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Earthquakes and Structures Volume 13, Number 2, August 2017 , pages 193-200 DOI: https://doi.org/10.12989/eas.2017.13.2.193 |
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An improved approach for multiple support response spectral analysis of a long-span high-pier railway bridge |
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Lanping Li, Yizhi bu, Hongyu Jia, Shixiong Zheng,Deyi Zhang and Kaiming Bi
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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. | ||
| Key Words | ||
| response spectral analysis; multiple support excitation; stochastic vibration analysis; high-pier railway bridge; seismic spatial variability | ||
| Address | ||
| Lanping Li, Yizhi bu, Hongyu Jia, Shixiong Zheng and Deyi Zhang: Department of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China Hongyu Jia: The Key Laboratory of Urban Security and Disaster Engineering, Beijing University of Technology, Beijing 100124, China Kaiming Bi: Center for Infrastructure Monitoring and Protection, School of Civil Engineering and Mechanics, Curtin University, Kent St, Bentley, WA 6102, Australia | ||