The requirements described in this standard—which is a complete revision of ANSI A—are suitable for inclusion in building codes and other design. The first consensus wind load design criteria were published as ANSI A by the. American National Standard Institute (ANSI) in This document . The first consensus wind load design criteria were published as ANSI A by the American National Standard Institute (ANSI) in This document .
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ANSI A – Snow Loads – Structural engineering other technical topics – Eng-Tips
I am trying to find out how flat roof snow loads were determined and what provisions were in place if any to account for unbalanced snow loading. I believe that the ground snow was set at 25 psf at least in the Chicago area. I cannot find any copies of this old code so any help would be appreciated. If you are working on a building designed under the review of the Chicago Building Department they have there ani codes which are not derivative from any other code.
You will need to find a library which has older Code books available.
They don’t change their building codes very often but they generate them by themselves. I am attempting to review the design loads used on an older building designed in which was using ANSI A There are provisions for unbalanced loading in the version. Is there any way you could forward me 1 how flat roof snow anxi was determined?
I think that for the Chicago area the ground snow load was listed at 20psf amsi What were the unbalanced snow provisions for a hip roof? The UBC, although not used in the Chicago area, mentions the use of unbalanced loading for snow loads and roof live loads. Apparently this provision also existed in the UBC as the paragraph ani not alluded to as changed See Section and b.
Interesting to note though that in this code, by it’s own definition of live load Sectionsnow was considered a live load, different than what we view it now – it’s own separate load classification. I also noted in the a that there is an exception to the alternate span loading requirement that may or may not apply in Chicago – “Alternate span loading need not be considered where the uniform roof live load is 20 psf or more and the provisions of Section c are met.
Here are the snow portions of That is exactly what I was looking for.
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