Because of the potential for seismic activity, I want to secure a wood beam post (consisting of three 2 x 12s) to the bottom flange of a W-14x61. The wood beam post supports one side of the beam (beam and post butt up against the interior basement wall which is wood framing). The other end of the I-beam is secured to the foundation of the house. I fabricated an L-bracket out of 1/4" mild steel with bolt holes toward the wood beam post. A welding friend of mine said that he would weld the 2 longitudinal interfaces between the L-bracket and the I-beam but would not weld the remaining interface across the flange because it would cause the weld to crack due to expansion/contraction. Is this advice sound? Any other advice would be appreciated for this application
My advice to you is to get an engineer involved. So far nothing you've listed would fly as-is. Also, W14x61's are typically used as columns, not beams. As for the welds, I won't touch that one because I'm not the engineer of record. But my advice is to not do it, and get an engineer involved.
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Im trying to picture this and it seems that you are trying to hold up one end of the beam with and angle bolted to a wooden column is that right?
If you are, then thats not the proper way of handling the situation. What you have to do is get a structural engineer to draw up a shop drawing of your situation showing you the proper material, thicknesses and installation method.
What we have done in the past is:
1) Get approved shop drawings.
2) Dig for a concrete pad.
3) Used a 4 square column Ό thick with a top plate of 10 ½ x 10 ½ x ½ thick with a bottom plate 12 x 12 x ½ thick with 4 holes to except ½ anchors.
4) Weld (2) straps with holes to except nails of flat material 2 x 1/8 x 16 long to column and then nail it to your existing framing.