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Required Properties of High-Performance Steels.


pdf icon Required Properties of High-Performance Steels. (5483 K)
Galambos, T. V.; Hajjar, J. F.; Earls, C. J.; Gross, J. L.

NISTIR 6004; 98 p. May 1997.

Available from:

National Technical Information Service
Order number: PB97-167381

Keywords:

bridges (structures); building technology; codes; design applications; elastic design; high strength steel; plastic design; seismic design; steels

Abstract:

This report presents the results of a study of high-performance steels with yield stress values between 480 MPa and 609 MPa (70 ksi and 100 ksi). These materials are a new family of constructional steels. The impetus for the study was the need for the determination of the applicability of these steels for use with current structural design specifications for buildings and bridges. The following sources were considered in the study: the technical and scientific literature on the development of the current design requirements; discussion from a workshop on the topic of the new materials; and numerical studies performed for this project. The main conclusion from this investigation is that the use of high-performance steels for civil engineering structural applications is feasible, but that considerable data obtainable from steel mills and from further research, combined with technical and economic studies, are needed. In particular, experimental and finite element studies should be performed to define the compactness properties of sections, and the rotation capacity, as well as the rotation requirements, of members and frames. Sufficient statistical information on material properties needs to be amassed so that the probabilistic factors in the design specifications can be re-calibrated for the high-performance steels. Special emphasis in the required research should be placed on the behavior of bolted connections under monotonic and cyclic loads. The report concludes with a list of research recommendations.