Download or read book Fatigue Performance of Variable Message Sign Luminaire Support Structures Fatigue testing and failure analysis of aluminum luminaire support structures written by Gary R. Consolazio and published by . This book was released on 1998 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fatigue Performance of Variable Message Sign Luminaire Support Structures written by Gary R. Consolazio and published by . This book was released on 1998 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fatigue testing and failure analysis of aluminum luminaire support structures written by Gary R. Consolazio and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fatigue Performance of Variable Message Sign Luminaire Support Structures written by Gary R. Consolazio and published by . This book was released on 1998 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fatigue Testing and Failure Analysis of Aluminum Luminaire Support Structures written by Kevin W. Johns and published by . This book was released on 1998 with total page 67 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fatigue Behavior of Highway Welded Aluminum Light Pole Support Structures written by Diya Azzam and published by . This book was released on 2006 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt: "A number of localized failures have developed in cantilevered supports of highway signs, luminaries and traffic signals over the past ten years. Failures due to fatigue crack growth around welded structural details have occurred in societ connections within New Jersey, Iowa, Florida, Wisconsin, California, Massachusetts and Wyoming. Many of these failures have resulted from the interaction of the wind and the structures, resulting in numerous applied stress cycles. Accordingly, fatigue tests were conducted on full-scale welded aluminum light poles containing through plate and shoe base socket connections. Through plate and shoe base socket connections are used to anchor aluminum light poles to a break away foundation. Initiative for the study was a lack of available data for aluminum structural details, and the result of detrimental changes to specifications governing the design and proportioning of welded aluminum luminaire supports subjected to fatigue loading. As such, fatigue tests were conducted on light poles containing both shoe base and through plate socket connection details order to study the fatigue behavior and determine a lower bound resistance suitable for design in terms of S-N curves. Parametric studies using the finite element method were conducted on both detail types in order to understand the nature of the local stress fields governing fatigue behavior and how changes in geometry affect the local stresses. As stress range is the primary parameter used to describe fatigue strength, hole drilling strain measurements were utilized to examine whether the light pole details contained significant tensile residual stresses normally assumed to exist with welded construction ..."--P. iii-iv.
Download or read book Fatigue Design of Aluminum Components and Structures written by Maurice L. Sharp and published by McGraw Hill Professional. This book was released on 1996 with total page 372 pages. Available in PDF, EPUB and Kindle. Book excerpt: Focusing on the design challenges associated with using aluminum in such fatigue-critical applications as highway infrastructures, transportation vehicles, automotive suspension systems, and aircraft and machine parts, this reference gives the data and guidelines that mechanical and civil design engineers need to meet these challenges head on.
Download or read book Fatigue Failure of Aluminum Luminaire Supports written by Ralph A. McCagg and published by . This book was released on 1977 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dynamic testing of luminaire supports written by and published by . This book was released on 1973 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book In Service Fatigue Reliability of Structures written by Sergei V. Petinov and published by Springer. This book was released on 2018-12-20 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides readers with the latest know-how and tools needed to assess the in-service strength and reliability of welded structures. It addresses the two principal mechanisms of structural material deterioration, fatigue and corrosion, which affect the in-service behavior of structures. In this regard, the primary focus is on fatigue in connection with various structural failure scenarios. Realistic and typical examples of welded structures’ design and residual life assessment are used throughout the book in order to show readers the complexity of real-world assessments. The book offers a valuable resource for master’s students in mechanical and civil engineering, and for engineers whose work involves fatigue design and in-service inspections of welded structures.
