Methods to Reduce Built-in Residual Stresses in Steel Bridge Diaphragms (Phase I)

摘要

This investigation determined the magnitude and origin of residual stresses inplate girders, diaphragms and stiffeners built-in during construction. Residual stresses can contribute to crack formation. Three different steel bridges were studied: (1) a multi-girder bridge anchored at the abutments with no center pier; (2) a 4-span continuous multi-girder bridge with piers; (3) a movable, double-leaf bascule bridge. Bridges were instrumented with strain gages at the fabricator. Changes in reference strains were monitored: (1) after steel erection and bolt-up; (2) after deck placement; and (3) after parapet placement.