I call for levelling nuts to be used to allow the contractor more control in making everything plumb. As for the hole diameters, I only call for the sizes stipulated in the AISC code (US). I have worked with other engineers that used different sizes than the AISC chart; however, this chart...
The natural frequency will play a large part. I think it's td/Tn that will tell you what will happen with the member. If that ratio is over 0.5, then the maximum displacement will occur during loading; otherwise, the maximum deflection will be the same as the member rebounds, without damping...
I have had this problem several times before in dealing with City officials. The usual circumstance is that the City missed the fire requirement on the approved subdivision plat, or a new code was adopted after the subdivision was accepted by the City. If the code is the same, then the City is...