Return to index: [Subject] [Thread] [Date] [Author]

Re: Input with regard to section 1633.2.4

[Subject Prev][Subject Next][Thread Prev][Thread Next]
In a message dated 7/18/00 9:27:48 AM Pacific Daylight Time, 
Ben.Yousefi(--nospam--at)ci.sj.ca.us writes:

<< The difficulty is with applying the deformation compatibility to columns in
 a one-story building. Columns are usually designed and detailed with pin-pin
 end conditions.>>
What does it have to do with the number of stories if the columns are pin-pin 
at each story?

<< Unless you have a fixed based, applying p-delta to these
 columns is an exercise in futility.
 
 Ben Yousefi, SE
 San Jose, CA >>

Your are looking at it as a textbook pin-pin column. You don't need fixity to 
accomplish this. The columns are laterally stayed by the top and bottom 
diaphragms, despite the displacement, so your p-delta moment is resisted by 
the top and bottom diaphragm reactions. So the column is not going anywhere, 
except the Delta distance. I guess it's an exercise of 
principals-of-mechanics judgment rather than futility, depends who's doing it.

Oshin Tosounian, S.E.
Los Angeles, CA

******* ****** ******* ******** ******* ******* ******* *** 
*   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) to the list, send email to 
*   admin(--nospam--at)seaint.org and in the body of the message type 
*   "join seaint" (no quotes). To Unsubscribe, send email 
*   to admin(--nospam--at)seaint.org and in the body of the message 
*   type "leave seaint" (no quotes). For questions, send 
*   email 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 
******* ****** ****** ****** ******* ****** ****** ********