三塔自锚式悬索—斜拉协作体系成桥状态计算方法

Calculation Method of Three Towers Self-Anchored Suspension and Cable-Stayed Composite Structure in Completion State

由于自锚式悬索—斜拉协作体系桥桥型比较特殊,现有的斜拉桥和悬索桥计算合理成桥状态的方法己经不再适用,为了找寻自锚式悬索-斜拉组合结构的合理成桥状态方法,以三塔自锚式悬索-斜拉协作体系桥为例,进行了成桥状态计算方法研究,提出了协作体系的分步成桥状态法。结果表明,利用分步成桥状态法计算得到的成桥状态下的加劲梁,位于设计曲线上,并且恒载弯矩较为均匀,分布合理,符合连续协作体系的受力特点;自锚式悬索段主缆索力均匀,斜吊杆索力分布合理;斜拉段主塔弯矩较小,斜拉索索力分布均匀;分步成桥状态法可以用于三塔自锚式悬索-斜拉协作体系成桥状态的确定。

Because self-anchored suspension and cable-stayed bridge is different from traditional cablesupported bridges,the reasonable result couldn＇t be got according to the present available calculating methods for reasonable completion state of cable-stayed bridges and suspension bridges. Based on this principle and geometric nonlinear calculation, the step-by-step calculating method for the reasonable completion state of three towers self-anchored suspension and cable-stayed bridge is proposed on the basis of some available methods. Numerical results show that the structure loading is reasonable and this method can be used for the calculation of three towers self-anchored suspension and cable-stayed bridge.