湛河提篮式拱桥空间弹性稳定性分析

Spatial elastic stability analysis of the Zhanhe X-style arch bridge

为了解平顶山市湛河提篮式拱桥的横向稳定性,采用大型有限元程序ANSYS建立该提篮式拱桥的空间有限元计算模型。为了与平行拱肋拱桥的稳定性对比,同时建立了平行拱肋拱桥空间有限元计算模型,对两种桥型进行空间弹性稳定性计算与对比分析。计算结果显示:提篮式拱桥失稳形式以拱肋的面外失稳为主,拱肋无横撑区域是全桥稳定的薄弱部位;与平行拱肋拱桥相比,提篮式拱桥横向稳定性显著提高,第1阶拱肋的横向失稳模态发生了改变。计算结果用于确定湛河提篮式拱桥的设计方案。

In order to understand the lateral stabilities of Zhanhe X -style arch Bridge in the city of Pingdingshan, its spatial finite element numerical model was built by utilizing the general finite element software ANSYS. For the purpose of making a comparison with the stability of the parallel rib arch bridge, the corresponding spatial model was also created, and the spatial elastic stability calculation and analysis of the two types of the arch bridges were carried out. The results indicate that the buckling modes of X - style arch bridge give priority to the buckling mode of out of plane of arch rib, and the region of the rib without transverse bracings is the weak point of the bridge. Comparing to the parallel rib arch bridge, the traverse stability of X - style arch bridge is obviously improved, and the 1st buckling mode of arch rib changes. The analysis results can be used to determine the design plan of Zhanhe X- style arch Bridge.