ASCE 7-05 pressure coefficients
ASCE 7-05 pressure coefficients
(OP)
It is unclear to me when figuring uplift pressures around the perimeter of a roof how to sum the overhang and the distance "a" together. I'm looking at Figures 6-11B, 6-11C, and 6-11D.
Is "a" calculated from edge of roof line or wall line of building? In other words, if my distance "a" is 6' and I have a 2' overhang, can I use the coefficient for the overhang for 2' and the coefficient for zone 2 or zone 3 for 4'? Or.....do the overhang pressures need to be summed with the full pressures over the "a" distance from wall line in?
I'm probably talking in circles. I'd appreciate some input.
Thanks.
Is "a" calculated from edge of roof line or wall line of building? In other words, if my distance "a" is 6' and I have a 2' overhang, can I use the coefficient for the overhang for 2' and the coefficient for zone 2 or zone 3 for 4'? Or.....do the overhang pressures need to be summed with the full pressures over the "a" distance from wall line in?
I'm probably talking in circles. I'd appreciate some input.
Thanks.






RE: ASCE 7-05 pressure coefficients
RE: ASCE 7-05 pressure coefficients
RE: ASCE 7-05 pressure coefficients
Based on this, you can map out your correct zones on the roof and determine the correct GCp to use. You would use the overhang coefficient table only on the overhang part. Therefore it is possible for a zone to use different coefficients (1 from each table) if it occurred on both the overhang and the roof.