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In Metropolitan Expressway, many fatigue damages on beam-column connection of the rigid frame steel pier are reported. We have been working to repair and reinforce the damaged areas. For the connection of bridge piers with ordinary shapes, reinforcement structures are standardized and they can be designed in accordance with the standards. However, for those bridge piers with complex stress properties, reinforcement measures have been individually studied. We have identified the stress properties of a structure in which a bridge pier with complex stress properties is rigidly joined to the main girder, and then studied a reinforcement structure, through FEM analysis and stress measurement. This report describes an overview of the study and its result.
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