设有纵向连杆的异型拱桥受力性能分析

Stress Performance Analysis of Special-shaped Arch Bridge with Longitudinal Linkage

在两异型拱之间设置纵向连杆的异型拱桥设计思路,可更好地满足桥梁美学要求。通过南通机耕桥的工程实例计算,发现设置纵向连杆后,拱肋的结构内力发生较大变化,尤其是相连拱肋截面的剪力明显增大,同时全桥拱肋的面外稳定性有所减弱,但全桥整体刚度和自振频率得到提高。由此说明,该方法在异型拱桥的实际设计中是可以采用的。

The idea can meet with the bridge aesthetics better that is to install the longitudinal linkage between 2 special-shaped arches.Through the project calculation of Jigeng Bridge in Nantong,the structure internal force of arch rib was changed greatly,especially the shearing force of the contiguous arch rib sections was strengthened evidently after installing the longitudinal linkage.Meanwhile,the external stability of the whole arch rib was lowered but the total rigidity of the whole bridge and natural frequencies were improved.The results showed that the idea should be adopted in the practical design of special-shaped arch bridge.