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空间六索面四拱肋的蝶形钢管混凝土拱桥桥型在太原市南中环主桥的设计中得到了应用,目前尚属国内首例,因此对该桥型的研究较少,尤其是空间稳定性问题。基于统一理论和有限单元法,建立该蝶形拱桥的空间有限元计算模型,分别对主副拱肋不同矢跨比的设计方案进行稳定性分析,研究矢跨比对空间稳定性的影响。结果表明,主拱的矢跨比不但影响结构的稳定系数,还使结构的失稳形式发生了变化,而副拱的矢跨比对结构的失稳形式影响不大。
The four-ribged CFST arch bridge with space six-cabins has been applied in the design of the main bridge of south-central Central Taiyuan, and is still the first one in China at present. Therefore, less research has been done on the bridge type, especially the space stability Sexual issues. Based on the unified theory and the finite element method, the finite element model of the butterfly arch bridge is established. The stability analysis of the design scheme of the main and auxiliary arch ribs with different aspect ratios is carried out respectively, and the influence of the aspect ratio on the space stability is studied. The results show that the ratio of the span to the span of the main arch not only affects the stability coefficient of the structure, but also causes the instability of the structure to change. However, the effect of the arch-span of the secondary arch has little effect on the instability of the structure.