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<DIV>Thanks for all these detailed references, they are indeed valuable. </DIV>
<DIV> </DIV>
<DIV>But what I need is the actual use data and not the effect of using
metal bracing. I need the actual amount of steel being used by the contractors
in California thru the various seismic zones. So its more a matter of a survey
database rather then the actual physics. </DIV>
<DIV> </DIV>
<DIV>I guess I need to ask this question in a contractors or a structural
engineers forum...</DIV>
<DIV> </DIV>
<DIV>-Smita</DIV>
<DIV> </DIV>
<DIV><BR><BR>>>> "Ian Doebber" <idoebber@vt.edu> 09/01/04 03:58PM
>>><BR>Several scientists at Oak Ridge National Lab worked with
Enermodal to create<BR>ASHRAE Technical Committee 4.7 "Energy Calculations"
Report 1145 entitled<BR>"Modeling 2 and 3 Dimensional Heat Transfer through
Composite Wall and Roof<BR>Assemblies in Hourly Energy Simulation
Programs". It essentially covers the<BR>"Equivalent Wall Method" to
analyze the steady state performance (R-value)<BR>and transient performance of a
wall system and accurately model it in say<BR>DOE2.1 or Energy Plus which are
limited by their one dimensional conduction<BR>analysis for the building
envelope. If you are just interested in how the<BR>metal bracing decreases
the R-value, I would recommend "Thermal Breaking<BR>Systems for Metal Stud Walls
- Can Metal Stud Walls Perform as Well as Wood<BR>Stud Walls" by some of the
same researchers who worked with Energy Model on<BR>the 1145 report mentioned
above (Jan Kosny Jeffrey Christian Andre<BR>Desjarlais) This report covers
the effect of using metal studs mainly in<BR>residential applications but
concepts can be applied to other applications<BR>as well. Both these
publications use a Finite Difference program called<BR>"Heating" which is very
simple but robust to conduct heat transfer<BR>calculations for pretty intricate
wall assemblies. It does both steady<BR>state and transient
analyses. Hope this helps<BR><BR>Ian Doebber<BR>Virginia Tech<BR>Graduate
Student<BR><BR>----- Original Message ----- <BR>From: "Leo Rainer"
<lirainer@davisenergy.com><BR>To: <BLDG-SIM@gard.com><BR>Sent:
Tuesday, August 31, 2004 2:20 PM<BR>Subject: [BLDG-SIM] metal bracing in wood
construction<BR><BR><BR>> Smita,<BR>><BR>> I suggest you take a look at
the report that Enermodal did on residential<BR>> framing factors. The PIER
funded part of the study is at:<BR>> <A
href="http://www.energy.ca.gov/pier/buildings/projects/400-00-002-0.html">http://www.energy.ca.gov/pier/buildings/projects/400-00-002-0.html</A><BR>><BR>>
This is part of a national level study they did for ASHRAE. There
should<BR>be<BR>> some data in there on the effect of various types of
bracing.<BR>><BR>>
Regards,<BR>><BR>>
Leo Rainer<BR>> Senior
Engineer<BR>><BR>> At 03:20 PM 8/30/04, Smita Gupta wrote:<BR>>
>Hi,<BR>> ><BR>> >I was looking for some information regarding
the amount of metal bracing<BR>> >being used in wood stud wall
construction for seismic reasons in<BR>> >California. Wanted to estimate
the change in U-values becoz of the<BR>> >addition of steel to the wood
construction and its impact on the energy<BR>> >performance. Would
appreciate any references to source of such data,<BR>> >........and in the
lack of, any anecdotal evidence of how much steel does<BR>> >typically get
added to shear walls.<BR>> ><BR>> >Thanks a lot,<BR>>
><BR>> >Smita Gupta<BR>> >Energy Analyst, LEED AP<BR>>
><BR>> >Buildings & Appliances Office<BR>> >California Energy
Commission<BR>> >1516 Ninth St. MS 42<BR>> >Sacramento, CA
95814<BR>> >Phone: (916) 657-4034<BR>><BR>><BR>>
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