Steel curved I-girder bridge systems may be more susceptible to instability during construction than bridges constructed
of straight I-girders. The primary goal of this project is to study the behavior of the steel superstructure of curved steel Igirder
bridge systems during all phases of construction, and to ascertain whether the linear elastic analysis software used
by Mn/DOT during the design process represents well the actual stresses in the bridge. Sixty vibrating wire strain gages
were applied to a two-span, four-girder bridge, and the resulting stresses and deflections were compared to computational
results for the full construction sequence of the bridge. The computational results from the Mn/DOT analysis software were
first shown to compare well with results from a program developed specifically for this project (called the "UM program"),
since the latter permits more detailed specification of actual loading conditions on the bridge during construction. The UM
program, in turn, correlated well with the field measurements, especially for the primary flexural stresses. Warping stresses
induced in the girders, and the stresses in the crossframes, were more erratic, but showed reasonable correlation. It is
concluded that Mn/DOT's analysis software captures the behavior well for these types of curved girder bridge systems,
and that the stresses in these bridges may be relatively low if their design is controlled largely by stiffness.
Galambos, Theodore V.; Hajjar, Jerome F.; Leon, Roberto T.; Huang, Wen-Hsen; Pulver, Brian E.; Rudie, Brian J..
Stresses in steel curved girder bridges.
Minnesota Department of Transportation.
Retrieved from the University of Minnesota Digital Conservancy,
Content distributed via the University of Minnesota's Digital Conservancy may be subject to additional license and use restrictions applied by the depositor.