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Old 06-15-2013, 04:16 PM   #16
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Building Garage with Engineered Trusses


Don't mean to nit-pick, but I honestly hope you are more careful with your calculations than you were with the proof-reading on that website.

I know you must have had the best of intentions, but a 5th grade teacher would tear you up on the mistakes and typos in that presentation.

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Old 06-28-2013, 04:31 PM   #17
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Building Garage with Engineered Trusses


With a little help from a text called "Design of Wood Structures" by Donald E. Breyer and a recently purchased copy of the NDS 2012, the equations in TPI 1-2007 finally made a lot more sense (I was having some confusion with the bending effective length vs. the buckling effective lengths, combined bending and axial compression). I will say this has been quite an education with regards to structural design of wood structures. Last night I finally completed the full lumber analysis for the fink truss. Top and Bottom chords as well as all the webs. Now its time to start working on the heel joint check and all of the connector plates. Wind loads might be next but I need to research this quite a bit more.

After doing some reading on trusses it seems that the simplified method of calculating moments should be fine for statically determinate common trusses such as a fink, howe, king or double fink truss. Its when you start trying to analyze the statically indeterminate variety (ie. attic trusses) then the simplified method really comes up short. For that I will need RISA integration with the app.
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Old 06-28-2013, 05:03 PM   #18
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Building Garage with Engineered Trusses


Medeek...... Wish I could contribute... but basically it's over my head.... but darn interesting from a conceptual standpoint... to see just some of the calcs that go into a truss design.

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Old 06-28-2013, 05:36 PM   #19
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Building Garage with Engineered Trusses


Actually it was a bit over my head initially when I first cracked open my copy of the TPI standard. I've never done a whole lot of structural engineering of wood so I had to become familiar with the equations and the process. However, once you step through it, member by member it does actually all make sense. My observations after digesting the bulk of the NDS manual is that wood engineering is all about "factors", loads and effective lengths. Then it is just a matter of plugging these factors and a few variables into the corrects equations for the given application and you either have a go or a no-go, its actually pretty simple.

With trusses, as is the same with beams and columns you make some assumptions then apply a number of checks in order to specify the lumber type and size. You start with a given lumber type/grade and then work your way up until it meets or exceeds all of the checks.

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