The ENV allows for fatigue models 1, 2 and 4 to be modified by the relevant authority. The ENV provides "boxed values" for model 1, and UK values for these are given in annex X.
The ENV does not provide "boxed values" for models 2 and 4, but modifications to these models to improve their suitability are given.
The ENV states that modification to model 3 "depends on the verification procedure". A modification to this model is also presented. The cycle multiplication factor, Kf, is provided to account for the effects of more than one heavy vehicle simultaneously in a lane.
To allow for coincidences of fatigue loading in two or more lanes, see BS 5400-10:1980, 22.214.171.124(g).
EUROPEAN PRESTANDARD PRÉNORME EUROPÉENNE EUROPÄISCHE VORNORM
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