贵州乌江大桥主桥设计

Design of Main Bridge of Guizhou Wujiang River Bridge

贵州乌江大桥主桥为325m单跨简支混凝土板式加劲梁悬索桥。该桥加劲梁采用哑铃形截面;桥塔采用门形框架结构,矩形实心截面,采用挖孔灌注桩基础;息烽岸采用重力锚碇,金沙岸采用隧道锚碇;主缆采用5.1mm镀锌高强钢丝,吊索采用5.0mm低松弛镀锌高强平行钢丝。采用MIDAS Civil 2006软件对该桥进行空间整体受力分析,并采用FLAC3D软件对隧道锚及围岩进行三维弹塑性数值计算分析,结果表明该桥各项检算均满足规范要求。

The main bridge of Guizhou Wujiang River Bridge is a 325 m single-span suspen- sion bridge of simply-supported concrete slab stiffening girder. The cross section of the stiffening girder is the dumbbell section, the towers are the portal frame structures of rectangular solid sec- tions and are supported on the dug pile foundations. The anchorage of the bridge on the Xifeng bank is the gravity anchorage while on the Jinsha bank is the tunnel-type anchorage. The main cables consist of the Ф5.1 mm high-strength galvanized steel wires and the suspenders are made up of the 45.0 mm low-relaxation and high-strength galvanized parallel steel wires. The software MIDAS Civil 2006 was used to analyze the spatial global force conditions of the bridge and the software FLAC3D was used as well to carry out the three-dimensional elastoplastic numerical cal-culation and analysis of the tunnel-type anchorage and its surrounding rock. The results of the a-nalysis showed that the various checking calculations of the bridge could meet the relevant re-quirements in the codes.