Pretty common to splice all elements of a beam over a column. If you splice between columns, you need careful engineering of the connection to make sure the beam acts as a single unit. When you splice over a column, the beam does not carry any moment from one side of the column to the other, so all you have to worry about is adequate bearing and proper connection to make sure the column does not walk during an earthquake.

As to the hump, you need to see if the column is too high, and pushing up the beam, or perhaps there is a shim above the beam or below the beam that is causing the hump. If the column is too high, you may be able to temporarily support the beam, cut the column to proper length, and reattach. All depends on the design of the column. If you decide to adjust the column length, be VERY CAREFUL to use adequate temporary support, and make sure you do not lower the beam too much too quickly, as this can crack the beam. Probably best to get someone involved on site who has experience and capability in this type of work.

 

Chances are... not all 2x12's at the seam are exactly the same height, I have seen them vary within a half inch... I would take a saw zaw and shave the top of the beam directly under the high joist and then re-nail once the floor joist goes down.

 

The hump is from either the post rising or the ends sagging. If you want the hump gone you figure out has shifted.

 

or from the middle parts ofe the span on either side of the pally column dropping. You need to find out what is doing what before you go all sawzall on anything. Run a string from one end to the other and see what is going on. Ron

 

Okay so if your beam is sagging cut holes in your concrete floor, pour footings, jack it up, put in another stanchion post. Or Jack the beam up and get some lvls and sister them to the 2x12's

 

I highly dought the post is rising and this is the kind of stuff you get when you put a seam on a stanchion post. Stagger seems always!