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A numerical method for calculating hygro-thermal deformation of concrete, part I: the principle of the calculation method



Title: A numerical method for calculating hygro-thermal deformation of concrete, part I: the principle of the calculation method
Author(s): C. Qian, D. Chen, Y. Zhuang
Paper category : conference
Book title: International Conference on Microstructure Related Durability of Cementitious Composites
Editor(s): W. Sun, K. van Breugel, C. Miao, G. Ye and H. Chen
Print-ISBN: 978-2-35158-065-3
e-ISBN: 978-2-35158-084-4
Publisher: RILEM Publications
Publication year: 2008
Pages: 1139 - 1148
Total Pages: 10
Nb references: 10
Language: English


Abstract: 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 calculation method 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 in Laplace domain. Then the moisture and temperature distribution in time domain yields by inverse Laplace transformation. 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. The calculation of concrete hygrothermal deformation by analytical and FEM method 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 softwares.
Furthermore, a software named Coupling Temperature and Moisture Simulation System for concrete (CTMSoft) was represented and developed by a mix programming. And this software provided a simple and more intuitive interface between user and computer by providing a graphical user interface(GUI).


Online publication: 2009-06-09
Publication type : full_text
Public price (Euros): 0.00