] [Thread] [Date] [Author]

[ad026(--nospam--at)hwcn.org (Paul Ransom)]

> From: "Dennis S. Wish, PE" <dennis.wish(--nospam--at)verizon.net>

> > Would someone point me to a reference for how to use wind-load
> > information to determine the moment of intertia required for a mullion,
> > assuming a normal rectangular mullion/muntin pattern?

> > John.

> With this said (I've never been asked to design one before so possibly
> those who work on taller buildings with curtain walls can respond) I would
> be more concerned with deflection of the mullion due to bending than
> whether or not ou are exceeding the allowable required moment of inertia
> of the material you use. The allowable deflection can be greater than what
> the glass needs to resist cracking or breaking. So stiffness is the most
> important issue here and how it ties into the material you use to create a
> mullion.

On the nose. I designed a support grid for a substantial glass wall. The
members were "large" for deflection considerations. The owner likes to
joke that the building will blow down but the windows will still be
standing.

To answer John's question. Any engineering statics text and ASCE 7 will
provide what you need.

-- 
R. Paul Ransom, P. Eng.
Civil/Structural/Project/International
Burlington, Ontario, Canada
<mailto:ado26(--nospam--at)hwcn.org> <http://www.hwcn.org/~ad026/civil.html>

******* ****** ******* ******** ******* ******* ******* ***
*   Read list FAQ at: http://www.seaint.org/list_FAQ.asp
* 
*   This email was sent to you via Structural Engineers 
*   Association of Southern California (SEAOSC) server. To 
*   subscribe (no fee) or UnSubscribe, please go to:
*
*   http://www.seaint.org/sealist1.asp
*
*   Questions to seaint-ad(--nospam--at)seaint.org. Remember, any email you 
*   send to the list is public domain and may be re-posted 
*   without your permission. Make sure you visit our web 
*   site at: http://www.seaint.org 
******* ****** ****** ****** ******* ****** ****** ********