ASCE 7-10 - Definition for "Partially Enclosed"
ASCE 7-10 - Definition for "Partially Enclosed"
(OP)
I've searched high and low (here and all points of the Google globe) but still not satisfied.
I pose a simple scenario:
A building that is 25'x25'x25'tall.
It has one opening in one wall that is 5 s.f.
According to the definition it IS "partially enclosed".
Ao = 5sf
Ag = 25x25 = 625sf
Aoi = 0sf (no other openings besides the one)
Agi = (the non-opened walls & roof) = 4x 25'x25' = 2500sf
The satisfying conditions:
Ao > 1.1Aoi = TRUE, 5 > 1.1x0
Ao > minimum of{4sf or 0.01Ag=0.01x625=6.25} = TRUE, 5 > 4
Aoi/Agi < 0.2 = TRUE, 0/2500 < 0.2
I can't believe the code implies this scenario would be partially enclosed. This scenario stays true (i.e. defined to be Partially Enclosed) when you enlarge the building but keep one opening just barely over 4 s.f. -- which seems even more ridiculous.
Maybe my math is off and/or I'm interpreting the walls/openings incorrectly.
Would appreciate some help on this.
Thanks,
I pose a simple scenario:
A building that is 25'x25'x25'tall.
It has one opening in one wall that is 5 s.f.
According to the definition it IS "partially enclosed".
Ao = 5sf
Ag = 25x25 = 625sf
Aoi = 0sf (no other openings besides the one)
Agi = (the non-opened walls & roof) = 4x 25'x25' = 2500sf
The satisfying conditions:
Ao > 1.1Aoi = TRUE, 5 > 1.1x0
Ao > minimum of{4sf or 0.01Ag=0.01x625=6.25} = TRUE, 5 > 4
Aoi/Agi < 0.2 = TRUE, 0/2500 < 0.2
I can't believe the code implies this scenario would be partially enclosed. This scenario stays true (i.e. defined to be Partially Enclosed) when you enlarge the building but keep one opening just barely over 4 s.f. -- which seems even more ridiculous.
Maybe my math is off and/or I'm interpreting the walls/openings incorrectly.
Would appreciate some help on this.
Thanks,






RE: ASCE 7-10 - Definition for "Partially Enclosed"
Another way to put it is; would you prefer a sliding scale for partially enclosed effects? That code is complicated enough without adding that.
RE: ASCE 7-10 - Definition for "Partially Enclosed"
As for sliding scales...
I try to make as many excel sheets to do my work as possible, so long equations only bother me once (when programming) -- after that, I don't mind.
As for my example:
I think the equations should involve a variable based on the VOLUME of the space -- afterall we are talking about the pressurized of a space. The wall areas already in the equations are closely related, but not directly (like a volume variable would provide). I dunno.
I'm less frustrated since I"m able to use the reduction factor, which can bring the 0.55 down to 0.275 (in some cases) -- thats WAY less of a jump from an fully enclosed factor of 0.18.
RE: ASCE 7-10 - Definition for "Partially Enclosed"
lets look at the definition of OPEN too and this simple scenario.
- An new structure that is an "open" canopy (ie. no walls) except that it has one face backed up against an existing fully clad building.
Definition of Open Building says "..EACH wall be at least 80% open".
The "wall"/face of the canopy structure that is adjacent to the existing building is NOT 80% open, thus the building is NOT open -- but intuitively you "know" its open.
thoughts?
RE: ASCE 7-10 - Definition for "Partially Enclosed"
RE: ASCE 7-10 - Definition for "Partially Enclosed"
RE: ASCE 7-10 - Definition for "Partially Enclosed"
RE: ASCE 7-10 - Definition for "Partially Enclosed"
Where did you find the "Reduction Factor for large volumes (section 26.11.1.1)?" There isn't a Section 26 in the ASCE 7-05 that I could find.
I'm running into a similar argument about partially-enclosed or not with a pre-engineered metal garage.
Thanks
RE: ASCE 7-10 - Definition for "Partially Enclosed"
RE: ASCE 7-10 - Definition for "Partially Enclosed"
RE: ASCE 7-10 - Definition for "Partially Enclosed"