Development of a Procedure for Fatigue Design of Slender Support Structures Subjected to Wind-Induced Vibration

Author:

Chang Byungik1,Phares Brent M.2,Sarkar Partha P.3,Wipf Terry J.2

Affiliation:

1. Department of Engineering and Computer Science, West Texas A&M University, WTAMU Box 60767, Canyon, TX 79016.

2. Bridge Engineering Center, Iowa State University, 2711 South Loop Drive, Suite 4700, Ames, IA 50010.

3. Department of Aerospace Engineering, Iowa State University, 2271 Howe Hall, Room 1200, Ames, IA 50011.

Abstract

Cantilevered signal, sign, and light support structures are used nationwide on major Interstate highways, national highways, local highways, and at local intersections for traffic control. Recently, a number of failures of these structures have been characterized as wind-induced fatigue failures. It is widely accepted that there is considerable lack of accuracy in the calculation of wind-induced loads on high mast light poles (HMLPs) in both the AASHTO and the Canadian Highway Bridge Design Code provisions. A coupled model for predicting buffeting- and vortex shedding–induced response for slender support structures was developed. To accomplish this, monitoring of long-term response behavior of an HMLP subjected to wind-induced vibration and wind tunnel experiments was used to study global behavior and to extract important parameters. From the long-term field monitoring and wind tunnel experiments, the two critical types of wind vibration (natural wind gusts or buffeting and vortex shedding) were individually identified for in-depth analysis. Finally, a coupled dynamic model in time domain was developed for predicting the wind-excited response and was validated by comparing the simulation results with the field-collected data. The fatigue life of a specific HMLP was also estimated with the stress amplitudes predicted by the time-domain model and was validated with statistical extrapolation of the field data.

Publisher

SAGE Publications

Subject

Mechanical Engineering,Civil and Structural Engineering

Reference14 articles.

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