| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 284218 | Journal of Constructional Steel Research | 2016 | 15 Pages |
•Uncertainties of material property of HSS in China were investigated through collected mill test and independent test data.•A valid FE model was employed to undertake HSS members under bending and combined axial compression and bending.•Uncertainties of resistance model of HSS were investigated through experiment data, FE model calculation and code values.•Design indexes of HSS were gained by reliability analyses.•New constitutive models of HSS under monotonic loading were proposed.
High strength structural steels (HSS) with a nominal yield strength fy ≥ 460 MPa have begun to be applied in many steel structures. This paper focuses on material properties of the HSS fabricated in China and calibration of partial factors for resistance based on the theory of structural reliability. An extensive range of material property data of 500 MPa, 550 MPa and 690 MPa steels produced by major steel manufacturers in China (over 10,000 samples) was collected. Besides, independent material tests were carried out. The statistical parameters of the material properties were then obtained with the influence of test machine types and strain rates being incorporated. Uncertainties of the resistance model of HSS were subsequently investigated through finite element (FE) analyses, including members under axial compression, flexural members and members under combined axial compression and bending. By combining the statistical parameters of both the material properties and the resistance model uncertainties as well as that of geometric properties investigated in the previous research, the statistical parameters of resistance uncertainties of HSS were gained. It may provide a significant statistical evidence for the following reliability analyses. Based on structural reliability theories, partial factors for resistance of HSS were eventually calibrated. As an important part of the Design Specification of High Strength Steel Structures in China, these partial factors for resistance developed herein are helpful for promoting the application of HSS in China. In addition, based on the massive material properties data, a constitutive model of HSS under monotonic loading was suggested.
