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珠江黄埔大桥北汊桥为独塔双索面钢箱梁斜拉桥。斜拉桥总体上属于缆索承重结构,但其主要组成部分中的索塔以及加劲梁是以受压为主的压弯构件,特别是薄壁钢箱梁斜拉桥,它们的稳定性对其结构的安全是至关重要的。考虑非线性影响后的稳定分析将强度和稳定两方面联系起来考虑,能真实地描述结构实际受力特性。同时考虑材料非线性与几何非线性对斜拉桥的稳定性影响最大,其稳定安全系数约为弹性稳定安全系数的35%~38%。
Pearl River Huangpu Bridge Beibei Bridge is a single tower double cable plane steel box girder cable-stayed bridge. The cable-stayed bridge generally belongs to the cable-bearing structure, but the pylon and the stiffening girder in the main components of the cable-stayed bridge are mainly compression-bent members, especially the thin-walled steel box girder cable-stayed bridges. Their stability Security is paramount. The stability analysis considering the influence of nonlinearity considers both the strength and the stability, and can truly describe the actual stress characteristics of the structure. At the same time, considering the material nonlinearity and the geometric nonlinearity, the stability of the cable-stayed bridge has the greatest impact. The stability safety factor is about 35% ~ 38% of the elastic stability safety factor.