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    汪至剛  樓文娟  孫炳楠  何  建
    （浙江大學(xué)土木系  杭州 310027）

[提要]  在分析拱橋結(jié)構(gòu)構(gòu)造特點(diǎn)的基礎(chǔ)上，考慮了各種結(jié)構(gòu)參數(shù)（結(jié)構(gòu)及非結(jié)構(gòu)質(zhì)量的分布和偏心、結(jié)構(gòu)剛度、邊界條件等）對(duì)中承式拱橋的自振特性的影響，對(duì)寬翼T形板構(gòu)成的橋面采用三種有限單元模型，建立了拱橋的空間三維計(jì)算模型，并將其應(yīng)用于浙江省某大橋的動(dòng)力特性的計(jì)算[門。通過對(duì)三種有限元建模方式的計(jì)算結(jié)果的比較，說明改進(jìn)的魚骨式單梁法應(yīng)用于這種寬翼T形板組成的橋面是適用的。
[關(guān)鍵詞]  拱橋  動(dòng)力特性  有限單元模型

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