Development of a Field Method to Measure Out-of-Flatness of Structural Steel Plates.

摘要

The out-of-flatness of structural steel plates in bolted connections can prevent desired bolt tensions from being achieved, even when specified installation procedures are used. A bolt in a connection of out-of-flat plate elements will have a unique bolt-loosening response because of its relative position in the connection and its tightening order. Bolts tensioned adequately may lose a significant portion of their tension as the joint is completed, particularly those tightened early in the sequence. In order to correlate the out-of-flatness of structural steel plates and its bolt-loosening effect, an efficient and accurate means of field measuring out-of-flatness is required. The purpose of this thesis is to detail and demonstrate the devices and methodology to field measure surface profiles of structural steel plates, like the webs and flanges of plate girders.