Modal identification of concrete dams based on strong-motion records and an ARMAV model

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Journal of Vibration and Shock ›› 2017, Vol. 36 ›› Issue (8) : 224-230.

CHENG Lin1,2,YANG Jie1,ZHENG Dongjian2,REN Jie1

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Abstract

It is a feasible way to study the dynamic properties of concrete hydraulic structures through modal identification using the vibration measurement of structures.In this paper,an auto-regressive moving average vector (ARMAV) model and stabilization diagram method was adopted to perform modal identification using the strong-motion observation of concrete dams.The vibration response time series were expressed by the ARMAV model at first,and the instrumental variable (IV) technique was adopted to improve estimation accuracy of unknown model coefficients.Then the relationship between the ARMAV model coefficient matrix and structural state space matrix was studied to provide theoretical basis for modal identification.The stabilization diagram was improved by the average normalized power spectrum density function,which integrated the modal information of all the measurement channels,to the determine system order and remove spurious modes.A numerical example and a practical engineering application were used to verify the accuracy,effectiveness and applicability of the proposed modal identification method based on strong-motion observation and the ARMAV model.

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strong-motion observation / modal identification / auto-regressive moving average vector / instrumental variable / average normalized power spectrum density

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CHENG Lin1,2,YANG Jie1,ZHENG Dongjian2,REN Jie1. Modal identification of concrete dams based on strong-motion records and an ARMAV model[J]. Journal of Vibration and Shock, 2017, 36(8): 224-230

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