181123-2011 EST
Ravwnvalor:
You need to take some classes in mechanical engineering. It is unfortunate that no one ever told you about beams and hole locations. The same theory applies for any type of materiql in a beam.
If you mechanically load a beam, then you produces forces within the beam that vary in magnitude that are a function of how the beam is supported, loaded, shaped, and other factors.
In a beam the greatest internal forces are at outer surfaces relative to the direction of bending, and zero at some midway point. Strength of materials are measured by force per unit area.
"I" beams exist because the greatest stress is at the outer surfaces, and the weight and material for a given structural capability can be minimized by putting the material at the outer surfaces.
If you drill holes near the edge of a bean, then you greatly weaken the beam.
Analysis of a beam has everthing to do with torque (moments). Drill holes in the center.
I don't think a mechanical engineer should OK what you have done. I don't know what you may be required to do to correct your mistake. It will greatly relate to the specfific structure.
Cut lumber beams are rectangles because this is the most economical approach. Steel "I" beams are easy to roll into a useful mechanical shape. Steel is hot rolled anyway so a special shape is no great problem.
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