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Structural Assessment of Highway "N" Power Substation under Earthquake Loads
Civil, Architectural and Environmental Engineering Faculty Research & Creative Works
  • Genda Chen, Missouri University of Science and Technology
  • Dongming Yan
  • Zuocai Wang
  • Seth Justin
  • J. David Rogers, Missouri University of Science and Technology
  • Kazi Rezaul Karim

In this study, the Highway N Substation was analyzed with a finite element model (FEM) for its vulnerability. The 'rigid' bus and electric switch components were characterized with full scale shake table tests. Each component of the substation was carefully modeled with due considerations of mass density, stiffness and geometries. Based on the FEM, modal analysis was conducted to identify the natural frequencies of the structure along with their corresponding mass participation factors. In response spectrum and time history analyses, the dynamic responses of main components, such as 'rigid' buses and switches, were evaluated. The magnitude and location of the maximum moments were identified. The shake table tests on three Turner Electric's TMX switches indicated that the first three natural frequencies of the switches are approximately 7.41 Hz, 15.2 Hz and 22.9 Hz, respectively. They are significantly higher than their corresponding frequencies of the entire substation system. The tested switches consistently fractured at the base of their metal shaft, a critical component of the switch open-and-close mechanism, due to stress concentration and local manufacture defect.

Civil, Architectural and Environmental Engineering
Second Department
Geosciences and Geological and Petroleum Engineering
United States. Department of Transportation
Research and Innovative Technology Administration (RITA)
United States Department of Transportation Grant No. DTRT06-G-0014
Keywords and Phrases
  • Power substation,
  • finite element model,
  • modal analysis,
  • response spectrum analysis,
  • time history analysis,
  • shake table test
Report Number
NUTC-R213 & NUTC-R228
Document Type
Technical Report
Document Version
Final Version
File Type
© 2009 Center for Transportation Infrastructure and Safety/NUTC program, Missouri University of Science and Technology, All rights reserved.
Publication Date
Publication Date
01 Oct 2009
Citation Information
Genda Chen, Dongming Yan, Zuocai Wang, Seth Justin, et al.. "Structural Assessment of Highway "N" Power Substation under Earthquake Loads" (2009)
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