Effect of non-stationary spatially varying ground motions on the seismic responses of multi-support structures

Zhaoheng Xu, Tian Li Huang, Kaiming Bi

Research output: Journal article publicationJournal articleAcademic researchpeer-review


Previous major earthquakes indicated that the earthquake induced ground motions are typical non-stationary processes, which are non-stationary in both amplification and frequency. For the convenience of aseismic design and analysis, it usually assumes that the ground motions at structural supports are stationary processes. The development of time-frequency analysis technique makes it possible to evaluate the non-stationary responses of engineering structures subjected to nonstationary inputs, which is more general and realistic than the analysis method commonly used in engineering. In this paper, the wavelet-based stochastic vibration analysis methodology is adopted to calculate the non-stationary responses of multi-support structures. For comparison, the stationary response based on the standard random vibration method is also investigated. A frame structure and a two-span bridge are analyzed. The effects of non-stationary spatial ground motion and local site conditions are considered, and the influence of structural property on the structural responses are also considered. The analytical results demonstrate that the non-stationary spatial ground motions have significant influence on the response of multi-support structures.

Original languageEnglish
Pages (from-to)325-341
Number of pages17
JournalStructural Engineering and Mechanics
Issue number3
Publication statusPublished - 10 May 2022
Externally publishedYes


  • non-stationary process
  • seismic analysis
  • spatially varying ground motions
  • stationary process

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Mechanics of Materials
  • Mechanical Engineering


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