Publication

The new Chapter 9 of Eurocode 8 Part 3 for Seismic Assessment of Existing Steel Structures

Dimitrios Lignos
2023
Conference paper
Abstract

The seismic assessment of existing steel structures necessitates the development of practice- oriented engineering models for use in nonlinear static and dynamic analysis procedures. These models should encompass the full range of the anticipated nonlinear behaviour of structural steel elements. Within such a context, this paper provides an overview of the newly developed Chapter 9 of Eurocode 8 Part 3. This chapter includes a comprehensive list of component models that idealize the nonlinear behaviour of the primary and secondary structural steel elements, including columns, steel and composite steel beams, beam-to- column joints, and steel bracings among others. The resistance and deformation models for seismic assessment rely on experimental data, which were systematically collected and curated in structural performance databases over the past two decades within the research group of the author. The paper summarizes some of these models for the nonlinear modeling of both code compliant and noncompliant structural steel elements. A publicly available web-based module has been developed that facilitates the use of the proposed models.

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Related concepts (33)
Steel
Steel is an alloy of iron and carbon with improved strength and fracture resistance compared to other forms of iron. Many other elements may be present or added. Stainless steels, which are resistant to corrosion and oxidation, typically need an additional 11% chromium. Because of its high tensile strength and low cost, steel is used in buildings, infrastructure, tools, ships, trains, cars, bicycles, machines, electrical appliances, furniture, and weapons. Iron is the base metal of steel.
Stainless steel
Stainless steel, also known as inox or corrosion-resistant steel (CRES), is an alloy of iron that is resistant to rusting and corrosion. It contains at least 10.5% chromium and usually nickel, and may also contain other elements, such as carbon, to obtain the desired properties. Stainless steel's resistance to corrosion results from the chromium, which forms a passive film that can protect the material and self-heal in the presence of oxygen. The alloy's properties, such as luster and resistance to corrosion, are useful in many applications.
Nonlinear optics
Nonlinear optics (NLO) is the branch of optics that describes the behaviour of light in nonlinear media, that is, media in which the polarization density P responds non-linearly to the electric field E of the light. The non-linearity is typically observed only at very high light intensities (when the electric field of the light is >108 V/m and thus comparable to the atomic electric field of ~1011 V/m) such as those provided by lasers. Above the Schwinger limit, the vacuum itself is expected to become nonlinear.
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