A PROPOSAL FOR 4000m-SPAN CABLE-STAYED SUSPENSION BRIDGE

摘要

This paper proposed a compound bridge of suspension bridges and cable-stayed bridges with 4000 m super-long-span over the Tsugaru Strait, Japan. Near to the main towers, cable-stayed bridges and prestressed concrete decks are proposed, it is help for enhance rigidity and endure the great axial compression force. In the center of span, suspension bridges and steel box decks stiffened by trusses are proposed, it can reduce self-weigh and the space between girders will contribute to aero-elastic stability. RCFT main tower, RC shell pier and RCFT jacket foundation can enhance rigidity and reduce self-weigh. As a result, the live-dead load ratio of proposal is 0.05 and equivalent to 2500m-span suspension bridge.