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OCR for page 15
16 the erector initially install enough crossframes to ensure the UNANTICIPATED DISTORTION stability under wind loads of the erected girder, before erect- ing subsequent girders. One erector believes that the use of undersized bolts will sometimes help in making the initial connections. However, Other owners reported bridge-specific solutions used when slotted connections do not seem to be the answer when dis- problems arose with no change in their general requirements. tortion results from loss of geometry control.