Abstract
In view of the demand of 800 meters Super Long Span CFST arch bridge, the composite bridge of CFST flying swallow arch and self-anchored suspension cable is proposed. The thrust of flying-bird CFST arch bridge and the tension of self-anchored suspension bridge are balanced, forming a self-balanced structure system. The arch rib structure is mainly stressed, supplemented by the self-anchored suspension system, which works together and has complementary advantages. Using the single leaf hyperboloid variable section steel tube four limb space truss arch rib structure, the self-weight of the mid span arch rib section structure is reduced, the risk of construction and hoisting of the mid span section is reduced, the section size at the arch foot is increased, the mass center and stiffness center of the arch bridge structure are effectively reduced, and the stability of the super long span concrete-filled steel tube arch bridge is increased. Combined with the actual project, the parameters are designed, the Midas finite element model is established, the internal force analysis and calculation, modal analysis and buckling analysis are carried out, and the superiority of the structural technical measures is verified.
Highlights
With the increase of span swallow type of concretefilled steel tube arch bridge, arch bridge weight increasing, structural internal force increase, segmental hoisting construction difficulties, a significant reduction in the arch bridge structure stability, can lead to the development of swallow type of concrete-filled steel tube arch bridge in technical bottleneck [3,4], build more long-span concretefilled steel tube flitting models type arch bridge will have a greater risk of structural technology
Combining with the design requirements of Chongqing in the planning of the Yangtze river highway bridge, for 800 meters level of large span concrete filled steel tube swallow type arch combined with the anchor cable bridge geometric configuration research, engineering parameter design, and establish the Midas finite element model, internal force analysis, modal analysis and buckling analysis research, in order to verify the structural advantages of technical measures
Analysis shows that the level of 800 meters swallows of concrete filled steel tubular arch bridge adopts hyperboloid of one sheet shape cross-section of concrete filled steel tube space truss arch rib limbs and swallow arch combined with suspension cable bridge two new technology, greatly improved the swallow type of concrete-filled steel tube arch bridge structural stability models, successfully solved the level of 800 meters of concrete filled steel tubular arch bridge, the stability of the key problems to break the swallow type of concrete-filled steel tube arch bridge structure of the development of the technology bottleneck
Summary
Flying-swan arch bridge is a self-balanced structure system, which is deeply loved by people for its advantages such as beautiful shape, large span capacity, good economy, convenient construction, large structural stiffness and good durability [1,2]. The combination bridge with 800m steel tube flying-type arch and self-anchored suspension cable has the advantages of convenient construction, large span capacity, low cost, large stiffness, high bearing capacity and good durability, etc., and its structural technical advantages are very obvious. Combining with the design requirements of Chongqing in the planning of the Yangtze river highway bridge, for 800 meters level of large span concrete filled steel tube swallow type arch combined with the anchor cable bridge geometric configuration research, engineering parameter design, and establish the Midas finite element model, internal force analysis, modal analysis and buckling analysis research, in order to verify the structural advantages of technical measures. The 800 meters flying-type arch and self-anchored suspension cable composite bridge adopts four singleblade hyperboloid variable section steel tubes to form the space truss arch ribs of the base-shaped arch limbs. The variable section steel tube arch rib reduces the section size at the arch top, increases the section size at the arch foot, reduces the lifting construction weight of the mid-span segment, and increases the stability of the super-large span Flying-type concrete filled steel tube arch bridge
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