Contact US

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!

*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

ASCE 7-10, MWFRS Wall Loads on OPEN building?

ASCE 7-10, MWFRS Wall Loads on OPEN building?

ASCE 7-10, MWFRS Wall Loads on OPEN building?

This may seem like an oxymoron (wall wind loads on an open building), but sometimes this can occur.
I would like to understand which equations to use for elements and system using for MWFRS?
(btw, I'm using Directional - Part 1)

Section 27.4.3 "Open Buildings with ..." sounds like the right approach, but when I review equation (27.4-3) it appears to be aimed at ROOF pressures (due to the use of qh, not qz; & the CN coefficient appears to revolve around roof geometry exclusively)

Section 27.4.1 "Enclosed & Partially Enclosed.."'s equation of (27.4-1) seems like it would make more since once the internal pressure portions are omitted. However the NAME of the section doesn't seem to be supportive of this approach AND the table I would use to derive Cp (Figure 27.4-1) denotes "Enclosed, Partially Enclosed Buildings" (no love for Open structures?).

I've searched around the forum and seems like some designers using the minimum design wind loads (section 27.4.7) but that seems like a cheap way out.


RE: ASCE 7-10, MWFRS Wall Loads on OPEN building?

I would tend to use free-standing wall loads. I don't know what table/section this is in ASCE 7-10, but was 6.5.14/Figure 6-20 in ASCE 7-05.

RE: ASCE 7-10, MWFRS Wall Loads on OPEN building?

ASCE 7-10 Section 27.4.3 indicates that for walls that could be deemed "fascia panels", which I take to mean partial height walls suspended from the roof plane as opposed to running from ground to eave, should be considered as an inverted parapet, i.e., use parapet loadings with forces on both the front and the back of each wall. (See Section 27.4.5)

RE: ASCE 7-10, MWFRS Wall Loads on OPEN building?

Great feedback guys.

Mark, your method/model makes sense. However, I feel the thin/planar sign may not develop the same leeward forces as the depth of a full building.

ajh1, I like your method too. I like that its at least mentioned within the body of a section where this formula should be noted. I think its sad on ASCE's behalf that we have to "reason-out" this approach. much like the sign model, I'm not sure the planar volume of a parapet is quite like a building's? However, I think I'll run with this method. I think I'll tweak the formula for parapets a bit. Instead of using qp (at the TOP of the parapet), I'll evaluate the full height and figure the differing pressures using qh.

I'm writing an excel worksheet for winds of ASCE 7-10. think i'll compare the pressures derived from this varying height parapet method vs. the typical Enclosed formula (eq.27.4-2) while omitting the internal pressure portions (as i mentioned in the orig post). see what happens...?

not closing this post -- still open to feedback!

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! Already a Member? Login


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close