As a career metal building engineer I am fairly ignorant of the requirements of ACI. However, recently we have had a couple instances where our standard 4"x4" anchor bolt pattern has been rejected where we have specified 1 1/4" dia anchor bolts. We were referred to section D.8.1 of ACI 318 as...
An erector is asking whether it is acceptable to use turn-of-the-nut method to achieve full pre-tensioning of the bolts where there is an uncompressed DTI washer installed at the bolt.
My answer was that turn-of-the-nut is not applicable because the uncompressed DTI washer tells us that full...
As a manufacturer of metal buildings, we provide roof curbs as a building component for framed openings and mechanical units generally based solely on dimensional data. Periodically we are fortunate enough to actually receive the unit model numbers after prodding our customers.
Note...
Our company has provided a moment connection design using the minimum offset for entering and tightening clearances at 1 1/4" diameter bolts (1 11/16" side clears per pg 4-137 of the 1989 AISC ASD manual).
Lo and behold - the erector cannot complete full pre-tensioning of these bolts using...
