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- W1586485943 abstract "High mast lighting structures are being used to provide illumination for large intersections, particularly for highways located in rural areas. These structures, ranging from approximately 50 – 130 ft (15 – 40 m) in height, are exposed to high wind forces that in turn produce a tremendous number of loading cycles each year. A recent high mast lighting structural support failure in the high plains of Colorado near Denver International Airport provided the impetus for this study. Specifically, a numerical investigation was conducted to determine the nature of the complex dynamic response, estimate the fatigue life, and determine the effect of extreme wind gusts known as micro-bursts on this dynamic response as well as the effect on the resulting fatigue life. These high-mast structures are less than 3.28 ft (1 m) in diameter and are quite flexible relative to many civil engineering structures. This flexibility results in large deformations when compared to their diameter, i.e. when combined with the height of these structures. Furthermore, large forces and moments at the base are produced that result in large stresses and stress reversals during multi-mode excitation. Morison’s equation, which provides relative force for slender bodies as a function of flow velocity, was applied within a dynamic finite element framework in order to account for the relative motion between the wind and the motion of the structure. Then, a well-known random vibrations approach was coupled with Miner’s rule to estimate the fatigue life of the structural support. Six different design parameters as well as mean wind velocities were examined and an approximate reliability-based design procedure was developed based on these results. Several examples are presented to illustrate the new approach. However, in order for the approach to be appropriately applied to high-mast lighting structural supports in Colorado it is strongly recommended that a state-wide wind study be undertaken to provide accurate reliability indices for all traffic and safety structures such as signal poles, overhead signs, and high-mast lights." @default.
- W1586485943 created "2016-06-24" @default.
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- W1586485943 date "2006-03-01" @default.
- W1586485943 modified "2023-09-27" @default.
- W1586485943 title "Development of a Reliability-Based Design Procedure for High-Mast Lighting Structural Supports in Colorado" @default.
- W1586485943 hasPublicationYear "2006" @default.
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