Elongation and curvature of a section is immediately available when the strain distribution has been calculated (linear or non-linear) as the components of the strain distribution represent the strain ε0 in reference point R and the curvatures ψy and ψz

These values may be used directly in structural calculations for an uncracked section. For a cracked section, it is unfavourable to use the cracked values directly, as influence of uncracked concrete between cracks is not regarded. This influence is taken care of by the distribution coefficient ζ (see Nonlinear Analysis of Reinforced Concrete Frames Subjected to Thermal and Mechanical Loads, chapter 7.4.3), which approximately regards the distribution between cracked and uncracked part of the element. We get:


The coefficient ζ is generally calculated in connection to cracking.

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