Structural Assessment of Highway "N" Power Substation under Earthquake Loads

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.

  • Record URL:
  • Supplemental Notes:
    • This research was sponsored by the U.S. Department of Transportation, University Transportation Centers Program.
  • Corporate Authors:

    Center for Transportation Infrastructure and Safety

    University Missouri - Rolla, Civil Engineering - UMR
    325 Butler-Carlton Hall
    Rolla, MO  United States  65409

    Research and Innovative Technology Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • Chen, Genda
    • Yan, Dongming
    • Wang, Zuocai
    • McConnell, Seth Justin
    • Rogers, David
    • Karim, Kazi R
  • Publication Date: 2009-10


  • English

Media Info

  • Media Type: Web
  • Edition: Final Report
  • Features: Figures; Photos; References; Tables;
  • Pagination: 58p

Subject/Index Terms

Filing Info

  • Accession Number: 01153170
  • Record Type: Publication
  • Report/Paper Numbers: NUTC R213; NUTC R228, Report No. 00019054; Report No. 00022574
  • Contract Numbers: DTRT06-G-0014 (Grant)
  • Files: UTC, TRIS, USDOT
  • Created Date: Mar 23 2010 12:59PM