Comparative Study of Built-Up Members Subjected to Compression Loads, by the EC3-1 and AISC 360-05

• Type: Article in International Conference Proceedings Book
• Date: 2014

Authors

Fabio Moutinho Paiva (Author) FEUP; Jorge Henriques (Author) FEUP; Rui Barros (Author) FEUP

Conference proceedings International

Title: EUROSTEEL

Other information

DOI: 10.13140/2.1.1674.7200

Abstract (EN): Uniform built-up members (built-up columns or built-up beam-columns) are made by the connection of two or more metallic sections (chords members) by means of a lacing system (web members) thus obtaining a more resistant section and less deformable. This members are often used in steel buildings and in bridges constructions, with significant economic justifications. Unlike structural elements with a solid web, certain additional effects must be considered in the design of built-up members subjected to compression loads. The main effects that should be considered, are the shear effect due to the reduced shear stiffness of these members, and the compound buckling, that is the interaction between global and local buckling modes in the presence of imperfections. EC3-1 considers the built-up uniform members (bars or beams-column) as Timoshenko structural members (bars or Timoshenko beam-columns) to take into account the transversal deformation and provides guidance for determining the design value of the buckling resistance of the chord only for elements with hinged ends and laterally supported. The EC3-1 does not mention how to approach interaction phenomena between buckling modes. In turn the American Standard AISC 360-05 presents a simple checking formula to ensure that this effect can be ignored in the design. This paper describes the design methodology inherent in these regulations (EC3-1 and AISC 360-05) and the current existing limitations. A set of assessments of the buckling resistance of some built-up members subjected to axial compression takes up later. The paper ends up with the most relevant conclusions of the performed calculations and some observations of the limitations of applying the current design methodologies in the codes to more complex cases.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 6