弯曲型结构简化动力模型分析及TMD减振设计

采用等效刚度参数识别法对某高层建筑主体结构进行模型简化。对比了简化模型和ETABS原模型的动力特性和包括地震作用的多种激励下的结构响应。为了说明在高层建筑结构动力分析中使用正确模型的重要性,对剪切型模型和弯曲型模型的固有频率和振型进行了对比分析。以弯曲型模型和剪切型模型为基础,进行了调谐质量阻尼器(简称TMD)减振设计,将所得TMD附加于弯曲型主体结构,并对比结构的位移响应。结果表明,剪切型结构和弯曲型结构的动力响应存在较大差异,而弯曲型简化模型能准确地代表原模型,故不建议或者应谨慎使用剪切型模型对高层建筑结构进行减振装置设计。

A Dynamic Analysis of Condensed Model and Tuned Mass Damper Design for Curved Structures

The equivalent stiffness identification method has been used to simplify the model of a high-rise primary structure. A comparison has been made of the dynamic characteristics of the simplified model and the original model of ETABS, followed by a comparison between the structural response under various excitations including earthquake action as well. In order to illustrate the importance of utilizing the correct model for the high-rise structure in the dynamic analysis, a comparison and an analysis have been made of the natural frequency and mode shape of shear-typed model and curved model. TMD is to be designed based on the curved model and the shear-typed model, to be added to the curved primary structure, with the displacement response of the structure also compared. The results show that the dynamic response of the shear-typed structure is quite different from that of the curved structure. With the simplified model of curved structure accurately representing the original model, the shear-typed model is not recommended or at least should be used with caution in the structural control design for high-rise buildings.