Based on the spatial model, a reliable and accurate calculation method on the shape finding of selfanchored suspension bridge with spatial cables was studied in this paper. On the principle that the shape of the main cables between hangers is catenary, the iteration method of calculating the shapes of the spatial main cables under the load of hanger forces was deduced. The reasonable position of the saddle was determined according to the shape and the theoretical joint point of the main cables. The shapes of the main cables at completed cable stage were calculated based on the unchanging principle of the zerostress lengths of the main cables. By using a numerical method combining with the finite element method, one self-anchored suspension bridge with spatial cables was analyzed. The zero-stress length of the main cables, the position of the saddle, and the pre-offsetting of the saddle of the self-anchored suspension bridge were given. The reasonable shapes of the main cables at bridge completion stage and completed cable stage were presented. The results show that the shape-finding calculation method is effective and reliable.
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The Yongjiang Railway Bridge carrying 2-lines heavy-load railways is a steel-concrete mixed box girder cable-stayed bridge with the span arrangement of 53 50+50+66+468 66+50+50+53 m. The stiffening girder is a closed and streamlined box girder with two materials longitudinally: the center 419m of main span is steel box girder installed by deck cranes and the rest of the girder is site-cast concrete box girder.</p><p>
Considering that the railway bridge possesses characteristics of carrying heavy railway live load, high requirements for the stiffness of the whole structure, fixed railway tracks, an innovative concept of the structural system for long-span railway bridges is carried out, and three Innovative Technologies is obtained including orthotropic steel deck stiffened by V-shaped ribs, steel-concrete joint with ladder-shaped concrete filled in and frontal/ posterior compression-bearing plates, bilateral–bearing-load cable-girder steel anchorage box. The experimental research proves that orthotropic steel deck stiffened by V-shaped is superior in fatigue behaviour, the proposed new types of steel cable-girder anchorage box and steel-concrete joint both have good performance in the force transferring and fatigue properties. And also vehicle-bridge coupling vibration analysis also shows that the steel-concrete joint achieves smooth transition of stiffness and the trains run smoothly.</p>
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