斜拉桥索塔分离式斜置钢锚箱受力分析  

Force Condition Analysis of Separated and Obliquely Set Steel Anchor Boxes in Pylon of Cable-Stayed Bridge

作　　者：李福鼎[1] 

机构地区：[1]上海市政工程设计研究总院(集团)有限公司,上海200092

出　　处：《桥梁建设》2016年第1期88-93,共6页Bridge Construction

摘　　要：为研究斜拉桥索塔分离式斜置钢锚箱的特性,对其结构特点及索塔锚固区受力进行分析。由于钢锚箱分离斜置,横桥向水平分力无法自平衡,塔柱相对于钢锚箱刚度增大,塔柱同时承担全部横桥向水平力和较多顺桥向水平力。以某独塔斜拉桥菱形桥塔为例,采用ANSYS建立索塔钢锚箱空间模型,分析钢锚箱斜置对钢锚箱和塔壁应力分布的影响及斜拉索水平力在两者间的分配比例。结果表明:相对于整体式钢锚箱,分离式斜置钢锚箱斜拉索水平力分配比例降低,混凝土塔柱承担了较多水平分力,钢锚箱各板件和剪力钉受力不对称,应力水平较低且分布不均。To study the characteristics of the separated and obliquely set steel anchor boxes in pylon of cable-stayed bridge, the structural characteristics of the anchor boxes and the force condi- tions of the anchorage Zone in the pylon were analyzed. Because the anchor boxes were separated and obliquely set, the transverse horizontal component force could not be self-balanced and in com- parison to the rigidity of the anchor boxes, the rigidity of the concrete pylon columns increased and at the same time, the pylon columns.bore the whole of the transverse horizontal force and much of the longitudinal horizontal force. By way of example of the diamond-shape pylon of a single-pylon cable-stayed bridge, the software ANSYS was used to establish the spatial finite element model for the anchor boxes in the pylon, the influences of the obliquely setting of the anchor boxes on the stress distribution of the anchor boxes and pylon walls as well as the ratios of the horizontal force distribution of the stay cables between the anchor boxes and pylon wails were analyzed. The re- suits of the analysis show that as compared to the integral steel anchor box, the ratios of the hori- zontal force distribution of the stay cables of the separated and obliquely set steel anchor boxes de- crease and the pylon columns bear much of the horizontal component force. The force conditions of the components and shear studs of the anchor boxes are not symmetric, the stress levels are low and are not uniform.

关 键 词：钢锚箱 斜拉桥 菱形桥塔 索塔锚固区 结构特点 受力分析 有限元法 

分 类 号：U443.38[建筑科学—桥梁与隧道工程] U448.27[交通运输工程—道路与铁道工程]