Sensitivity investigation of modeling uncertainty for seismic demand analysis of bridges

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (24) : 257-264.

WU Wenpeng1,2,3, LI Lifeng2, TANG Shenghua1,3, ZHANG Xuhui1,3

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Abstract

In order to explore the impact of bridge modeling uncertainties on the seismic demand and improve the application of performance-based seismic design of bridges in practical engineering, a reinforced concrete continuous bridge consisting of four 30 m spans was taken as a case study.The OpenSEES software was applied to build a multiple dimension parameterized finite element model considering the uncertainties derived from structural material, boundary and the structure itself.Twenty two standardized far-fault ground motions were used to conduct the nonlinear time-history analysis.Based on the analysis results, the probabilistic stripe analysis method and the tornado diagram were adopted to investigate the sensitivity of various uncertainties.It is concluded that, the number of uncertainty parameters that affect the seismic demand prediction of the bridge is increased with earthquake intensity.The impact of the modeling uncertainties on the mean value (μ) and logarithmic standard deviation (ζ) is not consistent.Structural uncertainties have great impact on all engineering demand parameters, while the impact of the boundary uncertainty is dependent on different engineering demand parameter.Compared to the impact of the structural and boundary uncertainties, the impact of the material uncertainty is relatively less.

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bridge engineering / seismic demand / stripe analysis / modeling uncertainty / sensitivity

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WU Wenpeng1,2,3, LI Lifeng2, TANG Shenghua1,3, ZHANG Xuhui1,3. Sensitivity investigation of modeling uncertainty for seismic demand analysis of bridges[J]. Journal of Vibration and Shock, 2018, 37(24): 257-264

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