雁荡山特大桥主桥上部结构设计与计算

Design and Calculation of Superstructure of Main Bridge of Yandangshan Bridge

雁荡山特大桥为连续钢箱叠合拱桥结构,其主梁由2×90m连续钢箱梁组成,主拱采用2榀平行钢箱拱肋,设计矢高18.00m,2孔钢箱主拱间设置钢箱辅助拱,分别在每孔主拱拱肋之间设7道一字横撑和2道X形组合横撑,辅助拱肋设8道一字横撑,并在每孔设13对吊杆。利用ANSYS软件建立全桥空间有限元模型,分析各种荷载下的结构受力和拱脚局部受力,结果表明桥梁的承载力、刚度及局部应力均满足规范要求。

The Yandangshan Bridge is a continuous composite steel box arch bridge struc-ture. The main girder of the structure has 2 × 90-m spans continuous steel box girder and the main arch of a span has two parallel steel box arch ribs with the designed arch rise being 18.00 m. In the 2 spans of the main steel box arches, the auxiliary steel box arch was arranged. The combined cross bracings of 7 straight bracings and 2 X-shape bracings were respectively arranged between the main arch ribs of each span and 8 straight cross bracings were arranged between the auxiliary arch ribs. For the main arch of each span, 13 pairs of the hangers were arranged. The software ANSYS was used to set up the finite element model for the whole bridge, the force con-ditions of the structure and the local force conditions of the arch springs under the action of differ-ent loads were analyzed. The results of the analysis show that the load-carrying capacity, rigidity and local stress of the bridge can all meet the relevant requirements in the codes.