×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Breyer's, Wood Structures, 6th Ed.

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.

RE: Breyer's, Wood Structures, 6th Ed.

I'll take the bait on this one since both Breyer's text and ASCE are front and center on my desk. Zone 4 is interior wall and is referred to in ASCE 7 Fig 6-3. Obviously you need to look a little closer and you will find it. The 14.6 and 15.8 pressures are straight from Figure 6-3 for interior wall pressures.

Class dismissed....

RE: Breyer's, Wood Structures, 6th Ed.

(OP)
Yeah, that was a stupid question. I saw the answer right after I posted it. Duh. My bad. Sorry.

RE: Breyer's, Wood Structures, 6th Ed.

(OP)
The following are less stupid ?'s (hopefully). 1) On p2.71, he shows wc = 90 psf. He does not define wc, nor is it in Definitions, pxxv, nor xxvi. He merely equates wc to 90 psf, coincidently the same as the wind speed V, 90 mph. Is this a slight of the hand or is this conversion correct?
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.

I will try to answer these:

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.

(OP)
Good morning, 1) yes, I initially overlooked the identical weight of the wall. 2)Ok, 3)Thx for the note.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources