Graduate Thesis Or Dissertation
 

Seismic Performance of Aging Prestressed Transmission Pole with Simulated Soil Foundation

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/0k225d49f

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  • The Cascadia Subduction Zone has recently been identified as a source for an impending great earthquake. The potential of a large earthquake has created widespread interest into the resiliency of lifelines within the potentially affected areas. One critical lifeline is the electrical distribution and transmission systems which relies on legacy infrastructure components that were designed and constructed without regard to the seismic hazard. Of particular interest is the resiliency of prestressed concrete poles used for transmission towers within the region. Through material and structural testing of existing full scale specimens, moment capacities have been analyzed and compared to simulated earthquake moment demands. The structural testing allowed for an innovative solution to produce simulated site response through fabricating soil representative springs using steel plates. The soil simulated springs allowed for full scale testing with non-fixed base motions such as rotation and translation. After the conclusion of testing three different specimens, it was found that the poles remaining in the field are considerably vulnerable to site conditions but would structurally survive a subduction zone like earthquake.
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