Need a book? Engineering books recommendations...

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

RE: shear wall program

[Subject Prev][Subject Next][Thread Prev][Thread Next]
"The 20% increase in base shear is a good investment as far as I am
concerned anyway for buildings in high seismic areas."

What increase is this?

Jason


-----Original Message-----
From: chuck utzman [mailto:chuckuc(--nospam--at)pacbell.net] 
Sent: Monday, March 12, 2007 1:53 PM
To: seaint(--nospam--at)seaint.org
Subject: Re: shear wall program

What he said.
Chuck Utzman, PE

Alexander (Sasha) Itsekson wrote:
> I bought Woodworks late last year and just started using there
Shearwall
> module.  I find this program very raw and cumbersome unless you are
> designing boxy buildings with well defined geometry and with bunch of
> shear walls at all elevations in low seismic zone.  When was the last
> time you have see a building like that?
>
> My gripes are as follows:
>
> 1.  There is no way to specify a split level or a hillside building.
> Each story height for all building blocks have to be the same.
> 2.  There is no way to specify a super stiff wall like a concrete wall
> or a foundation to trick the program to consider hillside
construction.
> 3. There is no easy way to specify a particular wall with less than
2:1
> ratio (such as proprietary wall or a shear wall pier with straps and
> blocking at the head and sill).  If you choose to ignore the h/w ratio
> it does for all the walls on all the lines of resistance which gives
you
> wrong results.
> 4. There is an option to specify the walls rigidity, but you have to
> specify them for all stories and all wall lines.  Doesn't that defeat
> the purpose for using this software in the first place? Why not to
allow
> for a custom wall or a custom rigidity for just one wall line and
> calculate the rest by default?
> 5. Since the rigidity is estimated based on the wall capacity how do
you
> estimate the rigidity of the steel moment or a braced frame?
> 6.  The interface is very difficult to navigate and they use the old
> Winhelp32.dll which is useless in Windows Vista for viewing their
online
> help.
> 7.  There are no examples in their online guide.  Following the online
> guide when using software for the first time is difficult.
> 8. For a fairly simple 2 story building I got 28 pages of output vs. 4
> to 5 pages of my spreadsheet. Man, it feels like garbage in - garbage
> out.
>
> This software is going back if they take it back from me and I am
going
> back to using my old trusted spreadsheets.  The simplified base shear
> calculation is a much earlier option to use rather than doing a rigid
> diaphragm analysis using dubious shear wall stiffness assumptions.
The
> 20% increase in base shear is a good investment as far as I am
concerned
> anyway for buildings in high seismic areas.  The rigid diaphragm
> analysis will have to wait until there is an easy and accurate
software
> to do it.  If I have to do it, I'd rather do it by hand or on Xcell
> where I feel that the results are accurate.
>
>
> Alexander (Sasha) Itsekson, SE
> Enginious Structures, Inc.
> Oakland, CA
> 510.601.1646
> www.Enginious-Structures.com
>
>
> ******* ****** ******* ******** ******* ******* ******* ***
> *   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 
******* ****** ****** ****** ******* ****** ****** ******** 

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