3.4. Residual stress measurement results
Themeasured results of residual stress fromthe non-destructive test method are presented in Fig. 18. The normalized plots in Fig. 19 indicate that both the distribution and the magnitude for the SM490 specimen are similar to those assumed in the AISC Specification. Based on these very limited measurements, however, the residual stress for 800 MPa specimen is about 10% of the yield stress. The magnitude of residual stresses measured from high-strength steel box shapes by Uy [14] was also about 5 to 10% of the measured yield stress. The residual stress measurements reported by Rasmussen and Hancock [1] showed that the residual stress is independent of the yield stress of steel, although it is highly variable.