Need a book? Engineering books recommendations...

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

RE: UBC Eq. 30-1

[Subject Prev][Subject Next][Thread Prev][Thread Next]
E-sub-v is defined in the 1997 UBC as "an ADDITION ... to the dead load
effect."  SEAOC, as explained in the 1999 Blue Book, intended that E-sub-v
be applied in both vertical directions.  In other words, add E-sub-v for
most load combinations and subtract E-sub-v for "uplift" load combinations.

The 2000 IBC makes this clear.  The 2000 IBC also applies it to both
working stress design and strength design.  ASCE 7-02 will also apply the
vertical earthquake in both vertical directions for both working stress and
strength design.  ASCE 7-02 will be adopted by reference by the next
generation of IBC and NFPA Building Codes.

Regards,

Rick Drake, SE
Fluor Daniel, Aliso Viejo, CA

*********



                                                                                                                   
                    "Gerard Madden,                                                                                
                    PE"                  To:     <seaint(--nospam--at)seaint.org>                                               
                    <gmadden@attbi.                                                                                
                    com>                 cc:                                                                       
                    09/11/02 01:40                                                                                 
                    PM                   Subject:     RE: UBC Eq. 30-1                                             
                    Please respond                                                                                 
                    to seaint                                                                                ..... 
                                                                                                                   
                                                                                                                   




Ev is only used in non-working stress design. It is a reduction factor
for dead lead and acts Upward. SO combine this term with your DL and
you'll get something smaller than 0.9D in your load combo.

-gerard
Santa Clara, CA

-----Original Message-----
From: RainCat1(--nospam--at)aol.com [mailto:RainCat1(--nospam--at)aol.com]
Sent: Wednesday, September 11, 2002 1:18 PM
To: seaint(--nospam--at)seaint.org
Subject: UBC Eq. 30-1

In the UBC Eq. 30-1 E=rhoEh + Ev, what is the direction for Ev?
Are we suppose to combine numerically the expressions rhoEh & Ev?
Thanks!

******* ****** ******* ******** ******* ******* ******* ***
*   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
******* ****** ****** ****** ******* ****** ****** ********


******* ****** ******* ******** ******* ******* ******* ***
*   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
******* ****** ****** ****** ******* ****** ****** ********





-----------------------------------------------------------------------------------------------------
The information transmitted is intended only for the person
or entity to which it is addressed and may contain confidential
and/or privileged material. If you are not the intended recipient 
of this message you are hereby notified that any use, review,
retransmission, dissemination, distribution, reproduction or any
action taken in reliance upon this message is prohibited. If you 
received this in error, please contact the sender and delete the 
material from any computer.  Any views expressed in this message
are those of the individual sender and may not necessarily reflect 
the views of the company.  
-------------------------------------------------------------------------------------------------------


******* ****** ******* ******** ******* ******* ******* ***
*   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 
******* ****** ****** ****** ******* ****** ****** ********