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    周曉峰    董石麟
    （浙江大學(xué)土木系  杭州 310027）

[提要]  對(duì)巨型鋼框架這種新穎的結(jié)構(gòu)體系進(jìn)行自振特性的研究，不僅可以判斷結(jié)構(gòu)質(zhì)量和剛度是否匹配，剛度是否合理，還可以對(duì)結(jié)構(gòu)在承受諸如風(fēng)、地震等動(dòng)力作用時(shí)的基本受力性能有全面的了解。針對(duì)日本神戶TC大廈的工程實(shí)例，通過不同的計(jì)算模式對(duì)其進(jìn)行計(jì)算，并詳細(xì)、深入地比較了五種計(jì)算模式假定下的計(jì)算結(jié)果。為進(jìn)一步研究不同的設(shè)計(jì)參數(shù)取值對(duì)計(jì)算結(jié)果的影響，系統(tǒng)分析了巨型梁、柱構(gòu)件截面、巨型梁布置位置和布置個(gè)數(shù)等參數(shù)發(fā)生變化時(shí)各階振型、頻率的變化趨勢(shì)，其結(jié)果對(duì)工程設(shè)計(jì)能起到借鑒的作用。
[關(guān)鍵詞]  巨型鋼框架  白振特性  振型  頻率

For the steel mega-frame, analyzing its dynamical properties can not only judge its rigid degree, but also estimate its overall behaviors under wind or seismic loads excitation. At first, five dynamical analytical models are presented. Secondly, by calculating a typical example, some different results caused by different models are obtained, and compared carefully. Moreover, after having changed some parameters,such as the sections of huge-beams and huge-columns, the huge-beams's location or number, etc, the natural frequencies and vibration modes for different parameters have been discussed. At last, suggestions for the design of mega-frame are given.
Keywords: steel mega-frame; dynamical properties; vibration modes; natural frequency