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FATIGUE BEHAVIOR IN REINFORCED ELECTRICAL ACCESS HOLES IN ALUMINUM LIGHT SUPPORT STRUCTURES

Rusnak, Cameron Robert
http://rave.ohiolink.edu/etdc/view?acc_num=akron1563273058988219

Abstract Details

2019, Master of Science in Engineering, University of Akron, Civil Engineering.
Aluminum light poles come in various shapes and sizes. These poles can vary in length and diameter, as well as the location of electrical access holes. They are usually constructed from an extruded aluminum tube. Given that the tubes are hollow, feature allows for the electrical wires to be hidden inside the pole. The electrical holes are placed near the base of the pole to make the wires accessible. Typically, the electrical access handhole is an opening cut in the pole and represents a loss of section. Due to this section loss, the handhole is reinforced. Reinforcing solves the issue related to loss of load capacity, but creates a potential location for fatigue cracking. The research was centered around how fatigue failure occurs in electrical reinforced handholes of two geometrically different aluminum poles. Most of the research was conducted using cyclical bending tests of the poles. Twenty one, ten inch poles and seven eight inch poles with electrical access handholes were tested in fatigue. The stress range that was applied varied from 80.2 Mpa (11.6 ksi) to 10 Mpa (1.45 ksi) at the lowest. Finite element analyses were conducted to aid in understanding the handhole failure. Typically, a longitudinal crack along the minor axis of the weld was observed, but there were a few specimens where the pole failed at the top or bottom of the handhole where the weld was terminated. This usually occurred in the eight inch specimens when tested at higher stress ranges. These cracks developed by incompatibility of the casting weld reinforcement and extruded tube, or to a potential shrinkage defect. The stress range versus number of cycles to failure (S-N curve) was plotted for the tests and compared to standard fatigue details categories for aluminum details. The majority of the data fell between categories C and D for aluminum as defined by the Aluminum Design Manual (“Aluminum” 2010). There were several outliers, however.
Craig Menzemer, PhD (Advisor)
David Roke, PhD (Committee Member)
Anil Patnaik, PhD (Committee Member)
52 p.
Civil Engineering

Recommended Citations

Citations

  • Rusnak, C. R. (2019). FATIGUE BEHAVIOR IN REINFORCED ELECTRICAL ACCESS HOLES IN ALUMINUM LIGHT SUPPORT STRUCTURES [Master's thesis, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1563273058988219

    APA Style (7th edition)

  • Rusnak, Cameron. FATIGUE BEHAVIOR IN REINFORCED ELECTRICAL ACCESS HOLES IN ALUMINUM LIGHT SUPPORT STRUCTURES . 2019. University of Akron, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1563273058988219.

    MLA Style (8th edition)

  • Rusnak, Cameron. "FATIGUE BEHAVIOR IN REINFORCED ELECTRICAL ACCESS HOLES IN ALUMINUM LIGHT SUPPORT STRUCTURES ." Master's thesis, University of Akron, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=akron1563273058988219

    Chicago Manual of Style (17th edition)

akron1563273058988219
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This open access ETD is published by University of Akron and OhioLINK.