A study on the higher mode effect of rocking self-centering tall piers

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (24) : 66-71.

ZHANG Yuzhi

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Abstract

In order to control the higher mode effect on rocking self-centering tall piers, the contribution of higher mode should be assessed quantitatively.Based on comparison of current research methods, a mode decomposition method was adopted to calculate the contribution of higher mode for rocking self-centering tall piers.A new index that can be used to assess the contribution of higher mode during rocking was put forward based on the analysis of current various indexes.Using seven ground motion records for three different intensities as input, the higher mode contribution of a rocking self-centering tall railway bridge pier was studied with two springs rocking model built in OpenSEES.Results show that higher mode contribution increases with the ground motion intensity.Base shear is the most sensitive structural response to higher mode effect and the contribution of the second and third mode is 97% and 27% of the first mode.The contribution of the second mode to the base moment is 34% of the first mode.Pier top displacement is not sensitive to higher mode.The contribution of the second mode to pier top displacement is only 8% of the first mode.

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rocking self-centering tall pier / higher mode effect / mode decomposition method

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ZHANG Yuzhi. A study on the higher mode effect of rocking self-centering tall piers[J]. Journal of Vibration and Shock, 2018, 37(24): 66-71

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