大跨径斜拉桥施工过程中无应力状态控制法

Stress-free Control Method in the Construction of Large Span Cable-stayed Bridge

为了满足大跨径斜拉桥目标成桥状态,得到大跨径斜拉桥在施工过程中拉索的张拉力,提出了大跨径斜拉桥在施工过程中的拉索索力计算调整拉索无应力长度的降温法。倒退分析法和传统无应力状态控制法在计算大跨径斜拉桥施工过程中存在缺陷,在传统无应力状态控制法的基础上,提出了调整拉索无应力长度的降温法。该方法可用于计算大跨径斜拉桥且计算方法简单,计算结果精度较高,能够满足工程要求。

In order to achieve the objective state of the large span cable-stayed bridge and get its cable tension in the construction,this paper presents a new calculation method for the cable tension,that is,the cooling method of adjusting the cable length in stress-free state.It is put forward on the base of the traditional Stress-free Control Method owing to the construction faults of Backward Analysis Method and the traditional Stress-free Control Method.For its simple and accurate calculation,the new method can be applied to the calculation of large span cable-stayed bridges to meet the engineering demands.