Leaderboard

There are detailing requirements for seismic that require you do a 180 degree tie as they don't open up during earthquake- usually done for stirrups and ties. The requirement varies from code to code based on seismic classification. Standard 90 degree hooks are generally provided for longitudinal bars. Now, with regards to your questions. The drawing should clearly state where it is A or where it is G. There are different lengths because the diameter of the bar around which the bar that is being turned could change this length.My guess.