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Design assumptions for reinforcement steel: the strain limit εud

Eurocode 2 part 1-1: Design of concrete structures   3.2.7 (2)

For normal design, either of the following assumptions may be made (see Figure 3.8):

a) an inclined top branch with a strain limit of εud and a maximum stress of kfyk/γS at εuk, where k = (ft/fy)k,

b) a horizontal top branch without the need to check the strain limit.

Recommendation

The recommended value for the strain limit εud is 0,9εuk.

National choice

εud
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