I just purchased a copy of Wind Loads: Guide to the Wind Load Provisions of ASCE 7-10 and I am going through it to more fully
understand the ASCE 7-10 wind load provisions.
A couple of things I noticed:
1. Table G5-13 on page 65, the negative signs for the coefficients
appear to be missing 2 thru 6E.
2. The last paragraph on page 65 states that "or 2.5h, whichever is
less." Shouldn't that height be the eave height at the windward wall
and not the mean roof height?
Also a general question on Note 8 of Fig. 28.4-1. It states "that if
negative then apply for a distance from the edge of the roof equal to
..." is this distance applied horizontally or along the slope of the
roof. As it is drawn in Fig. G5-7 it is along the slope.
However, if this is the case, when Zone 2 or Zone 2E is negative this
condition will always apply regardless of the eave height since the
distance along the slope of the roof will always be greater than half
the building width (unless of course the roof is flat). Was this the
intent of the code authors?
In regards to this same question if there is a roof overhang do you
measure from the building edge or the overhang edge for this distance?
I guess I should probably ask first if the envelope procedure is allowed
for buildings with overhangs, I assumed it does but I could be wrong.
understand the ASCE 7-10 wind load provisions.
A couple of things I noticed:
1. Table G5-13 on page 65, the negative signs for the coefficients
appear to be missing 2 thru 6E.
2. The last paragraph on page 65 states that "or 2.5h, whichever is
less." Shouldn't that height be the eave height at the windward wall
and not the mean roof height?
Also a general question on Note 8 of Fig. 28.4-1. It states "that if
negative then apply for a distance from the edge of the roof equal to
..." is this distance applied horizontally or along the slope of the
roof. As it is drawn in Fig. G5-7 it is along the slope.
However, if this is the case, when Zone 2 or Zone 2E is negative this
condition will always apply regardless of the eave height since the
distance along the slope of the roof will always be greater than half
the building width (unless of course the roof is flat). Was this the
intent of the code authors?
In regards to this same question if there is a roof overhang do you
measure from the building edge or the overhang edge for this distance?
I guess I should probably ask first if the envelope procedure is allowed
for buildings with overhangs, I assumed it does but I could be wrong.
