反对称异型系杆拱桥设计与研究

Design and Research on Special-shaped Tied-arch Bridge with Anti-Symmetric Ribs

异型系杆拱桥是一种充分利用材料性能的合理结构桥型,同时相对常规拱桥又极具韵律、动态之美,该类桥梁在实际工程中以景观新颖、造价经济合理使其成为不错的选择桥型。通过对某跨径60 m的反对称异型系杆拱桥研究,设计刚拱刚梁自平衡体系,反对称布置异型拱肋,选定合理结构构造和矢跨比,推导出合理拱轴线,使梁拱的受力状态都较为均匀。结合有限元软件MIDAS软件进行静力、稳定性分析,表明结构的强度、刚度及稳定性均符合规范受力要求。该桥的建成丰富了桥梁造型,也为此类桥梁建设提供有益参考。

Special-shaped tied-arch bridge is a reasonable structure bridge which has the beauty of rhythm and dynamics compared with the conventional arch bridge. This kind of bridge is a good choice in practical engineering because of its novel landscape and reasonable cost. Based on the research of a 60m special-shaped tied-arch bridge with anti-symmetric ribs, the self-balancing system of rigid arch and rigid beam are designed, the anti-symmetrical arrangement of special-shaped arch ribs are made, the reasonable structure and rise-span ratio are selected, and the reasonable arch axis is deduced, so that the stress state of the beam and arch are more uniform. Static and stability analysis are carried out with the finite element software MIDAS, the results showed that the strength, stiffness and stability of the structure meet the requirements of the code. The completion of the bridge not only enriches the shape of the bridge, but also provides a useful reference for the construction of such bridges.