engleski

Determination of wind load on antenna tower

Real-scale field test was performed in region of Dalmatia on wind loaded line-like structure. Influence of wind load on structure was analyzed for two typical winds for this region, Bora and Scirocco. Goal of this paper is to estimate fatigue load spectra. Input variable data (wind speed and direction) was acquired from standard rotating-cup anemometers with vane. Stress in member elements was measured on four level of tower and presented data are from second sensor level. Sensors used for measuring are 1 kΩ , halve and full bridge connected, T-rosette type strain gauges. All measuring devices were connected to one common recording unit. From recording data is perceived that tower response on wind load is predominantly in first vibration mode with respective frequency of 0.97 Hz. Used counting method in analysis is Restricted-Level-Crossing-Counting according to ASTM. The results presented here can also be used in extrapolation for other load intensities and for fatigue life evaluation of existing structures.

wind load ; fatigue ; load spectra

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