多高层结构的鞭梢效应研究

Study on Whiplash Effect of High-rise Building

对具有突出物的多层框架和框剪结构建立了力学模型,探讨了结构产生鞭梢效应的原因,并推导了突出物顶部振型位移和主体顶部振型位移的比值公式。通过实例分析发现,突出物的质量和刚度都影响着突出物鞭梢效应的强弱,特征刚度值是框架-剪力墙结构产生鞭梢效应的另一个重要影响因素。因此可通过适当调整结构的刚度或质量分布使突出物的频率与整体结构的频率的差值增大,对框架-剪力墙结构还可以调整特征刚度比值来减小鞭梢效应。

The mechanical model of high-rise building with prominent part on its top is proposed. The reason of the whiplash effect on the building with prominent part is discussed. The ratio of mode displacement at the top of structure＇ s prominent part to mode displacement at the top of structure＇s main pact is given. Based on the case, it is known that both mass and stiffness of the prominent part affect the whiplash effect, and characteristic stiffness is another important factor which affects the whiplash effect of the frame-shear wall structure.