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为研究双拱塔斜拉桥结构参数对桥梁动力特性的影响,以武汉科技三路桥为工程背景,基于Midas/Civil平台建立主桥空间有限元模型,采用多重Ritz向量法进行动力特性计算,分析了有无横撑、有无纵向拉索、结构自重、结构刚度、矢跨比等参数变化对该桥动力特性的影响。结果表明,该桥主要振型依次为拱塔扭转、主梁竖弯、主梁横弯振型。横撑对拱塔扭转振型频率影响较大;纵向拉索对各阶振型无影响;主梁自重对主梁竖弯、横弯振型频率影响显著,拱塔自重对拱塔扭转频率影响显著;拉索自重对各阶振型频率影响较小;结构刚度对各阶振型影响与结构自重影响相同;矢跨比对拱塔扭转振型频率影响较大。
In order to study the influence of structural parameters of double-arch bridge on the dynamic characteristics of bridges, the spatial finite element model of the main bridge was established based on the Midas / Civil platform with Wuhan Science and Technology Sanluqiao as an example. The dynamic characteristics of the bridge were calculated and analyzed by using multiple Ritz- The influence of the parameters such as whether there are bracing, whether longitudinal cable, structural weight, structural stiffness, ratio of pitch to span and so on on the dynamic characteristics of the bridge are studied. The results show that the main vibration modes of the bridge are in turn the arch tower torsion, the main beam vertical bending and the main beam transverse bending vibration mode. The transverse brace has a significant influence on the torsional vibration mode frequency of the arch tower. The longitudinal cable has no effect on the vibration modes of the arch towers. The influence of the main beam weight on the frequency of vertical bending and transverse bending modes of the main beam is significant. The effect of structural stiffness on the vibration modes of all modalities is the same as that of the structural self-weight. The ratio of pitch to span has a significant effect on the frequency of torsional vibration modes of the arch tower.