基于模态测试的宽幅钢箱梁桥有限元模型建立、修正与分析

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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.

Key words： wide steel box-girder bridge modal test finite element model model updating dynamic characteristics

Received: 13 July 2016 Published: 28 December 2017

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	Articles by authors
	XIE Weiping1
	CAO Xiaoyu1
	Xiao Boqiang2
	Liu Haiqing2

Cite this article:

XIE Weiping1,CAO Xiaoyu1,Xiao Boqiang2, et al. 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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http://jvs.sjtu.edu.cn/EN/ OR http://jvs.sjtu.edu.cn/EN/Y2018/V37/I1/98

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