Complex mode pseudo excitation method for random seismic response analysis of isolated bridge structures

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (23) : 160-164.

JIA Shaomin1, CHEN Huating2, WANG Ziqi2, ZHAO Lei3

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Abstract

Due to the constitutive relation of isolation bearing having significant non-linearity, nonlinear random seismic response analysis of isolated bridge structures has difficulties of complex theory and large amount of calculation.Here, to simplify analysis process and improve computational efficiency, the equivalent linear model of isolated bridge structures was established and the non-classical damping model was adopted to describe damping characteristics of isolated bridge structures.Based on the complex mode superposition method and the pseudo excitation method, the complex mode pseudo excitation method for random seismic response analysis of isolated bridge structures was established.Numerical examples showed that the established method has high computational efficiency, reliable results and convenient operation.

Key words

isolated bridge / isolation bearing / pseudo excitation method / complex mode superposition method / non-classical damping / equivalent linearization

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JIA Shaomin1, CHEN Huating2, WANG Ziqi2, ZHAO Lei3. Complex mode pseudo excitation method for random seismic response analysis of isolated bridge structures[J]. Journal of Vibration and Shock, 2020, 39(23): 160-164

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