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RE: shear wall program

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I used Woodworks a good deal in my last job.  It was an excellent
program that saved a lot of time, so long as the building is simple.  I
like that program, and have advocated purchasing it for use on simple
rectangular structures, you really can't beat it if the structure is a
box.

Modeling a structure with interior bearing walls, joist layouts that are
not rectangular, an oddball roof, and building irregularities was pretty
difficult.  It generated a great deal of errors and didn't always
properly transfer wall weight to the joists.  You have to be observant
in checking the bottom layer to make sure that woodworks picked up point
loads and wall loads from above.  It can be done, but it would be nice
if you could simply draw the joist layout and have the program pick it
up within there.

I have not used Woodworks in about a year, the new firm I work for does
most of this by hand.  Have these issues since been resolved?  I would
buy it myself for my own use if it was more tolerant of non-rectangular
structures...

Will Blanchard
BSCE / EIT
will(--nospam--at)strucdes.com
 
Structural Design Associates
(425) 339-0293

-----Original Message-----
From: Robert Jonkman [mailto:rjonkman(--nospam--at)cwc.ca] 
Sent: Thursday, March 08, 2007 11:40 AM
To: seaint(--nospam--at)seaint.org
Subject: shear wall program 

Andy:

As the manager of the WoodWorks software development (CWC with tech
support from AWC), I can offer the following:

WoodWorks Design Office, which includes a Shearwalls design module,
distributes automatically generated ASCE7 or UBC seismic and wind loads
by flexible and rigid diaphragm methods, and also designs both
perforated and segmented shearwalls, based on NDS 2005.  Engineers tell
me that the interface is simple to use, and within a day the basics of
using the software are learned, so the return on this investment of time
is paid off in one or two projects.  

The process of modeling your structure is quite simple:  Either starting
from scratch or by importing up to 6 levels of AutoCAD saved Windows
Meta File (.wmf) plans view(s) of your structure to use as a template,
draw blocks where your walls will be, and draw window and door openings
using the wmf as a guide.  For 3-4 storey apartment buildings with
similar layouts and window configurations, you will appreciate the
software's ability to copy the first level layout including openings to
all floors above.  Next, place a roof with overhangs over the structure
(gable, hip, flat, or combined), select the appropriate seismic and wind
properties such as R, Soil Class and wind speed, topographic
characteristics etc), and hit the "generate loads" button.  After
running the program, tables are generated for quick reference of loads
and design, pass/fail etc, and each shearwall can be viewed and printed
with a summary of the nailing, sheathing thickness etc below it. 

The software does not calculate shearwall deflections.  By default for
rigid diaphragm analysis WoodWorks® approximates the "rigidity" of each
shearline with its "capacity", or strength x length, instead of using
deflection to calculate the actual rigidity.  Using this capacity method
requires less time for the users to enter data especially regarding
chord slip and nail slip components of the deflection formula in the
NDS/IBC and is recognized as a legitimate alternative in the 2000 IBC
Structural/Seismic Design Manual - Volume 2, p67, Published by
Structural Engineers Association of California (SEAOC) and edited by the
International Conference of Building Officials (ICBO).  That said we
still plan to add deflection in the future.

The software bases all the results on the applicable building codes and
standards, and has accurately been doing so for approximately 15 years.
I look forward to others opinions of the software either through this
forum or offline. 

Robert J. Jonkman, P.Eng.
Manager, Structural Engineering
Canadian Wood Council
Suite 400, 99 Bank Street
Ottawa, ON  K1P 6B9
Tel: 613-747-5544 ext 252
Toll Free: 800-463-5091 ext 252
Fax: 613-747-6264
email: rjonkman(--nospam--at)cwc.ca
 
Visit our website at:  www.cwc.ca
Wood Engineering Software:  www.woodworks-software.com

_____________________________________
I was just wondering if any one of you is familiar with the Woodworks
shear wall software. I need a program that can comply with the flexible
and rigid diaphragm requirements of the code and also provide me with
wall deflections.  I have several larger buildings to do in Los
Angeles,  and doing these calculations manually are rather time
consuming. This would be used on 3-4 story apartments with
mostly stacking units.  Does any one have any likes, dislikes or any
other recommendations.  How easy is it to learn to use, model, and how
accurate is the results?


 


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