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Repost: Main Wind Force Resisting System: IBC table 1609.6.2.1(1)/ASCE 7-98[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: <Seaint(--nospam--at)seaint.org>
- Subject: Repost: Main Wind Force Resisting System: IBC table 1609.6.2.1(1)/ASCE 7-98
- From: "Hood, Matthew O." <HoodMO(--nospam--at)ci.anchorage.ak.us>
- Date: Thu, 20 May 2004 11:36:00 -0800
Title: Main Wind Force Resisting System: IBC table 1609.6.2.1(1)/ASCE 7-98
This is a repost. It looks like the original message may not have gone through.
Any comments would be appreciated
Dear Seaint: I welcome your comments on why the transverse horizontal wind pressures on walls for MWFRS in the 2000 IBC table 1609.6.2.1(1) increase from roof angles (0 - 5) degrees to 20 degrees and then decrease from 20 degrees to (30< angle <= 45) degrees. For example: 110 mph, transverse horizontal pressures on wall at the end zone and the interior zone are:
wall (psf) IZ wall (psf)
Similar trends are observed for vertical loads as well. Is this an effect of the leeward pressure? Is there any data available for review regarding a model showing how the pressures behave at different wind velocities with various roof angles?
In the ASCE 7-98, figure 6-4, CASE A loading has a similar trend for the external pressure coefficients. While the interior zone external pressure coefficients (GCsub pf) trend increases in building surface 1 (windward side), it decreases and then increases in building surface 4 (leeward side). But it doesn’t appear to be the case at the end zone (see 1E and 4E for case A loading), however.
Thank you in advance for any comments…Martin up in Anchorage…have a great evening!
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