Abstract
At elevated temperatures, the mechanical properties of high strength steel (HSS) reported in the literature have an observable scatter. They differ from design code values that are mainly based on experiments on mild steel. In this paper, the mechanical properties of S700 MC at elevated temperatures were investigated with steady state and transient state tensile tests. The reduction factors of yield strength started to decrease from 100 °C onwards, while the EN 1993-1-2 values have no decrease up to 400 °C. The reduction factors of proportional limit were below the code values up to 200 °C. The modulus of elasticity was consistent when using both monotonic and repeated loading but differed from the code values. Further comparisons of the mechanical properties of steels with the same strength grade with the values in the literature confirm the importance of testing HSSs produced with different manufacturing processes. The constitutive equations and representative material models proposed for S700 MC also support the implementation of a performance-based approach to structural fire safety design.
Highlights
The loss of structural stability in steel frame buildings during fire exposure has resulted in economic losses, human casualties, and envi ronmental pollution [1,2]
In order to accelerate the transition to the performance-based structural fire safety design (PBSFSD) approach, material properties of high strength steel (HSS) at elevated temperatures are needed to increase the reliability of material modelling
Mechanical properties for S700 MC steel were pre sented based on the results obtained from both transient state and steady state tests
Summary
The loss of structural stability in steel frame buildings during fire exposure has resulted in economic losses, human casualties, and envi ronmental pollution [1,2] Such catastrophic incidents have prompted researchers to move from the traditional prescriptive design to a performance-based structural fire safety design (PBSFSD). Studies on steels having a yield strength close to 700 N/mm2 [6,7,8,9,10,11,12,13,14] point out that reduction factors for mechanical properties differ from the values provided in design standards like EN 1993-1-2 [15] This is especially true for the modulus of elasticity. These variations indicate that the reduction factors provided in design standards like EN 1993-1-2 ought to be calibrated or updated when defining the material properties for different HSSs
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