钢锚箱连接对索塔锚固体系受力性能的影响

Effects of connections of exposed steel anchor boxes on the mechanical behavior of pylon anchorage system

为明确多节段钢锚箱式索塔锚固体系的传力机理,以杭州湾跨海大桥北通航孔桥为例,采用有限元分析软件(ANSYS11.0),研究了钢锚箱之间连接与不连接两种方式对索塔锚固体系受力性能的影响。结果显示,钢锚箱之间是否连接对锚固体系各节段以及节段内各构件承担的水平力影响较小,对各节段整体承担的竖向力无影响,而对各节段钢锚箱及塔壁承担的竖向力影响较大;钢锚箱之间是否连接对钢锚箱板件应力、混凝土塔壁应力以及栓钉剪力的分布规律具有明显影响,与钢锚箱不连接体系相比,钢锚箱连接体系各构件的应力或剪力分布更为均匀。

This paper aims to study the mechanical characteristics and load transfer mode of pylon anchor system with steel anchor boxes.Taking the north navigable bridge of Hangzhou Bay cross-sea bridge as an example, we analyzed the mechanical behavior and cable force distribution pattern influenced by the connections of steel anchor boxes using finite element analysis（ANSYS 11.0）. The results show that when the connection of the steel anchor box is transformed, the transferring force of the anchorage segment and its components are changed slightly, the vertical force transmitted by the anchorage segment has no change, while the vertical force transmitted by the steel anchorage box and pylon wall are changed evidently. Whether the steel anchor box is connected has a great influence on the distribution laws of the stress on the steel plate and concrete pylon wall and the shear force on studs. The stress on the steel plate and concrete pylon wall and the shear force on studs are more evenly distributed in connected steel anchor boxes than those in separated ones. The stress distribution pattern of the side plate and diaphragm are impacted slightly by the connection of steel anchor boxes, while that of the end plate and pylon wall are impacted significantly.