Breyer's, Wood Structures, 6th Ed.
Breyer's, Wood Structures, 6th Ed.
(OP)
Good morning. On p2.40, Example 2.10, Wind Force, Components & Cladding, Wall Forces for regions b and c (Interior Zone 4) for effective wind area of 10 sf: Pnet30 = 14.6 psf and -15.8 psf.
Q1: There is no zone 4 in ASCE 7 Fig. 6-3.
Q2: Where does he get 14.6 and -15.8?
Ditto p2.41, Wall Forces for region d, 14.6 and -19.5? Thanks.
Q1: There is no zone 4 in ASCE 7 Fig. 6-3.
Q2: Where does he get 14.6 and -15.8?
Ditto p2.41, Wall Forces for region d, 14.6 and -19.5? Thanks.






RE: Breyer's, Wood Structures, 6th Ed.
Class dismissed....
RE: Breyer's, Wood Structures, 6th Ed.
RE: Breyer's, Wood Structures, 6th Ed.
2) At the btm of the page, he shows ap = 1 and Rp = 2.5, from ASCE 7, p 146, Table 13.5-1, maybe 3rd group fm the top, at Exterior Non-structural Walls. However, his Fig. 2.20 clearly shows the wall IS structural. So how can these Rp's be used?
3) Then on the following p, he must have used Rp = 1, to get the wu2 = 108 psf, because with Rp = 2.5, wu2 =43 psf. Did he hit the wrong button on his calculator?
RE: Breyer's, Wood Structures, 6th Ed.
1) I believe wc should read wp based upon the definition of wp on the previous page. The problem states that the brick wall weighs 90 psf so I think this is what was used in the calculation. I doubt the wind load would be used in this step as you are determining the diaphragm forces due to seismic loading.
2) I agree with the author on the use of the values of the variables given. This is a parapet wall with the bracing to the structure provided above the wall's center of gravity.
3) I would tend to agree with you that there is a typo and that wu2 should equal 43.2 psf
RE: Breyer's, Wood Structures, 6th Ed.