Rational load rating of deck-girder bridges with girder end shear cracks in reverse orientation : technical summary.
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2017-04-01
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Abstract:A user interface creates a grillage model of an existing bridge and places various rating trucks on the
bridge. Equivalent flexibility analysis distributes truck live loads within deck panels to surrounding
girders and diaphragms. Stiffness matrices are utilized to find nodal displacements and reactions at the
girder supports caused by truck live loads and bridge dead load. These reactions are checked against RISA
software models to test the accuracy of the stiffness matrix application. ABAQUS FE models and Mohr’s
circle stress distribution determine driving and clamping forces on the crack due to resolution of dead
and live load reactions and friction force generated between the concrete girder and rusty steel bearing
pad along the shear crack orientation. In addition to the simplified modified compression field theory,
these clamping and driving forces are used to determine the shear capacity of each girder at the reverse
cracks. A modified version of Equation 6B.4.1 from the Manual for Bridge Evaluation (AASHTO, 2011)
is used to find operating and inventory rating factors (RFs) for the bridge.
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