A contribution to the explanation of the spalling of concrete elements subjected to elevated temperature

作者：de Morais Marcus V G^*; Pliya Prosper; Noumowe Albert; Beaucour Anne Lise; Ortola Sophie

来源：European Journal of Environmental and Civil Engineering, 2009, 13(1): 71-90.

DOI：10.3166/EJECE.13.71-90

• concrete
• temperature
• thermal gradient
• thermohydrical calculation
• elastoplastic behaviour
• thermal stresses

We study the behavior of concrete subjected to high temperature. It aims to explain the spalling phenomenon observed during experiments. Mechanical computations are carried out with the finite element code CAST3M developed at the French Atomic Energy Agency (CEA). The stresses are expressed according to the heat gradient and water vapor pressure inside the specimens, preliminary evaluated using thermo-hydrous calculations. The generated mechanical stresses are calculated according to two assumptions of behavior: the linear isotropic elastic law and an elasto-plastic model. Numerical simulations show that, during the healing cycles, tension stresses are developed in the central part of the cylindrical specimens and compression stresses at their surface. The higher stresses appear when the surface temperature of the specimens is about 300 degrees C The numerical tension stresses in the specimens then exceed the concrete tensile strength.

• 出版日期2009