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目前在系杆拱桥全桥有限元模型中,拱脚多采用与拱肋相一致的刚度,使得荷载响应与实际结构有显著差异。为得到更真实的系杆拱桥荷载响应,通过建立具有可比性的拱脚局部精细化实体模型和变刚度的局部杆系模型,定义基于位移响应差值的等效静力刚度指标,提出了适用于系杆拱桥拱脚的等效静力刚度理论。作为一个应用实例,将上述理论应用于罗蕴河拱桥的全桥力学性能分析中,结果表明在不考虑该理论的情况下,拱肋挠度验算过于保守,而吊杆的疲劳验算则偏不安全。提出的拱脚等效静力刚度理论将为系杆拱桥吊杆疲劳性能研究提供一定的理论基础。
At present, in the full-bridge finite element model of tied arch bridge, the rigidity of the arch arch is more consistent with the arch rib, which makes the load response significantly different from the actual structure. In order to obtain a more realistic load response of the tied arch bridge, an equivalent static stiffness index based on the displacement response difference is defined by establishing a local rod model with comparable local arch refinement model and variable stiffness. Equivalent Static Stiffness Theory of Tied Arch of Tied Arch Bridge. As an application example, the above theory is applied to the mechanical analysis of full bridge of Luoyunhe arch bridge. The results show that without considering this theory, the deflection checking of arch rib is too conservative, while the fatigue checking of boom is unsafe. The proposed theory of equivalent static stiffness of arch foot will provide a theoretical basis for the study of the fatigue performance of the tie bar boom.