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[SEAOC] Re: [SEAOC] Truss Discussion[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaoc(--nospam--at)power.net
- Subject: [SEAOC] Re: [SEAOC] Truss Discussion
- From: Frank Woeste <fwoeste(--nospam--at)vt.edu>
- Date: Tue, 27 Aug 1996 15:39:02 +0600
What is lumber "hi-grading"? Frank Woeste, Professor of Wood Construction & Engr. At 09:36 AM 8/27/96 -0700, you wrote: >Here's my 3 cents, which is based on my experience here in the >Northwest where we have some snow and don't want to here about >earthquakes! > We have numerous truss manufacturors, which more often than not are >the local lumber yard in the larger towns. >They purchase truss plates and engineering from almost every state, >indcluding those that do not use the UBC, and >those where seismic and snow loading are not normal design >considerations, which is OK if the engineer >understands and knows how to include loads from those forces in >his(her) calc's. > In the course of three school projects I assumed(We all know that >assumptions can be the mothers of many bad things...) >that a truss plate engineer(manuf truss engineer) in a state thaT HAS >BOTH SEISMIC & SNOW LOADs would properly address them. >Part of my assumption was that some plan and elevation drawings were in >the engineer's possession. After rejecting the shop drawings and >calculations 3 times for ommissions and missing snow drift loads I >finally asked if the engineer had the drawings showing the roof offsets >in order to properly >compute the snow drift loads. I was told that they didn't and it was >not normal practice to have them! The engineer relied on information >provided by the >manufacturor!! I asked if the manufacturor's rep was an engineer and >was told,NO!! I copied the pertinant drawings and the current UBC snow >drift sections with the local state amendments and sent them to the >truss engineer and finally recieved, acceptable shop drawings and calcs. >The rest of the story is that my request for additional compensation >was rejected by the national engineering company doing the construction >management ! >I have also seen lumber "hi grading" but will spare you that account >until later. > >Norb Volny > >... > > ...
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