Abstract
Based on the conclusion that the effect of normal pressure on temperature distribution and the effect of temperature on soil–concrete interface friction are negligible, the finite-element model was established to analyse the characteristics of a pile enduring cyclic temperatures, adopting the sequential thermal coupling method. The temperature-induced additional displacements and axial forces along the pile depth were analysed, and the influences of temperature on the additional axial force distribution of the energy pile were analysed with different pile head loads. The analysis results showed that cyclic heating and natural cooling will lead to additional axial pile forces and displacements along the pile depth. It was concluded that loads applied at the energy pile top should not be heavier than the value at which plastic deformation at the pile end soil would be initiated and at which non-linear pile top settlement occurred.
Highlights
Analysis of an energy pile enduring cyclic temperature loadsZcone High-tech Pile Industry Holdings Co., Ltd, Ningbo, China (Orcid:0000-0002-2461-9233)
Piles, as one of the most widely used foundations for enhancing the bearing capacity of soil, have been studied by many scholars in the past decades
The finite-element method remains one of the most widely used methods to simulate energy piles subjected to superstructure loads and seasonally cyclic thermal loads over several years, and the results from analyses have shown that the finite-element method is a very effective means to simulate the changes in energy pile characteristics (Di Donna et al, 2016; Wang et al, 2019; Yavari et al, 2014)
Summary
Zcone High-tech Pile Industry Holdings Co., Ltd, Ningbo, China (Orcid:0000-0002-2461-9233). Based on the conclusion that the effect of normal pressure on temperature distribution and the effect of temperature on soil–concrete interface friction are negligible, the finite-element model was established to analyse the characteristics of a pile enduring cyclic temperatures, adopting the sequential thermal coupling method. The temperature-induced additional displacements and axial forces along the pile depth were analysed, and the influences of temperature on the additional axial force distribution of the energy pile were analysed with different pile head loads. The analysis results showed that cyclic heating and natural cooling will lead to additional axial pile forces and displacements along the pile depth. It was concluded that loads applied at the energy pile top should not be heavier than the value at which plastic deformation at the pile end soil would be initiated and at which nonlinear pile top settlement occurred. Cpile specific heat of the pile Csoil specific heat of the soil csoil soil cohesion Epile elastic modulus of the pile Esoil elastic modulus of the soil alpile linear expansion coefficient of the pile alsoil linear expansion coefficient of the soil gpile pile density gsoil soil density lpile pile conductivity lsoil soil conductivity npile Poisson’s ratio of the pile nsoil Poisson’s ratio of the soil Fsoil friction angle of the soil
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