Using Zx instead of Sx for Older Structures
Using Zx instead of Sx for Older Structures
(OP)
Do you all use Zx capacity for moment to get a higher capacity of out beams for historical structures that likely used Sx during design? I know case by case basis and connections are often critical, but I'm curious in a general sense. I do a lot of renovation work, and I typically take advantage of it. Especially where there are bearing connections. Any thoughts?






RE: Using Zx instead of Sx for Older Structures
RE: Using Zx instead of Sx for Older Structures
1) keep an eye on the LTB unbraced length as it's different for plastic capacity.
2) for very old work, ensure that the steel is ductile enough to go fully plastic.
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.