DNV-OS-C502 Offshore Concrete Structures

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DNV-OS-C502 Offshore Concrete Structures

App.F: Crackwidth Calculation (Guidelines)

A: General

A500: Simplified Approach

App.F
A 500 Simplified Approach

The crackwidth may be calculated by the following simplified equation:

raster

Where:
s_s2 = the stress in the reinforcement in the crack for the actual cross-sectional forces
s_sr2 = the reinforcement stress at the crack location for those cross-sectional forces which give maximum tensile stress in the reinforcement at cracking of the concrete (max tensile stress in concrete equal to tensile strength). The calculation of reinforcement stress is based on cracked concrete.
s_rk = See A200 above.

s_sr2 is calculated based on the same ratio between the cross-sectional forces (the same location of the neutral axis) as used in the calculation of, s_s2 , and shall not be larger than s_s2.

For structures exposed to water pressure, the reinforcement stress, s_s2, shall include the effect of full water pressure, p_w, on the crack surface.

Additional simplification may be made by presuming b_s = 0, thus neglecting the shrinkage strain.

s_s2	=	the stress in the reinforcement in the crack for the actual cross-sectional forces
s_sr2	=	the reinforcement stress at the crack location for those cross-sectional forces which give maximum tensile stress in the reinforcement at cracking of the concrete (max tensile stress in concrete equal to tensile strength). The calculation of reinforcement stress is based on cracked concrete.
s_rk	=	See A200 above.

DNV-OS-C502 Offshore Concrete Structures

App.FA 500 Simplified Approach

App.F
A 500 Simplified Approach