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根据振动系统传递特性,提出一种新的环境振动预测方法——实测脉冲传递函数预测方法。通过脉冲试验测得振源与邻近建筑物内测点的振动加速度,计算得到振动系统的振动响应传递函数;将实测的地铁运营振源的振动加速度代入传递函数公式,实现对建筑物内测点的振动加速度时程、频谱、1/3倍频程和z振级的预测。应用该方法预测隧道中心楼内测点振动加速度结果表明:隧道结构与隧道中心楼内测点振动加速度传递函数峰值频段为30～50Hz,隧道中心楼内振动加速度峰值频段为40～60Hz;土层和隧道中心楼基础结构对60Hz以上频段的振动具有很强的衰减作用,楼房基础结构有效地隔断了70Hz以上的高频振动。该方法可用于预测地铁运营引起的建筑物内振动。
According to the transmission characteristics of the vibration system, a new method of environmental vibration prediction is proposed, which is the method of forecasting the pulse transfer function. Through the pulse test, the vibration acceleration of the vibration source and the measuring point in the adjacent building was measured, and the vibration response transfer function of the vibration system was calculated. The measured vibration acceleration of the subway operating vibration source was substituted into the transfer function formula, Vibration acceleration time history, spectrum, 1/3 octave and z-level prediction. The results show that: the peak frequency band of the vibration acceleration transfer function at the measuring point of tunnel structure and tunnel center building is 30 ~ 50Hz, the peak frequency band of vibration acceleration in the center of tunnel is 40 ~ 60Hz; And the tunnel center floor infrastructure on the 60Hz frequency band above the vibration attenuation has a strong effect, building the basic structure effectively cut off more than 70Hz high-frequency vibration. This method can be used to predict the vibration in buildings caused by subway operation.