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Structural Engineering and Mechanics Volume 6, Number 5, July 1998 , pages 555-569 DOI: https://doi.org/10.12989/sem.1998.6.5.555 |
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Reliability of microwave towers against extreme winds |
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Deoliya R, Datta TK
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| Abstract | ||
| The reliability of antenna tower designed for a n-year design wind speed is determined by considering the variability of the strength of the component members and of the mean wind speed. For obtaining the n-year design wind speed, maximum annual wind speed is assumed to follow Gumbel Type-1 distribution. Following this distribution of the wind speed, the mean and standard deviation of stresses in each component member are worked out. The variability of the strength of members is defined by means of the nominal strength and a coefficient of variation. The probability of failure of the critical members of tower is determined by the first order second moment method (FOSM) of reliability analysis. Using the above method, the reliability against allowable stress failure of the critical members as well as the system reliabilities for a 75 m tall antenna tower, designed for n-year design wind speed, are presented. | ||
| Key Words | ||
| microwave towers, reliability, system reliability, extreme wind, first order second moment method (FOSM) | ||
| Address | ||
| Deoliya R, Struct Engn Res Ctr, Gaziabad 201001, Uttar Pradesh, India Struct Engn Res Ctr, Gaziabad 201001, Uttar Pradesh, India Indian Inst Technol, Dept Civil Engn, New Delhi 110016, India | ||