After finally completing the addition and building a few other projects, it seems the time is right to build a shop in the basement beneath the family room to store the leftovers. But I need to remove a column in the middle of this floor. There are no supporting walls on the floor above the basement. The floor (plywood subfloor, 1/4" Hardy board underlayment, Doug fir flooring + radiant heat tubing) is supported by simple construction 2x10 floor joists hung off three sistered 1 3/4 x 9 1/2 microlam beams. One end of the carrying beam is on the sill, the other on a column where it meets the chimney. It cannot be lifted without risk to the granite hearth above this end. A third column, the one to be removed, is in the middle. The combined floor expanse of 2x10's is 24' and the support beam itself is 15' long. There is a good chance the center microlam of the three is actually two parts laid end to end at the center column, while the outer microlams are continuous. I want to through bolt the three microlams along the middle third of the 9 1/2 width in each bay. It cannot be sistered due to the joist hangers as described. The table saw has to live somewhere! I have tried the tables and not sure I am reading them right. It appears three 9 1/2's is marginal at 12' let alone 15'. I could add a short knee at either end to reduce the length to 9' but would rather not. Is there a knee that attaches to a lolly column? Can I get away with just through bolting?