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原文传递 Rational Load Rating of Deck-Girder Bridges with Girder End Shear Cracks in Reverse Orientation, Technical Summary

题名：	Rational Load Rating of Deck-Girder Bridges with Girder End Shear Cracks in Reverse Orientation, Technical Summary
作者：	Bernica, A.; Rasheed, H.
关键词：	Load rating##Deck girder bridges##Rational Load Rating##Deck-Girder Bridges##Reverse diagonal shear cracking##Girder bridge##Shear cracking##Technical summary##Bridge evaluation##Concrete girder##
摘要：	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.
总页数：	2
报告类型：	科技报告