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提出了一种利用子结构振动台试验近似模拟高层建筑长周期地震反应的改进方法。通过在子结构模型底部设置橡胶垫-质量块装置产生放大作用来弥补现有振动台的试验能力,通过定义传递函数和整体结构目标加速度反应卷积来反推子结构模型的新输入地震动,基于SAP2000软件分别进行20层整体结构模型和2层子结构模型地震线性时程反应分析。对比结果表明,不同地震作用下,两者的顶层目标加速度反应符合较好。研究成果对于拓展地震模拟振动台空间尺度和负载应用方面有一定的参考意义,为长周期作用下高层建筑反应模拟提供一种新的研究方法。
An improved method of simulating the long-period seismic response of high-rise buildings using the substructure shaking table test is proposed. The new input ground motion of the substructural model is deduced by defining the transfer function and the convolution of the target acceleration response of the overall structure by amplifying the rubber pad-mass device at the bottom of the substructure model to make up the experimental capability of the existing vibration table. Based on SAP2000 software, the seismic linear time history response analysis of 20-layer monolithic structure model and 2-layer substructure model are respectively carried out. The comparison results show that the top-level acceleration responses of the two are in good agreement with the different earthquakes. The research results have certain reference meaning for expanding the space scale and load application of seismic shaker, and provide a new research method for the simulation of tall buildings under long period.