Earthquakes and Structures

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An improved approach for multiple support response spectral analysis of a long-span high-pier railway bridge

  • Li, Lanping (Department of Civil Engineering, Southwest Jiaotong University) ;
  • bu, Yizhi (Department of Civil Engineering, Southwest Jiaotong University) ;
  • Jia, Hongyu (Department of Civil Engineering, Southwest Jiaotong University) ;
  • Zheng, Shixiong (Department of Civil Engineering, Southwest Jiaotong University) ;
  • Zhang, Deyi (Department of Civil Engineering, Southwest Jiaotong University) ;
  • Bi, Kaiming (Center for Infrastructure Monitoring and Protection, School of Civil Engineering and Mechanics, Curtin University)
  • Published : 2017.08.25
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Abstract

To overcome the difficulty of performing multi-point response spectrum analysis for engineering structures under spatially varying ground motions (SVGM) using the general finite element code such as ANSYS, an approach has been developed by improving the modelling of the input ground motions in the spectral analysis. Based on the stochastic vibration analyses, the cross-power spectral density (c-PSD) matrix is adopted to model the stationary SVGM. The design response spectra are converted into the corresponding PSD model with appropriate coherency functions and apparent wave velocities. Then elements of c-PSD matrix are summarized in the row and the PSD matrix is transformed into the response spectra for a general spectral analysis. A long-span high-pier bridge under multiple support excitations is analyzed using the proposed approach considering the incoherence, wave-passage and site-response effects. The proposed approach is deemed to be an efficient numerical method that can be used for seismic analysis of large engineering structures under SVGM.

Keywords

Acknowledgement

Supported by : National Science Foundation of China

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