Yeah, I've had several fabricators over the years that just fab their own treads out of grating bearing on ledger angles welded to the stringers, especially when odd stair widths are specified. As far as small bolts, the A307 spec goes down to 1/4"Ø and is often fine for small loads.
This has been a very helpful thread - more so than the last 3 days of trying to get answers from the PE boards and SoS offices in several states I'm dealing with. I'm in the same boat of several on this thread of doing a lot of smallish delegated design jobs in multiple states for fabricators...
I'm doing delegated connection design on some moment connections for a steel-framed project in the US. These are Intermediate Moment Frames, so the connections are prequalified WUF-W joints per AISC 358-16. However, the EOR specified a column at one frame that has a 1" narrower flange than the...
Thanks, RWW0002! I should've bought Roark's long ago, but I'll be remedying that shortly.
GC_Hopi: Yeah, I'd already found O'Donnell's equivalent solid strength method on the IPA website, and had used that to check a perforated plate in RAM Elements with 27% of the yield strength based on the...
thread507-446756
Curious if anyone knows where forum member Dreber got the source he posted in the linked thread for checking the strength of perforated plates as a series of equivalent "cables" in tension under a uniform load. It appears the equation for ymax in his example portion of his post...
Since posting, I talked it over with my boss and we came up with an alternate check that seems valid. Curious what other think.
Fisher uses 0.75Fy for the allowable bending stress on the bearing plate in his example, which came from the old SJI criteria for bending on bearing plates (section...
thread507-270827
I found the referenced thread that mentions James Fisher's design method for slotted plate seats for beams bearing opposite steel joists. I've been working through his method to work up a spreadsheet for checking beam connections for either the original slotted plate or for...
Thanks for all the responses. I had to pull away to work on another project and hadn't checked back on this thread yet.
Some answers first:
BARetired - Yes this is what I've heard called a Gerber girder system (primarily Candada, I think?). This is my first exposure to it, and I haven't found...
I've actually been hired by the fabricator to do connection design on any connections not designed by the EOR on a project they're providing the steel for. So asking him to change his typical cantilever layout that he used on 7 buildings this late in the game is probably out of the question...
I'm doing some connection design, and have a case of a beam extending 5' over an HSS column, with a beam splice to the next beam there. At the column, the beam is attached via a 3/4" thick cap plate with 4-3/4" bolts. I'm trying to confirm the adequacy of the beam to column connection. Is it...
