Lately I've been running into issues with my lateral analysis on a large, square steel framed building. The roof is an 1-1/2" metal deck that slopes in one direction and drops 10' over the length of the building, which I've modeled as a semirigid diaphragm…

I'm using RAM SS to design a building where we have raised slabs modeled due to a bridge framing into the building. I'm wondering if there are any special requirements in order to have RAM use the main floor diaphragms to calculate the tributary heights…