A method of modal parameters identification using ambient vibration measurements for large-scale bridges

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Journal of Vibration and Shock ›› 2012, Vol. 31 ›› Issue (2) : 95-100.

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A method of modal parameters identification using ambient vibration measurements for large-scale bridges

QIN Shi-qiang, PU Qian-hui, SHI Zhou

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Abstract

A method to identify modal parameters of large-scale bridge using structure ambient vibration responses is proposed. The method is based on bandwidth restricted empirical mode decomposition (BREDM) and stochastic subspace identification (SSI), first several intrinsic mode functions (IMF) which only represent one frequency component are obtained through EMD, then SSI is used to identify modal parameters. For the features of low natural frequencies and closely spaced mode of large-scale bridge, masking signal is introduced to restrict the EMD bandwidth to eliminate mode mixing. The method is used to identify modal parameters of a large bridge in Gan-Long rail, and the results is compared with Peak Picking method、SSI and finite element analysis, which shows: The method proposed can effectively identify large-scale bridge modal parameters, masking signal solved the problem of mode mixing during EMD, and the false modes in stabilization diagram are restrained.

Key words

bridge / bandwidth restricted empirical mode decomposition (BREMD) / stochastic subspace identification (ssi) / masking signal / ambient excitation / modal parameters identification / mode mixing

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QIN Shi-qiang;PU Qian-hui;SHI Zhou. A method of modal parameters identification using ambient vibration measurements for large-scale bridges[J]. Journal of Vibration and Shock, 2012, 31(2): 95-100