汪至刚  楼文娟  孙炳楠  何  建
    （浙江大学土木系  杭州 310027）

[提要]  在分析拱桥结构构造特点的基础上，考虑了各种结构参数（结构及非结构质量的分布和偏心、结构刚度、边界条件等）对中承式拱桥的自振特性的影响，对宽翼T形板构成的桥面采用三种有限单元模型，建立了拱桥的空间三维计算模型，并将其应用于浙江省某大桥的动力特性的计算[门。通过对三种有限元建模方式的计算结果的比较，说明改进的鱼骨式单梁法应用于这种宽翼T形板组成的桥面是适用的。
[关键词]  拱桥  动力特性  有限单元模型

A detailed description of the development of finite element model for the analysis and the effect of structure parameters on the dynamic behavior, such as structure mass, eccentricity between the centroid and shear center, and support conditions are presented. The model frequencles and mode shapes computed by using three kinds of three-dimensional finite element models of long-span arch bridge are compared. Comparison shows that this kind of finite element advanced single-beam model is capable of capturing much of the complex dynamic behavior of long-span bridge with T-type bridge floor.
Keywords: arch bridge; dynamic characteristic; finite element model