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The National Academies

NCHRP 12-111 [Active]

Evaluating the Effectiveness of Vibration-Mitigation Devices for Structural Supports of Signs, Luminaires, and Traffic Signals

  Project Data
Funds: $400,000
Staff Responsibility: C. Crichton-Sumners
Research Agency: University of Connecticut
Principal Investigator: Richard Christenson
Effective Date: 4/3/2017
Completion Date: 12/31/2021
Comments: Research underway.

BACKGROUND: Structural supports for signs, luminaires, and traffic signals are typically characterized by high flexibility and low damping, which makes them prone to wind-induced vibration and susceptible to fatigue and structural failure. Use of vibration-mitigation devices could reduce the induced vibration thereby increasing the life of new and existing structures; reducing costs of new structures; contributing to improved safety to the traveling public; and reduced maintenance, inspection, and repair costs. Although several mitigation devices have been proposed, only a few have been used, primarily due to the absence of test methods for evaluating their effectiveness and implications in the structural design process. Research is needed to develop test procedures for evaluating the effectiveness of these vibration-mitigation devices and considering their effect in the structural design process. Incorporating such procedures into the AASHTO LRFD Specifications for Structural Supports for Signs, Luminaires, and Traffic Signals (AASHTO LRFD SLTS Specifications) would facilitate the use of effective vibration-mitigation devices for new and existing structures and help accrue economic and other benefits.
 
OBJECTIVES: The objectives of this research are to (1) develop test procedures for evaluating the effectiveness of vibration-mitigation devices for structural supports of signs, luminaires, and traffic signals and (2) propose procedures for considering the effectiveness of these devices in the design process of the structural supports. These procedures shall be appropriate for potential incorporation into the AASHTO LRFD SLTS Specifications.
 
Accomplishment of these objectives will require at least the following tasks.
 
TASKS
 
Phase I: (1). Collect and review relevant domestic and foreign literature; research findings; and information relative to vibration-mitigation devices applicable to structural supports of signs, luminaires, and traffic signals. This information may be obtained from published and unpublished reports; a survey of state DOTs; and contacts with transportation agencies, industry, and other public and private organizations. (2). Based on the review performed in Task 1, identify criteria and potential test procedures for evaluating the effectiveness of vibration-mitigation devices for various structural supports of signs, luminaires, and traffic signals. (3). Based on the work performed in Tasks 1 and 2, propose specific criteria and test procedures for evaluating the effectiveness of vibration-mitigation devices for further development in Phase II. New procedures and procedures based on available technologies should be considered. (4). Prepare an updated, detailed work plan for Phase II that includes a process for (1) developing test procedures for evaluating the effectiveness of vibration-mitigation devices for structural supports of signs, luminaires, and traffic signals; (2) proposing procedures for considering the effectiveness of these devices in the design process of the structural supports; and (3) proposing modifications to relevant sections of the AASHTO LRFD SLTS Specifications. The plan should consider validating the feasibility of the proposed test procedures by testing and/or use of available data. (5). Prepare an interim report that documents the research performed in Tasks 1 through 4. Following review of the interim report by the NCHRP, the research team will be required to make a presentation to the project panel. Work on Phase II of the project will not begin until the interim report is approved and the Phase II work plan is authorized by the NCHRP. The decision on proceeding with Phase II will be based on the contractor’s documented justification of the updated work plan.
 
Phase II: (6). Execute the plan approved in Task 5. Based on the results of this work, (1) develop test procedures for evaluating the effectiveness of vibration-mitigation devices for structural supports of signs, luminaires, and traffic signals; (2) propose procedures for considering the effectiveness of these devices in the structural design process; and (3) propose modifications to relevant sections of the AASHTO LRFD SLTS Specification. Also, provide a stand-alone technical memorandum titled “Implementation of Research Findings and Products”. (7). Submit a final deliverable that documents the entire research effort. The test and design procedures and proposed specification modifications shall be prepared as stand-alone documents appropriate for incorporation into the AASHTO LRFD SLTS Specifications.
 
STATUS: Project started on April 3, 2017.

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