不规则高层混合结构整体模型模拟地震振动台试验研究

Shaking table testing study on the integrated model of a high-rise hybrid building structure with irregularity

  • 摘要: 以厦门福隆大厦为背景,对不规则高层结构的1/20整体模型进行模拟地震振动台试验研究,测试了模型结构的动力特性、阻尼比及其在7度多遇、7度基本、7度罕遇烈度地震作用下的加速度和位移反应等,研究了模型结构的破坏机理和破坏模式.结果表明:模型结构前三阶振型频率依次为:1.74Hz(Y向平动)、2.28Hz(X向平动)和3.12Hz(整体扭转),其中X向和Y向平动对应阻尼比分别为6.5%和6.3%.在7度多遇和罕遇地震作用下,X向结构最大层间位移角分别为1/956和1/147,Y向结构最大层间位移角分别为1/570和1/83.因此原型结构的布置基本合理,整体抗震性能较好.最后对原型结构的抗震设计方案提出了一些改进建议.

     

    Abstract: A shaking table testing study on a 1/20 scale model of a hybrid high-rise building with irregularity was carried out with the Fulong Building in Xiamen as the project background. In the test, the model's dynamic properties, damp ratio, as well as the reaction of acceleration and deformation in frequent earthquake, basic seismic intensity and rare earthquake of 7 degree were examined, and the cracking pattern and failure mechanism of the model were studied. The result of this test demonstrates that the frequencies of the first three modes of the model are 1.74Hz (Y direction translation), 2.28Hz (X direction translation) and 3.12Hz (over rotation), and the damp ratio corresponded to X direction and Y direction is 6.3% and 6.5% respectively. Under the function of frequent earthquake and rare earthquake, the maximum story drift angle of the prototype in X direction is 1/956 and 1/147 respectively, and in Y direction is 1/570 and 1/83 respectively. Therefore a rational arrangement of structural elements with good overall anti-seismic behavior was presented. Finally, some suggestions for the seismic design of the structure are put forward in this paper.

     

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