Diaphragm Connection Plates
See comments under Stiffeners in General
When diaphragm connection plates are misplaced by a large amount (more than 6"), it is usually acceptable to leave them in place, fill the holes with bolts, and add a new stiffener at the proper location. When diaphragm connection plates are off by a small amount, recommend making no repairs. The diaphragm will be not quite 90 degree to the girder, but it should still fit with no problems.
When holes are misplaced in a diaphragm connection plate or a bearing stiffener, it is usually easier to modify or re-make the diaphragm than it is to repair or replace the stiffener. This type of error can occur frequently, as it can be installed upside down, or a stiffener with the wrong piece mark can be installed. If a special diaphragm is made to fit specifically in this location, the shop drawing must be revised so that the erector is aware that there is a special diaphragm, and knows where it is to be located.
If a diaphragm is to be attached to a misplaced bearing stiffener, a check should be
made to insure that it will still fit when bolted to a misplaced bearing stiffener.