how to design wood beam with steel side plates?

[jpen2015]

I am trying to strengthen an existing 12" deep wood beam by adding 5.5" deep x 0.25" thick steel side plates. The steel plates can only be placed along the bottom of the beam. The steel plates are being added because the support system of the wood beam is being altered, so now the beam can no longer handle the bending and shear stress applied to it. The beam will be supported with new steel tube columns. I have never design a wood beam with steel side plates before. Can anyone point me to a good reference with design guidelines? I already have NDS design manual.

 

[jayrod12]

They won't be steel side plates if you can only add them to the bottom.

You would need to determine the fasteners required to transfer the interface shear.

For what it's worth, I'm not a huge fan of this. Why can't you reinforce the sides like normal?, or provide column capitals to retain the current support lengths.

 

[jpen2015]

I can't put the steel plate along the whole height of the wood beam because there are vertical steel angles located along the upper portion of the beam. The angles are attaching rafters to the beam. Column capitals wouldn't help because the layout of the walls is what changing. The location of the supports differ greatly.

 

[KootK]

This recent thread may be helpful: Link

I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.