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Behavior of Welded Aluminum Light-pole Details near Fatigue Limit

Daneshkhah, Ali Reza
http://rave.ohiolink.edu/etdc/view?acc_num=akron1552647484151581

Abstract Details

2019, Doctor of Philosophy, University of Akron, Civil Engineering.
Welded aluminum light-poles are frequently used along highways and in industrial service applications including parking lots, harbors, stadiums, etc… Cantilevered light-poles are lightly damped, slender structural systems subjected to cyclic loading based on the response to wind. As a result, fatigue life analysis and design of such systems are necessary. A number of welded aluminum light-pole specimens have been fatigue tested, and for convenience, are broken down into three groups for ease of discussion. Groups 1 and 2 included 41 and 35 specimens, respectively, and consisted of extruded aluminum poles welded to either through-plate or shoe-base connection details. Not all group 1 data points were generated during the course of this study, but are included to provide a basis for comparison. Group 3 consisted of ten “combination specimens” which contained both shoe-base and hand-hole details. Fatigue data was utilized to develop best-fit and design S-N curves for the shoe-base detail. More importantly, however, runout data generated during the course of this as well as previous studies was used to develop a Constant Amplitude Fatigue Limit (CAFL). Several different statistical methods were used to generate estimates of the CAFL. Given the random nature of wind loading, the fatigue limit is the basis for design. In order to better understand the fatigue behavior of the welded shoe-base details, a parametric study using the finite element method was conducted. Different parameters included in the study were a) bolt circle diameter, b) socket depth, c) fillet weld leg-size and d) tube thickness. A fracture mechanics model for fatigue life prediction was developed and calibrated based on test results. Fatigue life prediction considering the different geometrical parameters was conducted and S-N curves developed. Trends in behavior were identified and design recommendations provided.
Craig Menzemer, PhD (Advisor)
David Roke, PhD (Committee Member)
Gary Doll, PhD (Committee Member)
J. Alexis, PhD (Committee Member)
J. Patrick Wilber, PhD (Committee Member)
231 p.
Civil Engineering

Recommended Citations

Citations

  • Daneshkhah, A. R. (2019). Behavior of Welded Aluminum Light-pole Details near Fatigue Limit [Doctoral dissertation, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1552647484151581

    APA Style (7th edition)

  • Daneshkhah, Ali Reza. Behavior of Welded Aluminum Light-pole Details near Fatigue Limit. 2019. University of Akron, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1552647484151581.

    MLA Style (8th edition)

  • Daneshkhah, Ali Reza. "Behavior of Welded Aluminum Light-pole Details near Fatigue Limit." Doctoral dissertation, University of Akron, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=akron1552647484151581

    Chicago Manual of Style (17th edition)

akron1552647484151581
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© 2019, all rights reserved.
This open access ETD is published by University of Akron and OhioLINK.