Dutch design method - ICPA

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Dutch design method - CRCPIn practice a CRCP remains in uncompleted crackpattern (phase II).After cracking the mean crack width wom in phase II is:wom = 2 [(0.4 Ø / (f’cm Es)) σs,cr (σs,cr –n σcr)]where:f’cmØ0.85= mean cube compressive strength after 28 days forloadings of short duration= diameter of reinforcement steel barsσs,cr = tensile stress in steel bars in crack just after crackingσcr= tensile stress in concrete slab just before crackingn = Es / Ec26 October 2009 90
Dutch design method - CRCPThe maximum crack width wo,max in phase II is:wo,max = γso γ∞ wom ≤ wallwhere:γso = factor to include the variation of the crack width;in phase II: γso = 1.3γ∞ = factor to take care of loadings of long duration or cyclicloadings:for σs ≤ 295 N/mm²: γ∞ = 1.33 -9for σs > 295 N/mm²: γ∞ = 1 / (1 – 9 σs 10 )wall = maximum allowable crack width26 October 2009 91
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Dutch design method - ICPA

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