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- W2468968511 abstract "In this work a numerical investigation is conducted in an attempt to clarify understanding of these behaviours. In order to achieve this and capture t he complex behaviour of concrete under heating, a multi-phase, hygro-thermo-mechanical (HTM) material description is adopted with strong coupling between the separately treated solid skeleton, liqu id water and gas phases, in a detailed and fully generalised (3D) finite element implementation [9, 10]. In the mathematical formulation, the mechanical behaviour of the solid skeleton is model led by way of total strain formulation in which elastic, free thermal and load induced thermal stra in components are considered. The development of (micro) fracturing in the concrete and the associat ed reduction in stiffness are accounted for by an isotropic thermo-mechanical damage model in which the degradation of the material due to both mechanical and thermal loading is accounted for. F ollowing Peerlings et al. [11] a modified von Mises description is adopted for the equivalent str ain measure. The treatment of the liquid phase considers liquid water in pores, water dehydrated f rom the solid skeleton and adsorbed water physically bound to the surface of solid skeleton. The gas phase is treated as a mixture of dry air a nd water vapour. Liquid water flow is assumed to be p ressure dependent, according to Darcy's law, while gas flow is assumed to be both pressure and concent ration dependent, according to Fick's law. Coupling between the hygro-, thermo- and mechanical components of the model allows for the internal pore pressures to be considered within the stress term and, for the effects of material degradation on mass transport to be captured. Most of the material properties (strengths, Young’s modulus, thermal conductivity, heat capacity, poros ity, permeability etc.) are variable (typically, ei ther directly or indirectly, as a function of temperatur e). The series of numerical experiments conducted here, considered the examples of a wall, a square column and an I-beam, and were conducted in order to investigate the relative roles of thermally induced stresses and pore pressures in the developm ent of damage and hence spalling. The experiments consisted of parametric studies where p ermeabilities and moisture contents, which are key to the development of pore pressures, were exte nsively varied. The significance of other key properties (such as strength, ductility, etc.), whi ch are related to the formulation of the damage mod el, were also considered. Typical results for the squa re column example are shown in Figure 1." @default.
- W2468968511 created "2016-07-22" @default.
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- W2468968511 date "2010-03-16" @default.
- W2468968511 modified "2023-09-24" @default.
- W2468968511 title "Numerical investigation of damage and spalling in concrete exposed to fire" @default.
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- W2468968511 doi "https://doi.org/10.1201/b10546-93" @default.
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