Figure 3.15. Values r| and A for the definition of the rectangular stress block
Approximate equations for A and r are: X = 0,8
per fck <50 N/mm2 per 50 < fck < 70 N/mm2 per fck <50 N/mm2 per 50 < fck < 70 N/mm2
If the width of the compression zone decreases in the direction of the extreme compression fibre, the values given in Eq. 16a,b do not hold. This is investigated in Fig. 3.16.
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