Bending resistance of steel beams with corrugated web under fully developed fire
Mariusz Maślak
Department of Steel Structures; Faculty of Civil Engineering; Cracow University of Technology (Poland)
https://orcid.org/0000-0003-3592-429X
Krzysztof Kuchta
Department of Metal Structures; Faculty of Civil Engineering; Cracow University of Technology (Poland)
https://orcid.org/0000-0002-7924-7297
Marcin Łukacz
Faculty of Civil Engineering; Cracow University of Technology; PhD student (Poland)
Abstract
More accurate design algorithm helpful in bending resistance evaluation of steel beams with corrugated web exposed to fully developed fire is presented and discussed in detail. The condition of fire resistance limit state is proposed to be determined by the interactive formula based on the consideration of biaxial bending in which the transverse out-of-plane bending phenomenon is the spatial effect of in-plane shear. Such an influence, usually neglected in formal models dealing with the persistent design situation, can become more significant under fire conditions, when the steel yield point decreases as a consequence of the flanges temperature growth. Dependence between the material temperature and the global instability factors is considered in the methodology proposed by the authors, especially with relation to the assessment of the adequate values of lateral – torsional buckling coefficient as well as of flexural transverse buckling coefficient specified for the compressed flange. The conclusive safety condition should be supplemented by the additional interactive component in which the influence of the axial compression force is expressed, in the case when such internal force is induced in a considered beam as a result of thermal strains constrainment.
Keywords:
resistance, stability, bending, corrugated web, fully developed fire, fire resistanceReferences
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Authors
Mariusz MaślakDepartment of Steel Structures; Faculty of Civil Engineering; Cracow University of Technology Poland
https://orcid.org/0000-0003-3592-429X
Authors
Krzysztof KuchtaDepartment of Metal Structures; Faculty of Civil Engineering; Cracow University of Technology Poland
https://orcid.org/0000-0002-7924-7297
Authors
Marcin ŁukaczFaculty of Civil Engineering; Cracow University of Technology; PhD student Poland
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