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The first interpretation is correct. Each story-length of column is treated as a unique element. In this case, the first story column supports two floors and the second story does not. -- Ronald Hamburger, SE Consulting Principal Simpson Gumpertz & Heger --
have a technical question about provision 4.7.3 in ASCE 7-22 (see provision below). "4.7.3 Heavy Live Loads Live loads that exceed 100 lb/ft2 (4.79 kN/m2) shall not be reduced. EXCEPTION: Live loads for members supporting two or more floors are permitted to be reduced by a maximum of 20%,...
In ASCE 7-22 Ch 30 Part 2 they state that it's applicable to Mansard roofs; however, in table 30.4-1 no indication is provide as to what figure to follow for mansard roofs. I can't find any figure that relates to mansard roofs. Anyone know if this was an oversight, or if we are intended to...
Thank you Ronald for the reply. Very helpful.
You are correct that ASCE 7 does not directly address the issue. I have been engaged in projects that successfully developed such structures, where the lower, higher risk category structure was designed for one Risk Category (say RC III) and the supported structure for a lower category (say RC...
ASCE 7-22 Cl. 1.5.2 addresses buildings with independent structural systems with multiple Risk Categories. It also states that if portions of a higher Risk Category area pass through a lower Risk Category area and depend on structural elements within the lower Risk Category area, that those...
Does ASCE7-22 Chapter 15 apply to modular concrete gravity walls? It mentions cantilever walls and shows a mortared brick wall in the C15 section. It looks more like it is addresses fences and simple barriers. Each block in our wall is 2.5'x2.5'x5' and are 4,000lbs each with no mortar just...