The yield strength of Fe 345 structural steel as per IS 2062 is:

Why is this the answer?

Fe 345 in IS 2062 has a minimum yield stress of 345 MPa for thickness ≤ 20 mm. IS 800 uses this as the basis for design. Grade name directly gives the yield stress. Design yield stress = fy/γm0 = 345/1.10 = 313.6 MPa.

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