Partial factors for wind actions considering hidden safety due to time invariant components
Abstract eng: Wind actions depend on the time variant component q = ρv2/2, where v denotes wind speed, ρ the volume density of air, and on the time invariant component C characterizing structural conditions. Resulting action C q depends on several random variables described by relevant three parameter lognormal distributions. The characteristic wind pressure wk is given by the characteristic value of annual wind speed v1,k and by a specified value Csafe of the component C, suspected of providing “hidden safety”. The design wind pressure wN,d related to N years is defined as the upper fractile of wN corresponding to the probability Φ(−αFβ), where Φ denotes the standardized normal distribution, αF FORM sensitivity factor and β the target reliability index. It is demonstrated that the partial factor γw = wN,d /wk may be expected within a broad range depending on β, N, skewness αv and on the hidden safety Csafe.
Contributors:
Publisher:
Taylor and Francis Group, London, UK
Conference Title:
Conference Title:
Sixth International Conference on Structural Engineering, Mechanics and Computation
Conference Venue:
Cape Town, South Africa
Conference Dates:
2016-09-05 / 2016-09-07
Rights:
Text je chráněný podle autorského zákona č. 121/2000 Sb.
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Record created 2016-09-20, last modified 2016-09-20
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