铜陵公铁两用长江大桥斜拉索锚固参数设计研究

Study of Anchoring Parameters Design for Stay Cables of Tongling Changjiang River Rail-cum-Road Bridge

铜陵公铁两用长江大桥为主跨630m的钢桁梁斜拉桥,斜拉索为三索面平行钢绞线拉索。为使该桥斜拉索的设计锚固参数精确可靠,从钢绞线斜拉索的构造、设计原理、各影响因素等方面进行研究。研究表明:钢绞线斜拉索虽在索体构造上不同于平行钢丝斜拉索,但实际锚固点是一致的;锚固参数设计时,成桥索力应按推导水平力用的水平角准确采用,应计入主梁预拱度的影响,桥塔预偏不大时可忽略。

The Tongling Changjiang River RailcumRoad Bridge is a steel truss girder cable stayed bridge with a main span of 630 m. The stay cables composed of parallel steel strands are ar ranged in three cable planes. To ensure that the stay cable anchoring parameters designed for the bridge are accurate and reliable, the study was carried out from aspects of the composition, design principles and influencing factors of the stay cables made of steel strands. The results of the study show that the stay cables made of steel strands, in terms of composition, are different from those made of parallel steel wires, but the actual anchoring points of them are the same. When the an choring parameters are designed, the cable forces in the complete bridge state must be applied ac curately according to the horizontal angles used for the derivation of the horizontal forces, the im pact of the precamber of the main girder must be considered, but when the preoffsetting of the bridge pylon is not too big, the precamber of the main girder can be ignored.