中文摘要：

为研究钢桥塔锚固区钢锚箱结构的受力特性及其传力机理，以天津市蓟运河大桥（钢箱梁独塔斜拉桥）为工程背景，基于有限元软件ANSYS 14．0，采用等效板厚法，建立了2个（S1号索和S13号索）钢锚箱结构的全实体单元有限元模型，对其应力分布、索力传递路径以及焊缝传力机理进行了分析。结果表明：钢锚箱各板件V o n M ises应力均小于200 M Pa ，满足规范要求；由承压板、承剪板和加劲板共同构成的闭口箱形截面钢锚箱可以顺畅地传递斜拉索索力；S1号索、S13号索钢锚箱模型的钢锚箱分别表现出梁式和柱式锚箱的受力特性；柱式锚箱承剪板长度选取不宜过长，该桥S13号索钢锚箱承剪板长度最终取为1.4 m。

英文摘要：

To investigate the force characteristics and force transfer mechanism of the steel an‐chor box structure in the anchorage zone of steel pylon ,the Jiyun River Bridge （a single‐pylon steel box girder cable‐stayed bridge） in Tianjin City was cited as an example ,two complete solid fi‐nite element models of the steel anchor box structures for the stay cables S1 and S13 of the bridge were set up by the equivalent plate thickness method ,using the software ANSYS14 .0 and the stress distribution ,cable force transfer paths and the force transfer mechanism of the weld seams of the structures were analyzed .The results of the analysis demonstrate that the Von Mises stress of the different plates of the steel anchor box structures is all less than 200 M Pa and can meet the relevant requirements in the codes .T he type of the steel anchor box of closed box section formed by the bearing plate ,shear plates and stiffening plates can smoothly transfer the stay cable forces . The steel anchor boxes in the models for the stay cables S1 and S13 respectively exhibit the force characteristics of the beam and column steel anchor boxes .The selected length of the shear plates of the column steel anchor box should preferably not be too long and the length of the shear plates of the steel anchor box for the stay cable S13 is finally selected as 1 .4 m .