无横撑下承式系杆拱桥侧倾稳定临界荷载的一般公式

General Formula for Lateral Buckling Critical Force of Through Bowstring Tied Arch Bridge Without Transverse Beams

通过对系杆拱桥作用在拱肋上的荷载性质进行了分析,采用能量法推导出无横撑下承式系杆拱桥侧倾稳定临界荷载的一般公式。指出系杆拱桥侧倾稳定存在有2种临界荷载,即自重荷载直接作用的临界荷载和吊杆拉力等效薄膜力的临界荷载,并通过算例对自重荷载直接作用的临界荷载所提出的方法和有限元法进行了比较验证。

This paper analyzed load loads acting on arch ribs of bowstring tied arch bridge. Using energy method, the general formula for calculation of lateral stability of through bowstring tied arch bridge without transverse beams given. Two definitions for critical load of lateral stability of bowstring tied arch bridge are put forward in this article for the first time. The first one is uniformly distributed load of deadweight, which has weight characteristic, the other one is critical load of equivalent membrane force of suspenders, and these critical loads are verified by comparing examples to calculating data of finite element analysis.