大跨径钢管混凝土拱桥结构稳定与动力性能研究

为研究大跨径钢管混凝土拱桥结构稳定与动力性能,以某竖直双吊杆简支拱为工程背景,从拱桥吊杆设计形式和不同动力模型角度出发,研究系杆拱桥影响线特征以及不同列车激励下对桥跨结构的冲击系数.利用有限元软件ANSYS与UM(Uni-versal Mechanism)动力学分析软件联合建模,进行仿真分析.结果表明:斜吊杆拱、网状吊...

Study on structural stability and dynamic performance of concrete-filled steel tubular arch bridge with long span

In order to study the structural stability and dynamic performance of concrete-filled steel tubular arch bridge with long span,taking a vertical double-suspender simply supported arch as the engineering background,the influence line characteristics of tied arch bridge and the impact coefficients of bridge span structure under different train excitation were studied from the perspectives of suspender design form of arc bridge and different dynamic models.The finite element software ANSYS and UM (Universal Mechanism) dynamic analysis software were used for joint modeling and simulation analysis.The results showed that the inclined suspender arch and mesh suspender arch had high rigidity and good flexural performance.In the three kinds of suspender design,the stability coefficient of mesh suspender arch was relatively larger.The faster the running speed of train,the greater the impact coefficient on the bridge span structure.The impact coefficient caused by single locomotive was greater than that caused by marshalling EMU,and the impact coefficient decreased with the increase of train mass.The research results can provide reference for the bridge type selection in design stage.