772.4.2 Condition for yielding of compression steel •In the analysis, it has been assumed that the compression steel has yielded, so that the steel stress 0.95syff′ =. From the proportions of the strain diagram shown below, 0.0035sxdxε′=′−or 0.0035sxdxε′′−=(2.2) From Eq. (2.2), 10.0035sdxε′′=−(2.42) At yielding with fy= 460 N/mm2, the strain of compression steel ε's= εy= 0.00219. From Eq. (2.42), 0.00219110.370.00350.0035sdxε′′=−=−=∴Condition for yielding of compression steel (high-yield steel) is 37.0≤′xd(2.43) εs ε’s
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