huangyhg

help on flitch plate details
installing flitchs on existing exposed basement beam to remove one lally column. resulting beam will span 13'6" c to c from another lally to outside concrete wall (3" deep pocket available in foundation). existing beam is triple 2x8s, but outer ones terminate over lally to be removed so are useless. i am calculating 2- 1/2"x 7" plates to carry uniform floor load only (no wall above) of 600 plf, counting three 2x8s (one of three existing plus one each side of flitchs). questions are:
1. planning to put 3/4" bolts 24" o.c. staggered t&b (so bolts along top are 48" apart, ditto on bottom, but staggered). also putting two bolts each end. is this pattern, spacing and bolt size correct? not sure how to evaluate except looking at other flitchs.
2. to put the flitch and outside 2x8s into the 3" deep foundation pocket, i cannot get bolts closer than 5" from that end, and only 2" from max shear point (edge of concrete pocket). is this too far from the end or too close to shear point?
3. end bolts over lally on other end will be over center line of lally...ok?
4. because there are already 3 2x8s, the flitches will be over the very edge (slightly overhanging) the top lally plate, but will have the three center 2x8s bearing fully on plate. outside 2x8s will not be over plate at all. ok?
i am very grateful for any help with these details. the devil is always in the details. thanks.

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