Add A992 to existing A36 steel?
Add A992 to existing A36 steel?
(OP)
A current power plant project was built in the mid 1970s entirely of A36 steel. I'm adding steel to support some new equipment. Are there any issues with adding steel that is A992 (Fy=50ksi) and welding it to new A36 angles or existing A36 steel? Also, is there an online resource/database that states if a particular steel shape is commonly available (in either A36 or A992)?






RE: Add A992 to existing A36 steel?
RE: Add A992 to existing A36 steel?
I don’t quite agree with Jayrod12, but I suspect if he were teased to be more specific he wouldn’t disagree with me. Design the new members to their strength (A992), but then, you must pay attention to how the new members load and stress the old members ( at A36) and you certainly must pay attention to this strength difference, and design for it, at the connections. You’re not specific about the connections: if bolted, you must look at both strengths on the two halves of the connection, if welded, the same thing, A36 on its half of the connection and 50ksi on the A992 half of the connection. Use a welding rod/wire process which matches the A992 and you should be safe.
RE: Add A992 to existing A36 steel?
As for availability, assume all tee sections from wide flanges and all wide flanges are available in A992. For anything outside of that definitely call around to your local metal supply companies.
Maine EIT, Civil/Structural.
RE: Add A992 to existing A36 steel?
I believe that OP just wants to slip some new steel into the framing system, not reinforce exitsing members. If that is the case, there are no issues to be concerned about that I know of.
Most "least weight" wide flange beams are readily available if you have a steel manual handy
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.
RE: Add A992 to existing A36 steel?
RE: Add A992 to existing A36 steel?
The remaining design of new members you can absolutely use the higher strength, just ensure your connection to existing framing can provide the required resistance.
RE: Add A992 to existing A36 steel?