5º CILASCI – Congresso Ibero-Latino-Americano sobre Segurança contra Incêndio Porto, Portugal, 15 a 17 de julho de 2019 NUMERICAL ANALYSIS OF CELLULAR STEEL BEAMS FAILURE MODES IN FIRE CONDITIONS Jaqueline Alves da Silva Master student IPB, UTFPR Paola Regina Dalcanal Professor UTFPR-Paraná Luís Manuel R. de Mesquita * Professor IPB-Bragança Keys-word: Cellular beams; Fire Resistance; Failure modes; Numerical modelling. 1. INTRODUCTION Cellular beam generally originates from steel hot-rolled I-section member, which the web is cut, displaced and subsequently welded (Westok method) to obtain openings in the web spaced regularly, with different forms like circular, sinusoidal or hexagonal, see Figure 1. The procedure results in a deeper beam, approximately 40-60% deeper than its parent solid section, [1]. This type of beam is increasingly used because it is capable to support long spans, it can have a bending resistance up to 2.5 times higher than its parent section and its openings allow the passage of technical equipment and ventilation systems through their web, which reduces the floor height and therefore the overall height of building. The presence of the opening influences in the failure modes of the beam. Vierendeel mechanism and web post buckling (WPB) are examples of failure modes originate due the openings, while already existing failure modes on solid beams are modified in cellular beams, such as lateral- torsional buckling (LTB), [2]. Besides that, exposure to high temperatures has a detrimental effect on the steel resistance, which added to the initial imperfections of the beam results in the combination of failure modes previously mentioned. For that reason, the main purpose of the study will be to define the failure modes, in particular WPB and LTB, and the beam resistance, relating the temperature with variant geometric * Luis Mesquita – Aplied Mechanics Department, Polytechnic Institute of Bragança. Campus Santa Apolónia, 5301-857 Bragança. Telef.: +351 273 303061, Fax: +351 273 303116, E-mail: [email protected] CORE Metadata, citation and similar papers at core.ac.uk Provided by Biblioteca Digital do IPB
NUMERICAL ANALYSIS OF CELLULAR STEEL BEAMS FAILURE MODES IN FIRE CONDITIONS
Jun 26, 2023
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