Nonlinear analysis of reinforced concrete cross-sections exposed to fire

A nonlinear structural analysis of cross-sections of three-dimensional reinforced concrete frames exposed to fire is presented. The analysis includes two steps: the first step is the calculation of the transient temperature field in cross-sections exposed to fire and the second step is the determina...

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Bibliographic Details
Published in:Fire safety journal 2007-03, Vol.42 (2), p.139-149
Main Authors: Capua, Daniel Di, Mari, Antonio R.
Format: Article
Language:English
Subjects:
Applied sciences
Building structure
Building technical equipments
Buildings
Buildings. Public works
Computation methods. Tables. Charts
Concrete fire resistance
Construction (buildings and works)
Exact sciences and technology
Fire analysis
Fire behavior of materials and structures
Fire protection
Moisture content
Reinforced concrete structure
Structural analysis. Stresses
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Summary:A nonlinear structural analysis of cross-sections of three-dimensional reinforced concrete frames exposed to fire is presented. The analysis includes two steps: the first step is the calculation of the transient temperature field in cross-sections exposed to fire and the second step is the determination of the mechanical response due to the effect of thermal and mechanical load. A nonlinear finite-element procedure is proposed to predict the temperature field history. In this thermal analysis, the effect of moisture has been taken into account by introducing a water vapor fraction function to define the variation of enthalpy. A mechanical nonlinear analysis of the cross-sections is performed for each temperature distribution and for the applied exterior load using an algorithm of arc-length control. The mechanical and thermal properties of concrete and steel are taken according to the European Standard ENV 1991-1-2 [ENV. Eurocode 2, design of concrete structures, part 1–2: general rules—structural fire design. ENV 1992-1-2, 1995]. In order to validate the proposed thermal and mechanical models, comparisons between numerical and experimental results have been performed. The agreement found is in both cases, fairly good. In addition, a numerical example of the structural analysis of several cross-sections of a reinforced concrete waffle slab under external load and fire is shown.
ISSN:0379-7112
DOI:10.1016/j.firesaf.2006.08.009