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Jmiec, after my inital post I tried out the model this way and I think this gives the most accurate representation of what is actually happening. My model is 2-d so I have the roof frame with 2x6 columns (the wall studs) supporting it on each end, with the columns fixed at the base. Under this...

The rafters as they exist right now are overtsressed in bending due to the tension reaction from the collar tie (since there are no ceiling joists). The collar itself is not overstressed and if I sister the joists they will no longer be overstressed either. I am not so much concerned with how...

I have been looking at a one story addition to a house that was built without a structural engineer and is now having problems. The addition is conventional wood light framed construction with 9' 2x6 walls supporting 2x10 rafters at a 4:12 pitch over a total building width of 28'. The rafters...

DGA stands for Dense Graded Aggregate. My understanding is that this material consists of range of particles ranging from about 1" down to dust-sized. That's really all I know about DGA. The site is in Central New Jersey. As far as the elimination of the vapor barrier goes, the owner, the...

I am structural engineer working on a new supermarket project. The client is particularly concerned about curling of the concrete slab on grade. Originally, we had specified a 3" sand layer below the 5" fiber-reinforced slab. Now, the client wants to change to a 4" slab on DGA material...

I am working on a project where we wish to detail 58' of 3"x3"x1/4" A36 steel plate welded to 8 stainless steel tube columns. I am not sure what grade the stainless steel will be because it will be part of a propreitary sunshade system that has not yet been selected. The architect has ruled out...