Nakano Viaduct, which is located in the North Kobe Line of Hanshin Expressway, has been planning as a prestressed concrete box girder bridge with corrugated steel webs. The structural scheme is expected to reduce the self-weight and to shorten the construction period comparing with conventional PC box girders. The following technical characteristics, which have been seldomly applied in the similar formed bridges, are presented: 1. Using field fillet welding joints between corrugated steel webs; 2. Partial prestress-ing on concrete slab in which the tensile stress is controlled within an allowable range and no cracks would occur; 3. Using CT shaped steel plate combining with headed studs as shear connection between concrete slab and corrugated steel webs. Since the above mentioned points were adopted in this bridge without any precedents in Japan, three series of large-scale loading tests were carried out for the purpose of identifying its safety and structural characteristics. In this paper, the proprieties of design methods for Nakano Viaduct are discussed based on the test results.
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