ABSTRACT
ABSTRACT: Cable-stayed bridges and extradosed bridges are composed of the same types of structural members, which are main girders, pylons and stay cables. These two structures of bridges are deemed to be in the same category. In Japan, composite structures have been adopted in cablestayed and extradosed bridges to reduce the construction costs and the dead load for the purpose of increasing the span length. For example, these composite structures are concrete-steel mixed girder and hybrid box girder with prestressed concrete slabs and corrugated steel webs. Therefore, it is necessary to clarify the appropriate maintenance method in consideration of structural properties of these bridges. In this paper, the appropriate maintenance method for cable-stayed and extradosed bridge with concrete-steel composite main girder was investigated. And maintenance method for these bridges was proposed.
