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A branch-switching procedure for analysing instability of steel structures subjected to fire
Univ Trento, Dept Civil Environm & Mech Engn, Via Mesiano 77, I-38123 Trento, Italy..
Univ Trento, Dept Civil Environm & Mech Engn, Via Mesiano 77, I-38123 Trento, Italy..
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering.
2018 (English)In: Structural Engineering and Mechanics, ISSN 1225-4568, E-ISSN 1598-6217, Vol. 67, no 6, p. 629-641Article in journal (Refereed) Published
Abstract [en]

The paper describes the development of a two-dimensional (2D) co-rotational nonlinear beam finite element that includes advanced path-following capabilities for detecting bifurcation instability in elasto-plasticity of steel elements subjected to fire without introducing imperfections. The advantage is twofold: i) no need to assume the magnitude of the imperfections and consequent reduction of the model complexity; ii) the presence of possible critical points is checked at each converged time step based on the actual load and stiffness distribution in the structure that is affected by the temperature field in the elements. In this way, the buckling modes at elevated temperature, that may be different from the ones at ambient temperature, can be properly taken into account. Moreover, an improved displacement predictor for estimating the displacement field allowed significant reduction of the computational cost. A co-rotational framework was exploited for describing the beam kinematic. In order to highlight the potential practical implications of the developed finite element, a parametric analysis was performed to investigate how the beam element compares both with the EN1993-1-2 buckling curve and with experimental tests on axially compressed steel members. Validation against experimental data and numerical outcomes obtained with commercial software is thoroughly described.

Place, publisher, year, edition, pages
TECHNO-PRESS , 2018. Vol. 67, no 6, p. 629-641
Keywords [en]
branch-switching procedure, path-following technique, instability analysis, flexural buckling, co-rotational formulation, steel structures, fire, geometrical imperfections
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-235571DOI: 10.12989/sem.2018.67.6.629ISI: 000444976400007Scopus ID: 2-s2.0-85053564314OAI: oai:DiVA.org:kth-235571DiVA, id: diva2:1252269
Note

QC 20181001

Available from: 2018-10-01 Created: 2018-10-01 Last updated: 2018-10-16Bibliographically approved

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