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Structural Engineering and Mechanics
  Volume 6, Number 7, October 1998, pages 773-784
DOI: http://dx.doi.org/10.12989/sem.1998.6.7.773
 

Risk assessment of transmission line structures under severe thunderstorms
Li CQ

 
Abstract     [Full Text]
    To assess the collapse risk of transmission line structures subject to natural hazards, it is important to identify what hazard may cause the structural collapse. In Australia and many other countries, a large proportion of failures of transmission line structures are caused by severe thunderstorms. Because the wind loads generated by thunderstorms are not only random but time-variant as well, a time-dependent structural reliability approach for the risk assessment of transmission line structures is essential. However, a lack of appropriate stochastic models for thunderstorm winds usually makes this kind of anaysis impossible. The intention of the paper is to propose a stochastic model that could realistically and accurately simulate wind loading due to severe thunderstorms. With the proposed thunderstorm model, the collapse risk of transmission line structures under severe thunderstorms is assessed numerically based on the computed failure probability of the structure.
 
Key Words
    risk, failure probability, transmission line, thunderstorms, wind loads, stochastic model, poisson process, upcrossing rate
 
Address
Li CQ, Monash Univ, Dept Civil Engn, Clayton, Vic 3145, Australia
Monash Univ, Dept Civil Engn, Clayton, Vic 3145, Australia
 

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