ハイブリッド吊床版道路橋の提案 : (その1)上部工の試設計と静力学特性(都市基盤デザイン工学科)

Abstract

In our previous study, a design concept for hybrid stress-ribbon pedestrian bridges was proposed. In this paper, hybrid stress-ribbon vehicle bridges with a span length of L=200, 400 or 600m are proposed, and the preliminary design of superstructure and the examination of their static characteristics are made. The findings revealed that the weight of the stiffening truss girder per unit area was about half of a streamlined steel box girder for a conventional suspension bridge, and that the total number of the upper and lower cable strands was respectively found to be 16, 40 and 60. The diameters of the 16-, 40- and 60-strand single cable were estimated to be 26, 40 and 50cm and were not too large. Regarding the static characteristics, the deformation and deflection of girder were well controlled by the upper cable, and the maximum normal force in the lower cable was 90% of the resisting force. Therefore, the above results suggest that the design concept for the proposed hybrid stress-ribbon structure could be applied to vehicle bridges with a single span of 200-600m.