Currently, aging bridges have become a social issues, there is an increasing demand for large-scale replacement. In the replacement RC deck of composite steel girder bridge, because there are a lot of problems, there is a need to propose a rational method that takes into account reduction of cost and shortening of the construction period. In this study, we focused on the replacement RC deck of the composite steel girder bridge. We conducted a framework analysis to examine amount of reinforcement of the main girder. As a result, it revealed that it is possible to effectively reduce the amount of reinforcement by removing the load distribution crossbeam partially.
