郁江特大桥主塔锚固区应力状态仿真分析

发布时间：2018-08-20 09:58

【摘要】：南广(南宁—广州)客运专线郁江特大桥为主跨228m的双塔双索面铁路双线钢桁梁斜拉桥。为确保其主塔锚固区的受力安全,根据主塔锚固区截面、配筋及预应力的设计参数,采用有限元软件ANSYS及等效荷载法和实体力筋法建立三维仿真计算模型,分析主塔锚固区在主塔施工完毕、第1次和第2次拉索完成3种工况条件下的应力状态。结果表明:在3种工况条件下,主塔锚固区的绝大部分节点以受压为主,切应力很小,而且压应力最大的节点位于预应力筋附近,最大压应力为28MPa;主塔锚固区受到的拉应力主要分布在主塔内侧,方向接近竖直向上,一般不超过4MPa;与主塔施工完毕时相比,第1次和第2次拉索完成后,锚固区顺桥向发生微小不对称位移,预应力筋附近的最大压应力有所减小,主塔内侧拉应力有所增加,预应力有效地抵消了拉索传递过来的拉力;混凝土抗压强度及钢筋抗拉强度均有较大的安全裕量,锚固区变形很小,满足结构的刚度要求。
[Abstract]:Yujiang Bridge in Nanguang (Nanning-Guangzhou) passenger dedicated line is a steel truss girder cable-stayed bridge with two towers and two cable planes with main span of 228m. In order to ensure the stress safety of the Anchorage zone of the main tower, according to the design parameters of the section, reinforcement and prestress of the Anchorage zone of the main tower, a three-dimensional simulation model is established by using the finite element software ANSYS and the equivalent load method and the solid force reinforcement method. The stress states of the main tower Anchorage area under the three conditions of the first and the second cable are analyzed after the construction of the main tower is completed. The results show that most of the joints in the Anchorage zone of the main tower are mainly under compression, the shear stress is very small, and the joint with the largest compressive stress is located near the prestressed tendons under three working conditions. The maximum compressive stress is 28 MPA. The tensile stress in the Anchorage area of the main tower is mainly distributed in the inner side of the main tower, which is close to vertical upward and generally does not exceed 4 MPa. Compared with the completion of the construction of the main tower, after the first and second time cable is finished, the tension stress of the Anchorage zone of the main tower is mainly distributed in the inner side of the main tower. In the Anchorage zone, the small asymmetrical displacement occurs along the bridge, the maximum compressive stress near the prestressed tendons decreases, the tensile stress inside the main tower increases, and the prestress effectively counteracts the tensile force transferred by the cables. The compressive strength of concrete and the tensile strength of steel bar have great safety margin, and the deformation of Anchorage zone is very small, which can meet the requirement of structure stiffness.
【作者单位】：中国铁道科学研究院铁道建筑研究所;
【基金】：铁道部科技研究开发计划项目(2010G004-B)
【分类号】：U448.27;U441.5

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