Fatigue life assessment of traffic-signal support structures from an analytical approach and long-term vibration monitoring data

Jie Ding, Xinzhong Chen, Delong Zuo, Jieying Hua

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

Wind-induced, large-amplitude vibrations of traffic-signal support structures are frequently observed. Such vibrations can result in a large number of stress cycles and substantial fatigue damage. This paper presents the characteristics of wind-induced vibration of a traffic-signal support structure observed in a long-term, full-scale measurement project, which are used as a basis to understand the vibration generation mechanism. Based on the measured structural response, conditional on mean wind speed, wind direction, and turbulence intensity, the fatigue damage is evaluated using a closed-form spectral method with consideration of narrowband, non-Gaussian response characteristics. The uncertainty in the structural response under given wind conditions is quantified and included in the fatigue damage evaluation. The effectiveness and accuracy of the proposed approach are illustrated by comparing the results of the spectral method with that from the timedomain rainflow counting method based on the long-term stress time histories. The core parameters that influence the fatigue damage analysis and fatigue life prediction of traffic-signal support structures are also examined through a parametric study.

Original languageEnglish
Article number04016017
JournalJournal of Structural Engineering (United States)
Volume142
Issue number6
DOIs
StatePublished - Jun 1 2016

Keywords

  • Crosswind response
  • Fatigue damage
  • Fatigue life
  • Field monitoring
  • Non-Gaussian response
  • Traffic-signal support structures
  • Vortex-induced vibration
  • Wind effects

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