D. P. Chen, C. X. Qian, C. L. Liu,
Volume 8, Issue 4 (12-2010)
Abstract
Concrete deformation due to temperature and moisture condition will always develop simultaneously and interactively. The environmentally (hygral and thermally) induced stress and deformation are essential to concrete durability. To simulate the deformation of concrete caused by the coupling effect of temperature and moisture, a numerical simulation approach is proposed comprising analytical process and finite element analysis is proposed based on the mechanism of heat and moisture transfer in porous medium. In analytical method, Laplace transformation and transfer function were used to simplify and solve the coupled partial differential equations of heat and moisture transfer. The hygro-thermal deformation of concrete is numerically simulated by finite element method (FEM) based on the obtained temperature and moisture stress transformed from the solved moisture distribution. This numerical simulation approach avoids the complex eigenvalues, coupling difficulty and low accuracy in other solving method, and also effectively calculates the moisture induced shrinkage which is almost impossible using familiar FEM software. Furthermore, a software named Combined Temperature and Moisture Simulation System for concrete (CTMSoft) was represented and developed by a mix programming of Visual Basic, Matlab and ANSYS. CTMSoft provided a simple and more intuitive interface between user and computer by providing a graphical user interface (GUI). The validity of the numerical simulation approach was verified by two cases analysis.
D.p. Chen, C.w. Miao, J.p. Liu, M.s. Tang,
Volume 13, Issue 3 (9-2015)
Abstract
This paper presents theoretical and numerical state-of-the-art information in the field of hygro-thermo-mechanical
deformation simulation in structural concrete. The aspects discussed include coupled hygro-thermo-mechanical performance
of porous materials including concrete, multi-scale simulation of concrete properties especially the volumetric and structural
deformation performance, and the multi-scale simulation of concrete under the coupling effect of multi-physics fields. The
multi-scale simulation section includes the multi-scale simulation of composition and structure in concrete, the multi-scale
simulation of concrete’s mechanical performance, and the multi-scale simulation of durability concerned performance of
concrete. This paper presents an overview of the work, of which data from early 80 recent studies, carried out on the multiscale
simulation of hygro-thermo-mechanical deformation performance of structural concrete. The relating previous studies
and analysis showed that sufficient data have been obtained to give confidence in simulating hygro-thermo-mechanical
performance of concrete based on the theory of heat and mass transfer in porous media, and the clear relationships have been
obtained between moisture-heat transfer and hygro-thermal distribution at different scale. It is necessary to make further
systematic multi-scale research on the relationship between micro-structure and property parameters of cement paste, threephase
basic properties at meso level of concrete and the performance of concrete structures, which makes important practical
significance to solve the crack of large-area and mass concrete structure and improve the durability of concrete structures
