| Beijiang River Bridge on New Guiyang-Guangzhou Railway is designed as a steel truss cable-stayed bridge with span arrangement (57.5+109.25+230+109.25+57.5) m, double pylons, two cable planes and two main trusses, which allows four railway lines. Concrete deck is adopted in the segments of side span and four segments of the edge span next to side span, while orthotropic steel deck is adopted in the rest part. Two longitudinal beams are set on the inside of lower chords, and longitudinal beams and the lower chords are connected by horizontal K shores. Deck load is tarsported to cross beams through deck,cross ribs and longitudinal beams, and then to lower chord nodes. This bridge structure is firstly used at home. Mechanical behaviors of Beijiang River Bridge in the finished state and construction states is analyzed in this paper. Main work of this paper is as follows:1. Space finite element model of the full bridge was established by SPB (Space Plate-Beam) method. Influence matrix method and zero-displacement method were adopted comprehensively to determine cable forces under dead load, and mechanical feathers and status of this bridge under both cable tensions and dead load were analyzed at the same time. Results show:the bridge is in a smooth line shape and mechanical condition.2. The mechanical feathers of the bridge under worst-case of living load and the combination of main loads were researched. Results show that the bridge is strong enough to satisfy the requirements of trains' operation safety and comfortableness.3. Based on the principle of fewer times of stretching the cables and better stress condition of the bridge under construction, forward-iteration method combined with finite difference method was adopted to determine cable tensile forces during construction process.The research results of this paper provide evidence for design and construction of Beijiang River Bridge and references for other similar structures. |
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