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多拱肋蝶形拱桥由于拱肋的异化导致结构的受力异常复杂且空间效应明显,拱肋的外倾角、矢跨比、含钢率等各种设计参数均会对该桥型的空间稳定性产生不同程度的影响。以太原市南中环主桥为背景,采用不同的方法对钢管混凝土拱肋进行模拟,并建立全桥空间有限元模型,深入研究了多拱肋蝶形钢管混凝土拱桥的空间稳定性及其影响因素,结果表明:主副拱肋的外倾角对结构稳定性的影响并不明显;存在一个理想的矢跨比值,使得结构的稳定系数最大,结构最为稳定;拱肋的初始缺陷会降低结构的整体稳定性;拱肋刚度的计算方法对稳定系数的影响也较大;增大拱顶附近截面的含钢率有利于增强结构的整体稳定性;拉杆等构件的刚度对结构的稳定性也存在着规律性的影响。
Due to the alienation of the arch rib, the stress of the structure is extremely complex and the space effect is obvious. Various design parameters of the arch rib, such as the camber angle, the ratio of span to span and the steel content rate, will stabilize the space of the bridge type Sex has varying degrees of impact. Taking the South Central Main Bridge of Taiyuan as the background, different methods were used to simulate the concrete arch rib of CFST, and the finite element model of the full bridge was established. The spatial stability of the multi-arch rib CFST arch bridge and its influencing factors The results show that the camber angles of the main and auxiliary ribs have no obvious effect on the stability of the structure. There is an ideal ratio of pitch to span, which results in the largest stability coefficient and the most stable structure. The initial defects of the ribs will reduce the overall structure Stability; the calculation method of arch rib stiffness also has a greater impact on the stability coefficient; increasing the steel content of the section near the vault is conducive to enhancing the overall stability of the structure; stiffness of the rod and other components of the stability of the structure also exists The impact of regularity.