The purpose of this study is to analyze the cause of corrosion associated with steel barrier wall corrosion, to review the current state of safety, and to describe the parts to consider in future design and maintenance.Also, when selecting the bridge type for the reduction of the long life and reducing the load, it is necessary to avoid the steel wall barrier of the entire cross-section of the barrier wall in the case of the steel plate type,I would like to discuss about reflection.

The objective of this study is to identify reasonable repair and reinforcement methods by performing an analysis and analysis and measurement of corrosion that occurred at the bridge support due to leakage from the expansion joint device.

Recent developments in technology, the use of complex composite section, such as composite truss girder is increasing. These sections, the tensile stress will be generated internal and external constraints caused by other materials. Thus, the effects of the panel point on the concrete slab was studied through the structural analysis.

The objective of this study is the compensation countermeasure following settlement of culvert which is installed to the back of abutment as a whole, cause analysis about settlement, considering rational repair reinforcement method, and researching the points to be considered for structure design and construction.