Lecture_10 - 2.4.2 Condition for yielding of compression...

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77 2.4.2 Condition for yielding of compression steel In the analysis, it has been assumed that the compression steel has yielded, so that the steel stress 0.95 s y f f ′ = . From the proportions of the strain diagram shown below, 0.0035 s x d x ε = or 0.0035 s x d x ε = (2.2) From Eq. (2.2), 1 0.0035 s d x ε = (2.42) At yielding with f y = 460 N/mm 2 , the strain of compression steel ε ' s = ε y = 0.00219. From Eq. (2.42), 0.00219 1 1 0.37 0.0035 0.0035 s d x ε = = = Condition for yielding of compression steel (high-yield steel) is 37 . 0 x d (2.43) ε s ε s
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