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Consider the section shown in Figure-1 subjected to pure bending moment about a horizontal axis.
(a) Show that at "ultimate" dn = 119.4 mm. To answer this question, use trial-and-error method, assume a dn value and determine the corresponding strains, stresses, and forces accordingly. Then check whether C=T, if it does not, assume another dn until satisfying C=T. Ignore dn = 119.4 mm, calculate the neutral axis depth at the ultimate stage and proceed to the next part accordingly.
(b) Calculate Muo
(c) Determine ku
f c=32 MPa, As= 8N24

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425 325 175 75 150 50% 200/150 10/150 150 200 150. 150
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