» عنوان : Thermal and Thermal-Mechanical Analysis of Thermo-Active PileFoundations
زبان : انگلیسی
تعداد صفحات : ۱۰۲
Thermo-active foundations make use of shallow geothermal energy to heat or cool buildings. By making use of this green and renewable energy form, this technology can significantly reduce buildingenergyand maintenance costs in the long term and reducecarbon dioxide emissions. However, a complete understanding of the thermal-mechanical behaviour of such foundations has not yet been achieved which has been amajor obstacle to the uptake and the industrial development of this technology. A thermal and thermal-mechanical numerical study of a thermal active pile was performed in this thesis using the finite element software Abaqus. The t hermal analysis focused on some of the modelling aspects of the problem such as the simulation of the heating of the pile and definition of the ground surface temperature. The thermal-mechanical analysis studied the effect, in terms of thermally induced stresses in the pile, of the relationship between soil and concrete coefficients of thermal expansion , ofthe ground surface temperature and of the pile length to diameter ratio. The relationship between soil and concrete coefficient ofthermal expansion coefficients was found to have a key role in the observed behaviour of the pile affecting both the direction (compression/tension), and the magnitude of the developed thermally induced stresses in the pile. The ground surface temperature showed an important effect when the soil was more thermally expansive than concrete, leading to considerable further stress changes in thepile. An increase in the pile length to diameter ratio also led to an increase of the thermally induced stresses in the pile.