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Stress over upper 0.8 of the depth of the compression zone = 0.8f. = 16 N/mm2

As a first estimate of 0, assume that the neutral axis is perpendicular to the direction of principal bending. This gives

Try 0 = 30° which gives tan0 = 0.58 and cos© = 0.87 The limiting value of xo is where x' = h Hence

0 0

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