Acier Corten

vignette|Acier Corten. L'acier Corten, aussi appelé acier patinable, acier auto-protecteur, ou encore acier intempérique au Québec, est un acier à corrosion superficielle provoquée. Il est utilisé en architecture, en paysagisme, en construction et en sculpture d'extérieur, pour son aspect et sa résistance aux conditions atmosphériques. L'oxydation de l'acier Corten se réalise naturellement en six mois puis se stabilise dans le temps, mais certains professionnels utilisent de l'accélérateur de rouille pour parvenir à rouiller la surface en moins d'une heure. Normalisation Initialement, l'alliage Acier Corten était connu comme A242 (COR-TEN A), nom donné par l'organisme de normalisation ASTM International sur la base des deux caractéristiques principales du matériau : « CORrosion resistance and TENsile strength », soit « résistance à la corrosion et en traction ». Aujourd'hui les alliages généralement en production et utilisation sont les aciers Corten A et B, désignés respec

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Experimental study of residual stresses in thick steel plates

Jean-Paul Lebet, Raphaël Thiébaud

Residual stresses must be taken into account when evaluating the stability of a steel bridge girder. Residual stresses are unavoidable, as manufacturing processes for steel plates introduce thermal residual stresses in the material. For welded built-up sections, such as those commonly used in large steel plate girders, these thermal residual stresses are due to 1) cooling after rolling, 2) flame cutting of the flanges, and 3) welding between the web and the flange. Residual stresses can influence the lateral torsional buckling resistance of structural steel members and need to be considered in design. This paper experimentally investigates residual stresses due to flame cutting using the sectioning method. In this study, residual stresses are measured after flame cutting and welding 60 mm thick steel (S355N) flanges, a typical size used in the fabrication of bridge girders. Results from flame cutting confirm the findings of previous studies which reveal that residual stress distributions have a high tensile component at the flame cut edge. Procedures and testing of welding residual stresses are also presented. Residual stress measurements from this study could be used to develop a longitudinal and through-thickness residual stress model for thick flame-cut plates and welded plates used in bridge I-girder construction. Such a model could serve as an initial state in non-linear finite element analyses to predict the residual stress influence on the LTB of steel bridge girders.

2012

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Experimental Study on Cyclic Behaviors and Restoring Force Characteristics of Concrete Filled Steel Tube Columns Using Ultra-High Strength Steel

Hiroyuki Inamasu

H-SA700 is a type of new ultra-high-strength structural steel that is more environmentally friendly and more suitable for mass production than conventional high-strength steel. The objective of this paper is to contribute to the practical application of CFT columns using such ultra-high-strength as a means to provide a significant increase in the seismic capacity of building structures. In this paper, the cyclic behavior of concrete filled steel tubes (CFTs) using H-SA700 was investigated experimentally. H-SA700 offers an approximately three time higher yield strain than that of conventional steel, and therefore, the CFT columns using H-SA700 reached their elastic limit when the infilled concrete sustained compressive strength, while the steel tube remained elastic at the moment. In such a case, it is unsafe to evaluate the strength by using the current design formula based on the superposed strength method. Due to the relatively low ductility of H-SA700, steel is not allowed to yield in the design of CFT columns. Nevertheless, the experimental results revealed that, comparing with CFT columns using conventional steel, the CFT columns using H-SA700 exhibited a substantially large capacity of plastic deformation, smaller axial deformation associated with local buckling, and a similar capacity of energy dissipation.

International Association of Earthquake Engineering2017

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Experimental Behavior of Concrete-Filled Steel Tube Columns Using Ultrahigh-Strength Steel

Hiroyuki Inamasu

Concrete-filled steel tube (CFT) columns offer significant advantages over columns made of either steel or concrete alone, such as large energy dissipation and increased strength and stiffness. To further improve the seismic performance of these columns, an experimental investigation was conducted into CFT columns using ultrahigh-strength steel. More specifically, seven square and circular specimens made with high-strength and conventional steel were subjected to constant compressive axial load and cyclic flexural load protocols with two and 20 cycles imposed at each drift level. Based on the test results, the influence on the CFT’s cyclic behavior of the high-strength steel, crosssectional shape, axial load, and number of cycles in lateral loading history was studied. In comparison with the conventional steel specimens, larger elastic deformation, higher strength, and delay of local buckling were observed in the high-strength steel specimens, while compared with the circular specimens, the square specimens sustained larger drift angles without fracture of their steel tubes because of the development and progress of serious local buckling. Furthermore, a simple analytical model based on the concept of the superposed strength method was proposed. The accuracy of this model was confirmed with the experimental results.

2016

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Acier

Un acier est un alliage métallique constitué principalement de fer et de carbone. Il se distingue des fontes et des ferroalliages par sa teneur en carbone comprise entre 0,02 % et 2 % en masse. C’est

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