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Field Testing Of Cantilevered Traffic Signal Structures Under Truck Induced Gust Loads
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Book Synopsis Field Testing of Cantilevered Traffic Signal Structures Under Truck-induced Gust Loads by :
Download or read book Field Testing of Cantilevered Traffic Signal Structures Under Truck-induced Gust Loads written by and published by . This book was released on 2007 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Field Tests and Analytical Studies of the Dynamic Behavior and the Onset of Galloping in Traffic Signal Structures by :
Download or read book Field Tests and Analytical Studies of the Dynamic Behavior and the Onset of Galloping in Traffic Signal Structures written by and published by . This book was released on 2007 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fatigue-resistant Design of Cantilevered Signal, Sign and Light Supports by : Mark R. Kaczinski
Download or read book Fatigue-resistant Design of Cantilevered Signal, Sign and Light Supports written by Mark R. Kaczinski and published by Transportation Research Board. This book was released on 1998 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fatigue-resistant Design of Cantilevered Signal, Sign, and Light Supports by : Robert Joseph Dexter
Download or read book Fatigue-resistant Design of Cantilevered Signal, Sign, and Light Supports written by Robert Joseph Dexter and published by Transportation Research Board. This book was released on 2002 with total page 111 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :American Association of State Highway and Transportation Officials Publisher :AASHTO ISBN 13 :156051034X Total Pages :91 pages Book Rating :4.5/5 (65 download)
Book Synopsis Guide Design Specification for Bridge Temporary Works by : American Association of State Highway and Transportation Officials
Download or read book Guide Design Specification for Bridge Temporary Works written by American Association of State Highway and Transportation Officials and published by AASHTO. This book was released on 1995 with total page 91 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fatigue Testing of Stiffened Traffic Signal Structures by : John P. Peiffer
Download or read book Fatigue Testing of Stiffened Traffic Signal Structures written by John P. Peiffer and published by ProQuest. This book was released on 2009 with total page 149 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sixteen fatigue tests were performed on twelve cantilevered traffic signal poles to quantify the fatigue resistance of a ring-stiffened built-up box connection. Two poles sizes were tested in three configurations: in-plane, out-of-plane, and diagonal. Cyclic loading was applied to produce stress ranges of up to 16 ksi in the main member, more than six times the stress range observed during field testing. Performance test results for this connection typically plot above an AASHTO detail design stress category D. Connection bolt fatigue failures were observed and may be the limiting fatigue design feature.
Book Synopsis Fatigue Loading and Design Methodology for High-Mast Lighting Towers by : Robert J. Connor
Download or read book Fatigue Loading and Design Methodology for High-Mast Lighting Towers written by Robert J. Connor and published by Transportation Research Board. This book was released on 2012 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt: TRB’s National Cooperative Highway Research Program (NCHRP) Report 718: Fatigue Loading and Design Methodology for High-Mast Lighting Towers provides criteria for the fatigue design of high-mast lighting towers.
Book Synopsis Wind-induced Vibrations of Cantilevered Traffic Signal Structures by : Narendra Pulipaka
Download or read book Wind-induced Vibrations of Cantilevered Traffic Signal Structures written by Narendra Pulipaka and published by . This book was released on 1995 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Report written by and published by . This book was released on 1964 with total page 590 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Field Tests and Analytical Studies of the Dynamic Behavior and the Onset of Galloping in Traffic Signal Structures by : Micah Jonathan Florea
Download or read book Field Tests and Analytical Studies of the Dynamic Behavior and the Onset of Galloping in Traffic Signal Structures written by Micah Jonathan Florea and published by . This book was released on 2005 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Unpredictable fatigue failures of cantilevered mono-tube traffic signal structures in Texas and throughout the United States in recent years have created the need to study their fatigue behavior. Based on recent research, the AASHTO specification has adopted a design equation for galloping loads that is overly conservative in many cases. The Texas Department of Transportation is interested in establishing design criteria for galloping that more accurately represents galloping potential and provides a more efficient design. In this study, three signal structures in Texas were monitored for a total of 9 months to detect the magnitude of galloping forces experienced in the field. Although large amplitude displacements were measured in the field, sustained galloping did not occur. In addition to the field tests, an analytical model was developed and used to perform a parametric study for predicting the galloping potential of traffic signal structures with various properties. The analytical model suggests that modifying the aerodynamic properties of the sign and signal attachments may be the most effective way to eliminate galloping
Book Synopsis Evaluation of Damping in Cantilevered Traffic Signal Structures Under Forced Vibrations by : Patrick S. McManus
Download or read book Evaluation of Damping in Cantilevered Traffic Signal Structures Under Forced Vibrations written by Patrick S. McManus and published by . This book was released on 2000 with total page 254 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Mitigating Wind-Induced Fatigue in Steel Traffic Signal Support Structures by : Kyle Thomas Wieghaus
