Material Testing and Evaluation of Steel Mechanical Properties for Classification of Steel Grade of Existing Civil Engineering Structure

Abstract:

The paper is generally focused on the determination and evaluation of yield and ultimate strengths of structural steels, not only current materials but also materials of existing steel structures when the properties are unknown and no material certificates exist. The attention is paid i.a. to the testing and evaluation of steel strengths, especially from the viewpoint of the statistical elaboration of material test results aimed to obtain strength values leading to the reliable structural design [3], in the meaning of general rules according to the European Standards for structural design of civil engineering constructions. The paper deals with actual yield and ultimate strengths obtained using material tests and with characteristic and design strengths based on the test results evaluation versus nominal and design strengths given by European Standards which are used for the structural design in the usual cases when steel grade is known. But in the case of existing structures, very often no information about the material exist that actual values of steel properties shall be determined using material tests and their statistical elaboration to obtain such values of steel properties which lead to the reliable structural design [3], [6], [7]. However, approaches of the derivation of characteristic and design steel strengths using actual test results are principally different from the consideration of nominal and design steel strengths covered by the rules of the European Standards. This paper illustrates the evaluation of the results of material tests performed on the test specimens taken from the steel roof structure of the sport stadium almost 50 years aged, within the diagnostics of load-carrying steel structures of this building [1] aimed to the evaluation of the existing construction [2].

• Periodical: Advanced Materials Research (Volume 651)
• Pages: 274-279
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.651.274
• Online since: January 2013
• Authors: Marcela Karmazínová, Jindrich Melcher
• Keywords: Characteristic, Classification, Design, Evaluation, Existing Civil Engineering Structure, Material Testing, Mechanical Property, Nominal, Steel Grade, Ultimate Strength, Value, Yield Strength

References

[1] M. Karmazínová, J. Melcher, On problems of mechanical properties of structural steel in load-carrying structure of historical building construction, In Proceedings of ICAMME 2012 – Applied Mechanics and Materials, TransTech Publication: 2012, in print. ISSN 1660-9336.

DOI: 10.4028/www.scientific.net/amm.249-250.1103

[2] M. Karmazínová, J. Melcher, Classification of structural steel of existing civil engineering structure based on testing and evaluation of yield and ultimate strengths, In Proc. of ICMEME 2012 – Applied Mechanics and Materials, TransTech Publication: 2012, in print. ISSN 1660-9336.

DOI: 10.4028/www.scientific.net/amm.281.585

[3] M. Karmazínová, J. Melcher, Influence of steel yield strength value on structural reliability, In Proceedings of the 7th WSEAS International Conference on Continuum Mechanics CM '12, held in Kos Island, WSEAS Press: 2012, pp.441-446.

[4] M. Karmazínová, Design assisted by testing – a powerful tool for the evaluation of material properties and design resistances from test results, International Journal of Mathematical Models and Methods in Applied Sciences, Vol. 6, No. 1, 2012, pp.376-385.

[5] EN ISO 6892-1 Metallic materials – Tensile testing – Part 1: Method of test at room temperature, CEN Brussels, (2009).

[6] EN 1990 Basis of structural design (2nd edition), CEN: Brussels, (2011).

[7] EN 1993-1-1 Design of steel structures, Part 1-1: General rules and rules for buildings, CEN: Brussels, (2008).