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University of Akron

1. Rusnak, Cameron Robert. FATIGUE BEHAVIOR IN REINFORCED ELECTRICAL ACCESS HOLES IN ALUMINUM LIGHT SUPPORT STRUCTURES.

Degree: MSin Engineering, Civil Engineering, 2019, University of Akron

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. Advisors/Committee Members: Menzemer, Craig (Advisor).

Subjects/Keywords: Civil Engineering

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Rusnak, C. R. (2019). FATIGUE BEHAVIOR IN REINFORCED ELECTRICAL ACCESS HOLES IN ALUMINUM LIGHT SUPPORT STRUCTURES. (Masters Thesis). University of Akron. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=akron1563273058988219

Chicago Manual of Style (16th Edition):

Rusnak, Cameron Robert. “FATIGUE BEHAVIOR IN REINFORCED ELECTRICAL ACCESS HOLES IN ALUMINUM LIGHT SUPPORT STRUCTURES.” 2019. Masters Thesis, University of Akron. Accessed September 21, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=akron1563273058988219.

MLA Handbook (7th Edition):

Rusnak, Cameron Robert. “FATIGUE BEHAVIOR IN REINFORCED ELECTRICAL ACCESS HOLES IN ALUMINUM LIGHT SUPPORT STRUCTURES.” 2019. Web. 21 Sep 2019.

Vancouver:

Rusnak CR. FATIGUE BEHAVIOR IN REINFORCED ELECTRICAL ACCESS HOLES IN ALUMINUM LIGHT SUPPORT STRUCTURES. [Internet] [Masters thesis]. University of Akron; 2019. [cited 2019 Sep 21]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=akron1563273058988219.

Council of Science Editors:

Rusnak CR. FATIGUE BEHAVIOR IN REINFORCED ELECTRICAL ACCESS HOLES IN ALUMINUM LIGHT SUPPORT STRUCTURES. [Masters Thesis]. University of Akron; 2019. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=akron1563273058988219

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