Download or read book Mitigating Wind-Induced Fatigue in Steel Traffic Signal Support Structures written by Kyle Thomas Wieghaus and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Traffic signal structures undergo wind-induced vibrations that result in fatigue damage accumulation and reduced service life. Mast arms have failed and required removal while in service. A dual experimental and analytical modeling approach is taken to mitigate fatigue and fracture in steel traffic supporting structures. A full-scale prototype structure is instrumented to study natural wind response. Excitation mechanisms are identified, and response is characterized statistically by a lognormal distribution. Helical strakes are found to reduce the vortex-induced vibration of cantilevered traffic signal structures, however are not a panacea for fatigue mitigation as marginal service life gains occur in severe wind environments. A probabilistic framework is extended to assess the risk of wind-induced fatigue and estimate service life while considering uncertainties in fatigue demand and capacity. The framework is successfully demonstrated against compiled inspection records. Locations with higher prevailing winds are susceptible to wind-induced fatigue, but the prevalence of low-speed vortex-induced response is primarily responsible for the early fatigue failures in more mild environments. A low-cost damage avoidance system is proposed to mitigate fatigue and fracture in steel traffic supporting structures. Applied prestress introduces a fail-safe, supplementary load path to balance dead load moment, eradicating the detrimental tensile mean stress found in traffic signal structure connections. Field observations are made without and with the proposed system installed. The benefit of applied prestress is quantified by determining service life without and with the system based on changes in response and fatigue resistance using: (i) a code-based technique; and (ii) the proposed probabilistic framework. Fatigue performance is modeled as mean stress-dependent by modifying nominal stress-life relationships. Service life is shown to increase by an order of magnitude, regardless of wind environment. The concept shows potential to reduce the detrimental effects of non-redundancy for a variety of similar, fatigue-critical infrastructure components. The validity of simplified mean stress-dependent connection modeling is explored. A fracture mechanics-based, total life (initiation-propagation) model is used to demonstrate the detrimental effect mean stress has on tube-to-transverse base plate fatigue resistance. Using fatigue strength curves derived from total life analyses, probabilistic analyses are repeated to justify the use of simplified models. The electronic version of this dissertation is accessible from http://hdl.handle.net/1969.1/155395
Book Synopsis Dynamic Response of Cantilevered Traffic Signal Structures Under In-service Conditons [i.e. Conditions] by : Charles E. Brisko
Download or read book Dynamic Response of Cantilevered Traffic Signal Structures Under In-service Conditons [i.e. Conditions] written by Charles E. Brisko and published by . This book was released on 2002 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Increased Damping in Cantilevered Traffic Signal Structures by : G. Scott Riggs
Download or read book Increased Damping in Cantilevered Traffic Signal Structures written by G. Scott Riggs and published by . This book was released on 1998 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Structural Supports for Highway Signs, Luminaires, and Traffic Signals by : Fouad H. Fouad
Download or read book Structural Supports for Highway Signs, Luminaires, and Traffic Signals written by Fouad H. Fouad and published by Transportation Research Board. This book was released on 2003 with total page 59 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Full-scale Investigation of Wind-induced Vibrations of Mast-arm Traffic Signal Structures by : Hung Nguyen Sinh
Download or read book Full-scale Investigation of Wind-induced Vibrations of Mast-arm Traffic Signal Structures written by Hung Nguyen Sinh and published by . This book was released on 2014 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt: Because of their inherent flexibility and low damping ratios, cantilevered mast-arm traffic signal structures are susceptible to wind-induced vibrations. These vibrations cause structural stresses and strains to develop in a cyclical fashion which can lead to reduced service life due to fatigue and, in extreme cases, full collapse. In 2001, after the collapse of several of these structures throughout the United States, American Association of State Highway and Transportation Officials (AASHTO) code standards were updated to include fatigue provisions for traffic signal supporting structures. In New York State, there is particular concern regarding structures spanning longer than 14 meters which currently do not meet these updated fatigue provisions. To address this concern, a full-scale experiment was conducted using an existing 25 meter mast-arm traffic signal structure, located in Malta, NY, in which the response of the structure was observed in relation to in-situ wind conditions. In previous studies, high-amplitude vertical vibrations of mast-arm traffic signal structures have been shown to be due to vortex shedding, a phenomenon in which alternatingly shed, low-pressure vortices induce oscillating forces onto the mast-arm causing a cross-wind response. When the frequency of vortices being shed from the mast-arm corresponds to the natural frequency of the structure, a resonant condition is created. The resonant condition causes the long-lasting, high amplitude vibrations, which may lead to the fatigue failure of these structures. Turbulence in the approach flow is known to affect the cohesiveness of vortex shedding. Results from this full-scale experiment indicate that the surrounding terrain conditions, which affect the turbulence intensity of the wind, greatly influence the likelihood of occurrence of long-lasting, high-amplitude vibrations and also impact whether reduced service life due to fatigue is likely to be a concern.
Book Synopsis Full-scale Controlled Tests of Wind Loads on Traffic Signal Structures by : C. W. Letchford
Download or read book Full-scale Controlled Tests of Wind Loads on Traffic Signal Structures written by C. W. Letchford and published by . This book was released on 2008 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt: