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    吳廣珊
    （煙臺(tái)大學(xué)土木系 煙臺(tái) 264005）

[提要]  鋼筋砼電視塔為自立式高柔伸臂結(jié)構(gòu)，在地震反應(yīng)中，高振型的影響不容忽視。為從量上把握高振型的影響程度，本文采用基于振型疊加法的結(jié)構(gòu)地震響應(yīng)歷程分析方法，分析了各階振型尤其是高振型在響應(yīng)時(shí)程內(nèi)對(duì)結(jié)構(gòu)總反應(yīng)的貢獻(xiàn)。結(jié)果表明：十階以?xún)?nèi)的振型對(duì)結(jié)構(gòu)地震反應(yīng)的影響不容忽視，十階以后的高振型則影響甚微。
[關(guān)鍵詞]  鋼筋砼電視塔 高振型 地震反應(yīng)

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