吴广珊
    （烟台大学土木系 烟台 264005）

[提要]  钢筋砼电视塔为自立式高柔伸臂结构，在地震反应中，高振型的影响不容忽视。为从量上把握高振型的影响程度，本文采用基于振型叠加法的结构地震响应历程分析方法，分析了各阶振型尤其是高振型在响应时程内对结构总反应的贡献。结果表明：十阶以内的振型对结构地震反应的影响不容忽视，十阶以后的高振型则影响甚微。
[关键词]  钢筋砼电视塔 高振型 地震反应

R.C.TV tower is a special structure which is much more slender than general high-rise building structure. The influence of high modes of the structure will be remarkable. For studying the influence
degrees, this paper uses the direct dynamic analysis method of structural seismic response which is based on the mode-superposition and investigates the contributions of every mode of the structure to seismic response, specially the contributions of high modes. The analysis results indicate that the contributions of the first ten modes should not be neglected and the contributions of the other modes are negligible.
Keywords: R.C.TV tower; high modes; seismic response