斜靠式拱桥拱肋倾角变化对稳定性能的影响

Variational sloping angle of arch rib influenced on the stability of double X-shaped arch bridge

采用有限元软件MIDAS／Civil建立平顶山市城东河路湛河斜靠式拱桥的空间有限元计算模型，分7种设计方案探讨斜靠式拱桥主拱和稳定拱肋的倾角变化对桥梁稳定性能的影响。计算结果表明，斜靠式拱桥的稳定性能较好，各方案的稳定系数均大于7；主拱肋倾角的增大有利于提高斜靠式拱桥低阶稳定性能；稳定拱肋倾角的增大不利于提高斜靠式拱桥稳定性能，在进行斜靠式拱桥设计时稳定拱肋的倾角不宜太大，以8°～10°为宜。

The three dimensional finite element calculating model of the main bridge of Zhanhe Bridge over the Chengdong- River Road in Pingdingshan city was established by using the software MIDAS/Civil. Seven design proposals were used to study the variational sloping angle of arch rib influenced on the stability of double X - shaped arch bridge. The results indicate that the stability of the double X - shaped arch bridge is well and the stability factor of each proposal are all bigger than 7. The augmentation of the main arch rib＇ s sloping angle is benefit to improving the lower order stability property of the double X - shaped arch bridge. On the contrary, the augmentation of the stable arch rib＇s sloping angle is not benefit to improving the stability. So, when designing the double X - shaped arch bridge, the sloping angle of the stable arch rib is unsuitable to be too big and from 8° to 10° is the best.