蝴蝶拱桥稳定性多参数影响研究

以某蝴蝶拱桥为工程背景,建立该桥的空间有限元计算模型,分4个工况计算了该桥的稳定安全系数。通过改变拱肋外倾角度、拱肋刚度、端横梁刚度以及吊杆布置形式计算了不同设计参数下结构在恒载工况以及恒载+活载工况的失稳特征值。结果表明,拱肋的刚度对稳定性起着决定性作用;吊杆的布置形式只改变拱肋的面内刚度,对于面外刚度没有影响。

Research on Multi-Parameter of Butterfly Arched Bridge Stability

Taking some butterfly arched bridge as the engineering background,the study establishes the spatial finite element computation model of the bridge,and the stability safety index is calculated in four kinds of construction conditions.Through the change of arch rib camber angle,rigidity of the arch rib,the end beam rigidity as well as the arrangement of suspension bar,imbalance eigen values of the structure are calculated in the dead load operating mode as well as the dead load+live load operating mode.The result indicates that,the arch rib rigidity plays a decisive role in the stability;The suspension bar arrangement only changes the arch rib in plane rigidity and has nothing to do without plane rigidity.