Fatigue behavior of reinforced welded hand-holes in aluminum light poles

Daneshkhah, Ali Reza; Schlatter, Clark Robert; Rusnak, Cameron R.; Menzemer, Craig C.

doi:10.1016/j.engstruct.2019.03.013

Cited by 10 publications

(10 citation statements)

References 5 publications

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“…Static tests were conducted in addition to the fatigue tests in an attempt to gain a better insight into how the strain is distributed around the handhole. The results from this study concluded that the hand-hole fatigue test data fell above category D and E design S-N curves [9]. In addition, the University of Akron performed a study on the effect of a change in the diameter of the specimens, from 10 in to 8 in.…”

Section: Introductionmentioning

confidence: 88%

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Fatigue Behavior of Reinforced Welded Hand-Holes in Aluminum Light Poles with a Change in Detail Geometry

Rusnak¹,

Menzemer²

2023

Failure Analysis - Structural Health Monitoring of Structure and Infrastructure Components

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Welded aluminum light poles often contain hand-holes. These hand-holes are used to give access for electrical wiring installation and maintenance purposes. Wind load may cause light poles to be loaded in a cyclic manner. This cyclic loading can cause localized fatigue cracking around the hand-hole. Fatigue failure around hand-holes has been observed in the field, but studies surrounding the resistance of the hand-holes are few and far between. This study included four-point bending fatigue tests on welded aluminum poles containing hand-holes. Eight welded aluminum specimens, each with two hand-holes, were tested in fatigue. These 16 details were loaded at the same stress range. Each specimen had a slightly different geometry or treatment applied to the hand hole. These different details mimicked traditional reinforced hand holes, similar to those evaluated in previous studies. Changes in the treatment and/or geometry included milling the inside of hole, milling the inside of the hole as well as the cast insert prior to welding, and milling the cast insert itself prior to welding. Among the 16 details tested, 15 failed as a result of fatigue cracking. It was found that specimen failure would originated in the throat of the fillet weld and then proceeded to propagate into the reinforcement ring/casting. A finite element analysis was used in addition to the experimental study.

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Section: Introductionmentioning

confidence: 88%

“…In addition, the University of Akron performed a study on the effect of a change in the diameter of the specimens, from 10 in to 8 in. It was found that this change had a small, but slightly beneficial effect on fatigue life [9].…”

Section: Introductionmentioning

confidence: 98%

Fatigue Behavior of Reinforced Welded Hand-Holes in Aluminum Light Poles with a Change in Detail Geometry

Rusnak¹,

Menzemer²

2023

Failure Analysis - Structural Health Monitoring of Structure and Infrastructure Components

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“…However, the main factor that affects the fatigue is the variation in localized stress or strain. Accordingly, S-N curves that represent the classification or ranking of the stress concentration should be derived [13,14].…”

Section: S-n Curves Backgroundmentioning

confidence: 99%

“…In ad tion, fatigue performance is affected by many parameters which are related to str (load), geometry and properties of the component, as well as the external environme However, the main factor that affects the fatigue is the variation in localized stress strain. Accordingly, S-N curves that represent the classification or ranking of the str concentration should be derived [13,14].…”

Section: S-n Curvesmentioning

confidence: 99%

Finite Element Analysis of Heavy Duty Riveted Steel Grating Bridge Deck

Abdulla

Menzemer

2021

CivilEng

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Heavy duty riveted gratings are a good alternative for applications that often employ other deck systems, if they are carefully analyzed under static and fatigue loads. Understanding the static behavior of a riveted steel deck under tire patch loads will aid in establishing a design model based on an effective beam width. In addition, use of a riveted system avoids welded details that may lead to fatigue cracking, thereby improving design life. In this study, analysis of a typical riveted steel deck under a standard AASHTO fatigue truck with a 15% impact factor was conducted. Hand calculations were compared with the results of a finite element model using SAP2000 v19.2.1. Bending moments and stresses were evaluated and compared. Stresses at the rivet hole for the most highly loaded bearing bar were evaluated. A model for fatigue cracking around a rivet hole is discussed.

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“…In addition to fatigue tests, several static tests were conducted in order to gain insight into the strain distribution around the hand-hole. This study found that typical reinforced welded hand-hole fatigue test data fell above both the category D and E design S-N curves of the Aluminum Design Manual (ADM) [9]. Another study found that the change in diameter of the pole has some effect on the fatigue life [10].…”

Section: Introductionmentioning

confidence: 99%