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WesternJeb, I guess I just get hung up on using the diagonal brace as just a drag strut designed to over-strength because that would be like designing to an R of 1 for the brace which isn't allowed in buildings. In some cases, you can go down to an R of 1.25, but that's limited by SDC and...

WesternJeb, drag struts wouldn't usually play into if there is a horizontal or vertical irregularity, right? Isn't it usually dependent on the seismic resisting elements of the specified system? I would assume a vertical in-plane offset if it were a high brace offset from a low brace, but if...

This is a one story building with two roof heights; the high roof on this side of the building can't have a full height brace from high roof to floor because of architectural needs, so the load needs to transfer to the low roof. JAE, you recommend bracing at "each story," but if it isn't a...

Okay everybody, I did a quick search and couldn't find anything on it in the forums. If you have a high roof and a low roof, can you call the low roof X-brace the braced frame designed to SCBF and call the high roof diagonal just a drag strut / collector designed to the over-strength factor? I...

@KootK, send it my way and I'll make sure it's sent on to the proper parties. XD

Thanks for all the input everyone! We ended up working with them on analyzing the modal response of the structure as they see it versus the structure if there was a hill in the middle to verify the upper structure would act similarly in both cases, then allowed the analysis as they initially...

It is a PEMB, they wouldn't typically model any of it, but we asked questions and so they're enhancing their analysis in this case...

The moment frame above the mezzanine is only a single story, but the structure is two story. The exception to use an OMF in SDC D and above is for single story structures, hence trying to use the two-stage which would allow the "single story structure" to be the OMF's on the whole thing and then...

@driftlimiter, the problem is the limitation on an OMF in SDC D, it can only be used in a one-story structure.

That's what I'm wondering, the scope of an IRC building is pretty open-ended when it comes to shape and stories and little roofs. Can't tell if they assume the homeowner will go take care of a drift or not, haha.

Sorry for the long silence! I thought I'd get a notification of responses, but I'm new to using the forum. @Bones206 has it pretty close to correct. They're trying to say the frames above (including the end frame) are ordinary moment frames pinned at the mezzanine level. They then transfer...

Is there any reference to snow drifting in the IRC? I'm looking in 2018 and I haven't found a single reference. Is it not considered on these structures? How has the design been limited to avoid snow drifting? I don't know of any sections that require the roof structure to all be at the same...

I'm reviewing a design where the engineer is wanting to use two stage analysis to get out of loading the roof with seismic weight from the concrete topped mezzanine deck. The problem is the base for the upper structure is not all at one level. This doesn't seem like the right use of the two...