An Engineering Heat and Mass Transport Model Utilized for Concrete at Fire

An Engineering Heat and Mass Transport Model Utilized for Concrete at Fire

Scopus Article

Mathematical models which can sufficiently describe processes proceeding in concrete during fire play an important role when assessing a load bearing capacity of concrete structures. In this paper a coupled heat and mass transport model based on principles of conservation of mass and energy is presented. A 2D computational solver using FEM was created to find three unknowns – a temperature, an amount of free water and a magnitude of pore pressure in concrete cross section during rapid heating. These variables, mutually connected through state equation, are necessary not only for determination the load bearing capacity of concrete element but also for prediction of concrete spalling. A parametric study of numerical results influenced by material properties of concrete (e.g. permeability, thermal conductivity) and initial conditions (e.g. relative humidity, temperature) is introduced and discussed in the end.

Mathematical models which can sufficiently describe processes proceeding in concrete during fire play an important role when assessing a load bearing capacity of concrete structures. In this paper a coupled heat and mass transport model based on principles of conservation of mass and energy is presented. A 2D computational solver using FEM was created to find three unknowns – a temperature, an amount of free water and a magnitude of pore pressure in concrete cross section during rapid heating. These variables, mutually connected through state equation, are necessary not only for determination the load bearing capacity of concrete element but also for prediction of concrete spalling. A parametric study of numerical results influenced by material properties of concrete (e.g. permeability, thermal conductivity) and initial conditions (e.g. relative humidity, temperature) is introduced and discussed in the end.

concrete, fire, pore pressure, free water, temperature, parametric study

concrete, fire, pore pressure, free water, temperature, parametric study

MATUŠÍKOVÁ, A.; ROZEHNALOVÁ, P.; GIRGLE, F.; KOSTIHA, V.; ŠTĚPÁNEK, P.

2018

14.06.2017

Trans Tech Publications

Switzerland

1662-9795

Key Engineering Materials (web)

738

58

Swiss Confederation

58

68

11