Experimental and numerical research on the critical temperature of laterally unrestrained steel I beams

• Type: Article in International Scientific Journal
• Date: 2005

Authors

Mesquita, LMR (Author) Other; Piloto, PAG (Author) Other; Mário Vaz (Author) FEUP; Paulo Vila Real (Author) Other

Journal

Title: Journal of Constructional Steel Research

Vol. 61

Pages: 1435-1446

ISSN: 0143-974X

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 33 Citations

Scopus - 39 Citations

Other information

Authenticus ID: P-000-14N

DOI: 10.1016/j.jcsr.2005.04.003

Abstract (EN): Lateral unrestrained steel beams when subjected to high temperatures may collapse in service by lateral torsional buckling. This instability state may be predicted in the resistance, temperature and time domain. In this work the beam strength is determined in the temperature domain from a batch of numerical and experimental tests, with a specified degree of utilisation and a typical accident temperature rise. The experimental set-up is a reaction portal frame especially designed for beam elements under elevated temperatures. The specimens were heated by means of electroceramic resistances and a fibre mat specimen cover is used to increase the thermal efficiency. The material and the beam initial state conditions were considered, the experimental procedure being based on constant mechanical action under increasing thermal load. The experimental data was compared with numerical solutions, obtained from a geometric and material nonlinear analysis. A shell finite element modelling, with incremental and iterative procedures, was used in the numerical calculations. Good agreement was obtained between experimental and numerical data. However, both numerical and experimental results lead to higher critical temperatures when compared with the simplified calculation procedure presented in Eurocode for this case.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 12