大きなき裂損傷が発生した鋼桁橋の全体残存耐荷力に関する解析的検討

抄録

In recent, much damage has been detected in superannuated bridges. Especially, the fatigue problems of aged steel bridges become serious in the maintenance of the bridges. Recently, the serious and large crack of approximately 1.1m length was detected. In the web plate of interior main girder at the intersection of the main girder and the transverse girder, and at the location near the interior support in the center span of a three-span continuous girder bridge. If such a large crack occurs, the load carrying system of bridge should be changed and its capacity will be decreased. Accordingly, it is important to evaluate the load residual carrying capacity of damaged bridges with a large crack from the viewpoint of the management of the bridge system. The objective of this study is to investigate analytically change of the load carrying system of the various damaged three-span continuous girder bridges with four main girders.