[1] Chen Depeng, Qian Chunxiang,. Numerical simulation of concrete shrinkagebased on heat and moisture transfer in porous medium [J]. Journal of Southeast University (English Edition), 2007, 23 (1): 75-80. [doi:10.3969/j.issn.1003-7985.2007.01.016]
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Numerical simulation of concrete shrinkagebased on heat and moisture transfer in porous medium(
)
基于多孔介质湿热迁移的混凝土收缩数值模拟
)Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]
- Volumn:
- 23
- Issue:
- 2007 1
- Page:
- 75-80
- Research Field:
- Materials Sciences and Engineering
- Publishing date:
- 2007-03-30
Info
- Title:
- Numerical simulation of concrete shrinkagebased on heat and moisture transfer in porous medium
- 基于多孔介质湿热迁移的混凝土收缩数值模拟
- Author(s):
- Chen Depeng; Qian Chunxiang
- School of Materials Science and Engineering, Southeast University, Nanjing 211189, China
- PACS:
- TU528.01
- DOI:
- 10.3969/j.issn.1003-7985.2007.01.016
- Abstract:
- To simulate the concrete shrinkage in varying temperature and moisture environments, a simulate procedure comprising an analytical process and a finite element analysis is proposed based on the coupled partial differential equations describing heat and moisture transfer in a porous medium.Using the Laplace transformation method and transfer function to simplify and solve the coupled equations in Laplace domain, the moisture and temperature distribution in time domain are obtained by inverse Laplace transformation.The shrinkage deformations of concrete are numerically simulated by the finite element method(FEM)based on the obtained temperature and moisture distribution.This approach avoids the complex eigenvalues, coupling difficulty and low accuracy found in other solving methods, and also effectively calculates the moisture induced shrinkage which is almost impossible using familiar FEM software.The validity of the simulation procedure is verified by Hundt’s test data.The results reveal that the proposed approach can be considered a reliable and efficient method to simulate the coupling moisture and temperature shrinkage of concrete.
- 为了对处于环境温、湿度中的混凝土的收缩变形进行有效数值模拟分析, 提出了一种数值解析与有限元分析相结合的方法.根据多孔介质热质传输原理描述混凝土中湿热迁移过程的耦合偏微分方程组, 借助Laplace变换及传递函数将其简化为拉氏域内的简单微分方程并求解, 然后通过Laplace逆变换得到物理空间内的温度和含湿量.在此基础上利用有限元分析方法得到混凝土湿热耦合收缩变形.该方法克服了其他求解过程中特征值复杂、耦合困难及准确性差的问题, 并有效解决了现有有限元软件难以处理湿度应力及变形的难题.以Hundt试验为算例的数值计算表明, 模拟结果与试验数据具有良好的相关性.
References:
[1] Pandey R N, Srivastava S K, Mikhailov M D.Solutions of Luikov equations of heat and mass transfer in capillary porous bodies through matrix calculus:a new approach [J].International Journal of Heat and Mass Transfer, 1999, 42(14):2649-2660.
[2] Gaur R C, Bansal N K.Effect of moisture transfer across building components on room temperature [J].Building and Environment, 2002, 37(1):11-17.
[3] Chang W J, Weng C I.Analytical solution to coupled heat and moisture diffusion transfer in porous materials [J].International Journal of Heat and Mass Transfer, 2000, 43(19):3621-3632.
[4] Cheroto S, Guigon S M S, Ribeiro J W, et al.Integral transform solution of Luikov’s equations for heat and mass transfer in capillary porous media [J].Drying Technology, 1997, 15:811-835.
[5] Pandey R N, Pandey S K, Ribeiro J W.Complete and satisfactory solutions of Luikov equations of heat and moisture transport in a spherical capillary-porous body [J].International Communications in Heat and Mass Transfer, 2000, 27(7):975-984.
[6] Grasley Z C, Lange D A.Modeling drying shrinkage stress gradients in concrete [J].Cement, Concrete and Aggregates, 2004, 26(2):115-122.
[7] Bentz D P, Garboczi E J, Quenard D A.Modeling drying shrinkage in reconstructed porous materials:application to porous vycor glass [J].Modeling and Simulation in Materials Science and Engineering, 1998, 6(3): 211-236.
[8] Grasberger S, Meschke G.A hygro-thermal-poroplastic damage model for durability analyses of concrete structures [C]//Proceedings of the European Congress on Computational Methods in Applied Sciences and Engineering.Barcelona, 2000:1-19.
[9] Han M Y, Lytton R L.Theoretical prediction of drying shrinkage of concrete [J].Journal of Materials in Civil Engineering, 1995, 7(4):204-207.
Memo
- Memo:
- Biographies: Chen Depeng(1978—), male, graduate;Qian Chunxiang(corresponding author), female, doctor, professor, cxqian@seu.edu.cn.