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首页> 外文期刊>International Journal of Sustainable Materials and Structural Systems >Modal identification of seismically isolated bridges with piers having different heights
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Modal identification of seismically isolated bridges with piers having different heights

机译：墩高不同的地震隔离桥梁的模态识别

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This paper investigates the modal identification of seismically isolated bridges when the localised nonlinear behaviour from the isolation bearing initiates at different times due to the uneven height of the bridge piers. More specifically, a three-span bridge supported on spherical sliding bearings is examined. Three different states of the same system with different natural periods emerge during an excitation; the linear system (LS), the partially isolated system (PIS) and the fully isolated system (FIS). Firstly, the paper identifies the time intervals that each state performs by using acceleration data. Subsequently, modal identification techniques such as the prediction error method and a time-frequency wavelet analysis are applied on each interval. The LS' results are dependable compared to the PIS which is a mildly nonlinear system. The results corresponding to the FIS suggest that it is preferable to apply the modal identification techniques on each interval independently, rather than on the entire response signal.
机译：本文研究了由于桥墩高度不均匀而在不同时间启动隔震支座的局部非线性行为时，隔震桥梁的模态识别。更具体地，研究了支撑在球形滑动轴承上的三跨度桥梁。同一系统具有不同自然周期的三种不同状态会在激发过程中出现。线性系统（LS），部分隔离系统（PIS）和完全隔离系统（FIS）。首先，本文利用加速度数据确定每个状态执行的时间间隔。随后，在每个间隔上应用模态识别技术，例如预测误差方法和时频小波分析。与PIS相比，LS的结果是可靠的，PIS是一个轻度非线性的系统。对应于FIS的结果表明，最好将模态识别技术独立应用于每个间隔，而不是应用于整个响应信号。

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