Finite element modeling, modification and analysis for wide steel box-girder bridges , based on modal tests

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (1) : 98-105.

XIE Weiping1 , CAO Xiaoyu1, Xiao Boqiang2, Liu Haiqing2

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Abstract

An accurate finite element model for wide steel box-girder bridges is very important for the evaluation of structural dynamic performance and the structural design. A sophisticated finite element model was presented for a certain wide steel box-girder bridge. Modal tests in various stages of construction were carried out based on the field ambient vibration excitation. The stochastic subspace identification and peak picking of the average normalized power spectral densities were used to identify the bridge’s dynamic characteristics. The response surface method based on the dynamic characteristics identification was adopted to update the FEM. And the influences of the paving, equivalent masses of adjacent bridges on the bridge’s natural frequencies were discussed. The results show that the FEM established is quite accurate, the paving will lead to the huge decrease of natural frequency, and equivalent masses of adjacent bridges have significant effect on the lateral and torsional frequencies.

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wide steel box-girder bridge / modal test / finite element model / model updating / dynamic characteristics

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XIE Weiping1,CAO Xiaoyu1, Xiao Boqiang2, Liu Haiqing2 . Finite element modeling, modification and analysis for wide steel box-girder bridges , based on modal tests[J]. Journal of Vibration and Shock, 2018, 37(1): 98-105

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