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不規則高層混合結構整體模型模擬地震振動臺試驗研究

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

  • 摘要: 以廈門福隆大廈為背景,對不規則高層結構的1/20整體模型進行模擬地震振動臺試驗研究,測試了模型結構的動力特性、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應等,研究了模型結構的破壞機理和破壞模式.結果表明:模型結構前三階振型頻率依次為:1.74Hz(Y向平動)、2.28Hz(X向平動)和3.12Hz(整體扭轉),其中X向和Y向平動對應阻尼比分別為6.5%和6.3%.在7度多遇和罕遇地震作用下,X向結構最大層間位移角分別為1/956和1/147,Y向結構最大層間位移角分別為1/570和1/83.因此原型結構的布置基本合理,整體抗震性能較好.最后對原型結構的抗震設計方案提出了一些改進建議.

     

    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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