Title
Effect of strain hardening on the bending capacity of high-strength welded I-section beams
Author
Wong, W.J.
Walters, C.L.
Publication year
2022
Abstract
High-strength steel beams are known to have less plastic rotation capacity than beams with lower yield strengths. This has been related to the decreased strain-hardening ability of high-strength steels, and various rules and standards for steel structures stipulate maximum limits on the allowable yield-to-tensile strength ( y/ u)ratio, which indirectly acts as a measure of strain hardening. The presently prescribed limits are constant for different yield strengths and cross-sectional slendernesses, and a value such as 0.91, 0.94 or 0.95 is typically adopted as a blanket requirement for the steel used in a structure, while the literature suggests that there is an interdependence between rotation capacity, yield strength, strain hardening ability and cross-sectional slenderness. This computational study investigates how the rotation capacity is simultaneously dependent on yield strength, strain hardening ability and cross-sectional slenderness and how each parameter affects the relationship between the others. The results show that, with the geometrical aspect kept constant through the use of normalized slenderness parameters, a higher yield strength leads to higher rotation capacity for a given y/ u ratio, while the well-known decrease of rotation capacity with higher y/ u ratio is confirmed. This suggests the possibility of a more efficient use of high-strength steels with high y/ u ratios when the interdependence of all the variables are accounted for. The results also suggest the importance of accounting for the relative slendernesses of the web and the flange and whether the buckling is web or flange-dominated, since a switch between a web- and flange- dominated buckling response could lead to a reverse in the trend between the rotation capacity and the overall cross-section slendernes
Subject
Yield-to-tensile-strengh ratio
High-strength steels
Plastic hinge
Rotation capacity
Ductility
Plastic buckling
Maritime & Offshore
Energy
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TNO identifier
977986
Source
International Conference on Ships and Offshore Structures ICSOS 2022, 17 19 October 2022, Ålesund, Norway, 1-20
Document type
conference paper