结合实际锚固构造的大跨斜拉桥索形计算方法

大跨度斜拉桥设计中,斜拉索精确状态的计算是一步重要的计算环节,但求解不易。为解决这一问题,以悬链线解析法为基础,综合考虑索梁锚固构造和索塔锚固构造的影响,提出在斜拉索张拉力、斜拉索规格已知时精确求解斜拉索线形、无应力长度的迭代计算方法,并以一个算例演示计算过程。提出的斜拉索索形计算方法理论上可求得斜拉索索形的精确解,设计者也可根据实际需要设置迭代终止条件控制计算精度;通过算例可知采用本方法计算迭代收敛速度快,计算效率高;在实际工程中,可用于合理成桥状态或某一施工阶段的斜拉索索形求解。

Calculation Method of Cable State of Long-span Cable-stayed Bridge Combined with Anchorage Structure

The calculation of the exact state of the cable is an important step in the design of long-span cable-stayed bridges, but it's difficult to solve. In order to solve this problem, this paper proposes a calculation method of cable state based on catenary analysis method. The calculation method, taking into consideration of the anchorage structure in pylon and beam, can accurately solve the cable state with known tension and specification of the cable, and the calculation process is demonstrated by an example. The calculation method of cable state proposed in this paper can theoretically obtain the exact solution and the designer can also set iteration termination conditions to control the calculation accuracy according to actual needs. The calculation example shows that the method is applicable in practical engineering with fast iteration convergence speed and high calculation efficiency and can be used to solve the cable state in completion stage of bridge or certain construction stage.