Beam Help?

[ovrszd]

I say this with love and respect for engineers, but you guys wear me out!!! This is obviously a simple pole building design to be covered with metal siding based on his quotes and drawing. I'm afraid the "engineer" solution to this guy's question will cost more than the rest of the building. But,,,, with that said,,,,, everything has it's time and place,,,, including over building at over cost production.

 

[randy41]

the right way to do this is to compute the actual load and then to refer to a span table.

 

[Timber]

Well do it right the 1st time and do it once, There is a thread in this group somewhere I read recently that broke my heart where a Microburst took out this guys antique barn. The fear of dead livestock or an old car you managed to hold onto as a kid or just the loss of equipment and the building. There are a lot of reasons to build correctly; this is why there are building codes.

 

[Paddy]

How would an engineers solution cost more? The tables at any lumber yard, (engineering based) use the lowest cost method of getting the job done safely. There is no charge for this solution. Guessing can result in under built or expensive construction.

You may recall a while back in Chicago, an over head wood deck colapsed and many were hurt/killed. The main problem was the keg of beer. Not due to the weight of the keg, but the weight of the danceing crowd waiting for another 'fill up'. often we don't think of maximum loading.

 

[mudcat]

Sorry for the poor sketch. I will try to clear it up. The beam in question will not be suporting the roof, just the exterior wall above it.The wall section over the beam will be three double 2x6. One in the center, the others spaced 8' OC to the right and to the left. These will support purlins for attaching the metal siding. Honestly money is getting tight on this project. I have enough 2x10's and plywood to make a triple 2x10, plywood sandwich. Will this work? If so how do I go about proving it will work as I will have to submit drawings to the county. I have a couple of sketches are better than the first (although you can't read my notes).
Pic 1. Sketch of exsisting building
Pic 2. What I want to do

 

[Tim_in_IA]

mudcat,

who made the plans for the building? For something like this I could just go down to the local lumber store and show it to them and they'd tell me what I needed. Off hand it looks like a pole building and the trusses will pass the weight to the endwalls, not the wall you speak of. I don't know if you need to get a glue lamb or whatever but do to the span I wouldn't be happy with anything under a 2x12. A 2x10 laminate (nailing your extra together) may work though, just run it by someone local. They have your snow loads and other factors memorized by now I am sure.

 

[EddieWalker]

Mudcat,

If you need to pass code and it will be inspected, why not just ask the inspector for his help. Most inspectors are more than willing to share with you up front what they expect and if you aproach them for help, it's almost always given. I've also found that if you do it wrong and they call you on it, then things can get real nasty, real fast!!!

I'd think that three 2x10's with half inch plywood in between would be plenty strong, but it's not normal practice, so I'm just guessing.

One thing that did just jump out at me was your design for your roof truss. It looks like a scissor truss, but it's all wrong. Are you having them made from a company and just drew them wrong? From what little I know about it, if you build your truss like it's drawn, it will come apart.

Eddie

 

[mudcat]

They seem to be standing up pretty good to me.

 

[schmism]

you guys crack me up!

so who actually has access to beam softwere?

(Schmism raises his hand)

ok guys check it out. (i work for ALpine engineered products and provide engineering services to the truss induistry)

so on a structual gable end (non weight bearing) then the header has to hold pu the sheathing above it. (all roof load is carred by the last stuctual truss)

so at 5psf * ~8' tall = 40PLF on the top of the header.

punch that in the puter and it says a 2ply SP#2 2x8 will work fine.

Technically speaking loaded to 62% capacity with a .66" deflection from dead load at mid pannel and .72" total load (with addtional live load) or L/328 dead L/295 total which exceeds the 480L/240T default defection crytieria

see http://www.snjschmidt.com/pics/header1.jpg for a pic of the actuall computer output

so at min i would use a 2ply SP#2 2x8 beam. Any addtional size will make the beam stiffer and still work.

PS although i dont want to get bombarded with 8million requests i can run any shape, size, loading etc beam or truss configureation you can come up with with any kind of material including TGI's for beams and LVL for both trusses and beams.

(yes i have access to fun toys)

 

[mudcat]

Steve, you are the man!!!!! And that's for schmism.