Download or read book Fatigue Behavior of the Reinforced Electrical Access Hole in Aluminum Light Support Structures written by Clark Schlatter and published by . This book was released on 2017 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt: Aluminum light poles are constructed from extruded aluminum tube in order to minimize the use of material. This in turn makes the pole lighter and allows for the electrical wires for the light to be hidden inside the pole. These wires must still be accessed for installation and maintenance purposes. An electrical access hole with a cover is placed near the bottom of the pole to make the wires accessible.This electrical access hole is a point of structural weakness in the pole; therefore, the electrical access hole is often reinforced. This reinforcing may solve potential static load problems, but the disruption in the load path is a potential fatigue crack initiation point. This research centered on how fatigue failure occurs in cast reinforced electrical access holes.The majority of the experimental research consisted of the cyclical bending of tubes with the electrical access holes centered in the extreme tension fiber. Ten poles with electrical access holes were broken in fatigue. The stress range applied to these varied from 63 MPa (9.1 ksi) at the highest to 17 MPa (2.5 ksi) at the lowest. Three tensile tests and a high shear fatigue test were conducted to supplement would could not be observed from the cyclical bending tests.Finite element models were developed to understand the mechanical response of the electrical access hole. These were similar to the bending and tensile samples. A finite element model in a cantilevered position was modeled as well. These models allowed for stress maps to be examined and a potential explanation for initial cracking to be developed. The initial cracking of the electrical access hole occurs in the weld near the minor axis of the elliptical hole. This initial cracking was due to distortion of the reinforcing of the electrical access hole. These cracks either propagate through the reinforcing or join together to cause final failure. The stress range versus the cycles to failure for the electrical access hole was plotted to compare the data to known aluminum fatigue details. The data all fell between categories C and D for aluminum. Further research is needed to verify if a D detail can be used for designing the electrical access hole in fatigue.
Download or read book A Study of the Acoustic Fatigue Characteristics of Some Flat and Curved Aluminum Panels Exposed to Random and Discrete Noise written by Robert W. Hess and published by . This book was released on 1959 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Variable amplitude Fatigue Tests with Particular Attention to the Effects of High and Low Loads written by Eugene C. Naumann and published by . This book was released on 1962 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Test and Evaluation of Arizona Slip away Base Luminaire Supports written by Roger P. Bligh and published by . This book was released on 1994 with total page 106 pages. Available in PDF, EPUB and Kindle. Book excerpt: A study was undertaken to evaluate the impact performance of the Arizona Department of Transportation's (ADOT's) slip-away base luminaire supports. For purposes of this evaluation, three full-scale crash tests were conducted in accordance with the requirements of NCHRP Report 350. During this test program, ADOT's 13.7-m (45-ft) constant tapered luminaire support was found to exhibit unacceptable impact performance. Although the slip base activated readily and the occupant impact velocity was within recommended limits, a secondary impact of the pole with the roof of the vehicle resulted in substantial deformation of the roof structure. A subsequent test of ADOT's standard 12.2-m (40-ft) luminaire system was judged to be marginally acceptable. Although the luminaire support readily yielded to the vehicle and the occupant risk criteria were well within the recommended limits established by NCHRP Report 350, the test vehicle once again sustained substantial deformation to the roof structure from a secondary impact with the luminaire pole. However, the magnitude and localized extent of the crush was judged to be within acceptable limits based on results of other approved systems. Several candidate systems were identified which provide a mounting height of 13.7 m (45 ft) or greater and which could serve as replacements for ADOT's deficient 13.7-m (45-ft) poles. The most promising of these is a steel 4-bolt slip-base design developed by the Utah Department of Transportation (UDOT) which has a mounting height of 15.8 m (52 ft) and was successfully crash tested. As an alternative to adopting a new design, it is also recommended that the current design requirements be carefully reviewed and options for reducing the weight of the existing system be considered. Maintenance practices related to slip-bolt torque were also reviewed. Although no specific post-installation inspection procedure for slip-base bolt torques is offered at this time, periodic visual inspections of slip-base poles should be considered to determine if debris, soil, corrosion, erosion, or other hindrances that could compromise proper actuation of the slip-base are present. It was also noted that although proper performance of slip-base supports depends on the clamping force in the slip-base bolts, crash tests and analytical studies indicate that the performance is not overly sensitive to the clamping force.
Download or read book A Parameter Study of the Dynamic Response of Luminaire Support Structures written by J. E. Martinez and published by . This book was released on 1968 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Summary of Luminaire Support Capability Testing Final Report written by Allen G. Hansen and published by . This book was released on 1988 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book References on Fatigue written by ASTM Committee E-9 on Fatigue and published by . This book was released on 1961 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt:
