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Viscous Creep of Steel Structures in Fire
Author(s) -
Srpčič S.
Publication year - 2000
Publication title -
zamm ‐ journal of applied mathematics and mechanics / zeitschrift für angewandte mathematik und mechanik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.449
H-Index - 51
eISSN - 1521-4001
pISSN - 0044-2267
DOI - 10.1002/zamm.200008014147
Subject(s) - creep , statically indeterminate , materials science , structural engineering , softening , nonlinear system , beam (structure) , finite element method , mechanics , composite material , engineering , physics , quantum mechanics
When analysing the mechanical behaviour of steel structures at high environmental temperatures as expected in real fire, the viscous creep deformations may play a significant role. The paper presents the nonlinear analysis of steel planar beams and frames, subjected to time dependent temperature and mechanical loadings. In the FEM‐based numerical procedure, the viscous part of the total strain increment is described by the Williams‐Leir modification of Harmathy's equation of nonlinear viscous creep of steel. The numerical example shows the influence of the creep intensity on the mechanical response of a steel beam structure in hypothetical fire. Due to the creep softening, considerable increase of deflections can be expected at statically determinate structures and significant stress redistributions at statically indeterminate ones.