In order to investigate the complete problem of antenna design under wind load in a statistical way, a time variant reliability procedure is proposed in this paper, which differs from conventional reliability approaches for antenna design. It considers the influence of the Gaussian behavior of wind-induced pressures of antenna in its lifetime on the reliability index of antenna. It is shown that the reliability of under wind load significantly reduces when time is considered. A time independent reliability approach which does not consider degradation of may greatly over estimate the reliability index for antenna under fluctuating wind load.The design recommendations are also given in this paper. The procedures proposed in this paper represent a suitable way to evaluate the safety of antenna under wind load.
Assessing efficiently the lifetime of aging mechanical components structures needs taking into account the random and temporal character of material properties, environmental conditions and loads. Time-variant reliability methods are a way to deal with this source of concern. Combined with the theory of reliability design and the method durability, computation method of time-dependent reliability of mechanical components is set based on models of time-dependent reliability. A realistic prediction of the durability of industrial-type structures also requires considering non-linear material behavior induced by plasticity, damage, etc. Therefore this paper has presented the PHI2 method for solving time-variant reliability problems and is illustrated on the example of a side beam submitted to a random load.
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