| The segmental precast steel tubular truss with rectangular hollow sections (RHS), in which the chord member is filled with concrete, is a novel kind of structural system. It is consist of chord members and web members.The chord members are linear type rectangular hollow section steel tubes which are partially filled or fully filled with concrete, while the web members are rectangular hollow sections. Both are made standard truss segments through welding. They have the advantages of being simple in formation and remarkable economic benefits, thus have a good application prospect. Supported by the Program for New Century Excellent Talents in University of Ministry of Education(NCET-06-0855), the Program for West Transport Construction Science and Technology(2006 318 812 112), and Applied Basic Research Programs of Ministry of Transport of China(2006 319 812 130). The standardization design, techno-economic benefits and its application in bridge engineering were studied in this paper.The paper starts with the concept and design methods of the segmental precast steel tubular truss with rectangular hollow sections, in which the chord member is filled with concrete. And a series of standard segments of steel tubular truss with the rectangular hollow sections and concrete-filled steel tubular truss with the rectangular hollow sections were designed. On that basis, their techno-economic benefits were analyzed and finally the case studies were given for their application in bridge engineering. The main achievements are summarized as follows:(1) The standardization design of the segmental precast steel tubular truss with the rectangular hollow sections, in which the chord member is filled with concrete, was studied. And the design method of the compression and flexural member and steel tubular trusses with the rectangular hollow sections, in which the chord member is filled with concrete, was stated. Meanwhile, a series of standard segments of steel tubular truss with the rectangular hollow sections and steel tubular truss with the rectangular hollow sections, in which the chord member is filled with concrete, were designed. The assembled technologies in Latitudinal and longitudinal direction of the segmental precast steel tubular truss with the rectangular hollow sections, in which the chord member is filled with concrete, were given a pilot study. These all lay the theoretic foundation for the techno-economic benefits analysis and the application in continuous girder bridges and suspension bridges.(2) The techno-economic benefits for it were analyzed, where the influencing factors of the compression and flexural member and steel tubular truss with the concrete-filled rectangular hollow sections in the field of the techno-economic benefits were taken into account. According to an example in engineering, a program was made to get the most economic sectional dimension and thickness of steel tube using the software "Lingo", where engineering cost is made the objective function, construct details and mechanical property as the constraint condition. Finally the economic efficiency comparison and parametric analysis were given between the optimized and the original structures.(3) According to the engineering background of Xiangjiaba Bridge and LiXi Bridge, numerical simulations were taken for the application in continuous girder bridges and suspension bridges, and the static and dynamic performances and economic efficiency for it were also given an analysis in details.(4) A summary was given to this paper, and the problems which need further study were presented. |
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