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[SEAOC] Truss Discussion[Subject Prev][Subject Next][Thread Prev][Thread Next]
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- Subject: [SEAOC] Truss Discussion
- From: Volny_Engineering(--nospam--at)bendnet.com (Volny Engineering)
- Date: Tue, 27 Aug 1996 09:36:47 -0700
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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