周晓峰    董石麟
    （浙江大学土木系  杭州 310027）

[提要]  对巨型钢框架这种新颖的结构体系进行自振特性的研究，不仅可以判断结构质量和刚度是否匹配，刚度是否合理，还可以对结构在承受诸如风、地震等动力作用时的基本受力性能有全面的了解。针对日本神户TC大厦的工程实例，通过不同的计算模式对其进行计算，并详细、深入地比较了五种计算模式假定下的计算结果。为进一步研究不同的设计参数取值对计算结果的影响，系统分析了巨型梁、柱构件截面、巨型梁布置位置和布置个数等参数发生变化时各阶振型、频率的变化趋势，其结果对工程设计能起到借鉴的作用。
[关键词]  巨型钢框架  白振特性  振型  频率

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