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Parametric Study of Fatigue in Light Pole Structures

Hosseini, Maryam Sadat
http://rave.ohiolink.edu/etdc/view?acc_num=akron1374530021

Abstract Details

2013, Master of Science in Engineering, University of Akron, Civil Engineering.
ABSTRACT The fatigue behavior of light pole structures under wind loadings (specifically, wind gust) were studied. Fatigue failures have occurred in luminaire structures as a result of wind-induced vibration under severe environmental conditions. The increasing number of failures is due to vibration near the fundamental mode and lack of appropriate damping and motion control. In some sense the problem has been exacerbated because the majority of fatigue design specifications were established prior to 2001. As a result, the 4th edition of the AASHTO Standard Specifications for Structural Supports for Highway Signs, Luminaries and Traffic Signals now provide clear design criteria that incorporate loading conditions and connection detail categories. Initiative for the study was the occurrence of failures due to rapid fatigue resulting from wind induced vibration. Several failures have been associated with welded hand- hole details that have not been the subject of comprehensive experimental studies. As a result there is a lack of available data for some aluminum structural details like the hand hole. As such, Finite element models for several parametric studies were constructed and analyzed in order to gain insight into the behavior of the light pole structures during wind loads (specifically, wind gust). Parametric studies were conducted to increase understanding of the important geometric features and their influence on local stresses that derive the fatigue response specifically; the hand-hole reinforcement width, hand-hole geometry and shoe base connection were examined. ANSYS Workbench was used to complete all of the analysis (ANSYS, 2012). The fatigue behavior of light pole structures subjected to 3-sec wind gusts will be studied with particular emphasis on two critical locations. In particular, emphasis will be placed on hand-hole and shoe-base connections. The results indicate that, light pole structures with pole thicknesses larger than 0.375 in are not susceptible to fatigue failure around shoe base connection for the loading and sizes considered. In addition, by increasing pole thicknesses, the maximum stress around shoe base decreases. For the case of the hand-hole with different widths, hand-hole with width of 0.5 in shows better performance as compare to 0.1 in and 1 in width. Finally, the results indicate that increasing hand-hole thicknesses will reduce fatigue failures around the hand-hole.
Craig Menzemer, Dr. (Advisor)
Tirumalai S. Srivatsan, Dr. (Committee Member)
Wieslaw Binienda, Dr. (Committee Member)
Civil Engineering

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Citations

  • Hosseini, M. S. (2013). Parametric Study of Fatigue in Light Pole Structures [Master's thesis, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1374530021

    APA Style (7th edition)

  • Hosseini, Maryam Sadat. Parametric Study of Fatigue in Light Pole Structures. 2013. University of Akron, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1374530021.

    MLA Style (8th edition)

  • Hosseini, Maryam Sadat. "Parametric Study of Fatigue in Light Pole Structures." Master's thesis, University of Akron, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=akron1374530021

    Chicago Manual of Style (17th edition)

akron1374530021
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This open access ETD is published by University of Akron and OhioLINK.