Yes, centers can't deviate for those below.
Scenario: 1st column is out of plumb my 1/2 inch, that's acceptable. Next column up is also out by 1/2 inch in same direction, that column by itself would be acceptable but the total top to bottom of the combined two columns is now out from vertical center line by a 1 inch - not acceptable. Pull the top back to center line direction an inch. Column is now out of plumb by acceptable 1/2 inch and also back to vertical center.
Reflectorless can get you the answers you need.
@dougie No.
I guess in some theoretical scenario with the right load, the column could flex, but in the real world, no. A collapse's would occur at the joints.
Imagine stacking two unsharpened pencils on top of each other. Perfectly balanced, but you theoretically could do it. That column wouldn't collapse from a load on the top, but from some sideward force and would collapse at the point where the two pencils meet.
A couple years back I had a job on a 12 story building in downtown PDX. My part was to double check the contractors staff surveyor. The contractors surveyor set stickers at rooftop level on adjacent 5 story buildings. He was resecting to them. We set our control at ground level, and tied the stickers to it. Our work was done in the first week of August with the temperatures in the 90?ø's.
The ground level work went fine, with us agreeing with the contractor's man. No problem.?ÿ By the time we came to do the second floor it was October and we were no longer agreeing.?ÿ By November I undertook to check all control, including the stickers. As before, I tied all the stickers from multiple instrument points on the ground and LS analysed. We found that the ground control was as tight as ever, and the stickers were tight relative to one another, but that stickers were now around 0.08' different relative to the ground. We regularly spot checked those things thereafter, and found that they would drift around some. The building topped out before the heat of the next summer.?ÿ
So yes, even finished buildings will move from temperature alone. Add the stresses on a building under construction, then even more so.?ÿ ?ÿ ?ÿ ?ÿ?ÿ
