ASCE7-05 wind loads on free standing wall
ASCE7-05 wind loads on free standing wall
(OP)
For a free standing wall ASCE7-05 gives 3 load cases: A, B, and C in Figure 6-20. I have a free standing CMU wall. In my way of thinking load cases A and B apply, but I do not believe C applies to a free standing wall on the ground. Primarily given the wind direction indicted in the Figure. C is intended to give a strong torsion for non orthogonal winds which makes since for elevated signs, but not walls IMO. For my wall it is the difference between 18 psf and 30 psf peak wind load.
What have others done for free standing walls?
What have others done for free standing walls?






RE: ASCE7-05 wind loads on free standing wall
RE: ASCE7-05 wind loads on free standing wall
RE: ASCE7-05 wind loads on free standing wall
Some municipalities (Clark County & Las Vegas, NV) have amended Case B & C out of the code for screen walls up to 10' high.
Southern Nevada 2012 IBC Amendments
RE: ASCE7-05 wind loads on free standing wall
That makes sense to me. I went through the exercise of Case B, and if I equate the eccentric load to a moment and back out a pressure from that I get an average pressure at one end in the ballpark of a Case C. So I guess I will go with B/C for my 7ft tall CMU wall.....oye
RE: ASCE7-05 wind loads on free standing wall
And (just for my curiosity) how are you breaking case B down into a pressure? When I do it for signs, I equate it to 5/3 x 'case a pressure' over 60% of the width of the sign. That yields the same eccentricity.
I've also found that on a sign, Case C yields similar total load eccentricities to Case B. Such as a single column supporting a sign the loads on the column are similar between case b & c.
RE: ASCE7-05 wind loads on free standing wall