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斜拉拱桥是一种将斜拉桥和拱桥相结合的新型桥梁结构形式,索拱共同受力使得拱的稳定性区别于一般拱桥。单肋斜拉拱是斜拉拱桥稳定性研究的基础,本文基于能量原理,在综合考虑桥面刚度、吊杆非保向力、斜拉索非保向力的前提下,推导了单肋斜拉拱横向失稳临界荷载的实用计算公式,并通过算例验证了实用计算公式的正确性,借助实用公式分析了斜拉索参数:斜拉索预张拉力、斜拉索倾角、索在拱的布置范围、主塔与拱的距离对单肋斜拉拱横向失稳临界荷载的影响。
The cable-stayed arch bridge is a new type of bridge structure which combines the cable-stayed bridge and the arch bridge. The common stress of the cable arch makes the stability of the arch different from the general arch bridge. The single-rib cable-stayed arch is the foundation of the stability study of the cable-stayed arch bridge. Based on the energy principle, under the precondition of considering the stiffness of the bridge deck, the non-retention force of the boom and the non-retention of the stay cable, The calculation formula of the critical load of the lateral stability of the arch is given. The correctness of the practical calculation formula is verified by an example. The parameters of the stay cable are analyzed by the practical formula: prestressing force of the stay cable, inclination angle of the stay cable, The influence of the distance between the main tower and the arch on the critical load of the transverse instability of single-rib cable-stayed arch.