the T (to keep it from "rolling over").
Regards,
Jeff
RE: Welding a Beam-Tee
Use a fillet weld if you can. It's cheaper and easier. The VQ/I equation will give you shear flow, force/length. You can calculate the unit capacity of different size fillet welds based on the code that you follow. Then you pick how much weld per foot, say 2 inches every 12 inches for example. I suggest you use the minimum weld size. It is usually easier to fabricate longer smaller welds than less length of a larger weld.
Stiffeners sound like a good idea also.
RE: Welding a Beam-Tee
RE: Welding a Beam-Tee
The amount of weld required reduces towards the centre of the beam as the shear force reduces (for dead and uniformally distributed loads).
RE: Welding a Beam-Tee
A good resource for info on this type work is "Design of Welded Structures" by Omer Blodgett, very affordable at this location
https://s
RE: Welding a Beam-Tee
Also, you may want to evaluate the effects of heat since it sounds like the beam is already loaded. Avoid welding perpendicular to the tension flow! Make sure the steel is in good condition, no corrosion, and abnormalities before welding.
jec67 done an excellent job explaining.
Regards,
Lutfi
www.cdeco.com