针形独塔斜拉桥结构特性的分析

上海蕴藻浜大桥主桥由于建筑景观要求而采用针形独塔斜拉桥方案。斜拉桥主塔塔底和主墩采用铰接的连接方式使结构性能变得复杂,而具有不同于一般斜拉桥结构设计的特点。以主梁梁高为参数,分析了拉索索力、主塔应力、主梁应力与位移、主桥颤振风速等结构要素的变化趋势,得到一些有助于主桥结构设计的建议。

Preliminary Study on Structural Behavior of Cable-stayed Bridge with Single Needle-shaped Pylon

The main bridge of Shanghai Yunzaobang Bridge adopts the option of cable-stayed bridge with single needle-shaped pylon,due to high demands on the bridge’s architectural landscape.Hinged connection between the pylon bottom and the main pier makes the structural behavior complicated and shows different features for structure design compared with other regular cable-stayed bridge.Taking the height of main girder as analytical parameter,the variable regularity of structural principles such as force of stayed cable,stresses and deformation of main girder,stresses of main pylon,and wind flutter speed of the bridge etc.,is studied to give some suggestions for structure design of the main bridge.