Mr. Jie Wu Profile

Jie Wu

at South China Univ of Technology

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Proceedings Article | 1 April 2016 Paper

Geometry control of long-span continuous girder concrete bridge during construction through finite element model updating

Jie Wu, Quan-sheng Yan, Jian Li, Min-yi Hu

Proceedings Volume 9805, 98052U (2016) https://doi.org/10.1117/12.2219477

KEYWORDS: Bridges, Finite element methods, Data modeling, Phase measurement, Matrices, Statistical modeling, Genetic algorithms, Statistical analysis, Correlation function, Systems modeling

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In bridge construction, geometry control is critical to ensure that the final constructed bridge has the consistent shape as design. A common method is by predicting the deflections of the bridge during each construction phase through the associated finite element models. Therefore, the cambers of the bridge during different construction phases can be determined beforehand. These finite element models are mostly based on the design drawings and nominal material properties. However, the accuracy of these bridge models can be large due to significant uncertainties of the actual properties of the materials used in construction. Therefore, the predicted cambers may not be accurate to ensure agreement of bridge geometry with design, especially for long-span bridges. In this paper, an improved geometry control method is described, which incorporates finite element (FE) model updating during the construction process based on measured bridge deflections. A method based on the Kriging model and Latin hypercube sampling is proposed to perform the FE model updating due to its simplicity and efficiency. The proposed method has been applied to a long-span continuous girder concrete bridge during its construction. Results show that the method is effective in reducing construction error and ensuring the accuracy of the geometry of the final constructed bridge.

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