Boolean-Based Surface Procedure for the External Heat Transfer Analysis of Dams during Construction

The external heat transfer of dams during construction is complex because such transfer is location specific and time varying. An external thermal model is developed in this paper. Five types of external heat flux are considered in the mathematical model: air-side convection, electromagnetic radiation, absorbed solar input, water-side convection, and surface insulation effect. A method for extracting and classifying the external surfaces of dams on the basis of Boolean operations is proposed. Heat transfer conditions can be automatically set up for each step according to the proposed method, and the method can be used as a preprocessing facility for finite element analysis. A 285 m high arch dam in Southwest China is examined as a study case. The model is implemented and found to correctly identify different types of external surfaces. Simulation result agrees well with the monitored temperatures.

[1]  D. Thevenard,et al.  Ground reflectivity in the context of building energy simulation , 2006 .

[2]  Roberto Scotta,et al.  Stress Analysis of Concrete Structures Subjected to Variable Thermal Loads , 1995 .

[3]  Feng Jin,et al.  Practical procedure for predicting non-uniform temperature on the exposed face of arch dams , 2010 .

[4]  Mohsen Ghaemian,et al.  Effects of Environmental Action on Thermal Stress Analysis of Karaj Concrete Arch Dam , 2006 .

[5]  H. Demir.  Experimental and numerical studies of natural convection from horizontal concrete cylinder heated with a cylindrical heat source , 2010 .

[6]  Mengfei Yang,et al.  Prediction of water temperature in stratified reservoir and effects on downstream irrigation area: A case study of Xiahushan reservoir , 2012 .

[7]  Y. Ballim,et al.  A numerical model and associated calorimeter for predicting temperature profiles in mass concrete , 2004 .

[8]  P. Léger,et al.  Hydrostatic, Temperature, Time-Displacement Model for Concrete Dams , 2007 .

[9]  Yu Hu,et al.  Thermal analysis of mass concrete embedded with double-layer staggered heterogeneous cooling water pipes , 2012 .

[10]  J. Palyvos.  A survey of wind convection coefficient correlations for building envelope energy systems’ modeling , 2008 .

[11]  S. T. Hsu,et al.  Engineering heat transfer , 1963 .

[12]  Pierre Léger,et al.  Seasonal Thermal Displacements of Gravity Dams Located in Northern Regions , 2009 .

[13]  Abdallah I. Husein Malkawi,et al.  Thermal-Structural Modeling and Temperature Control of Roller Compacted Concrete Gravity Dam , 2003 .

[14]  Jin-Keun Kim,et al.  Experimental study on the convective heat transfer coefficient of early-age concrete , 2009 .

[15]  Yong Wu,et al.  Simulation of Temperature and Stress Fields during RCC Dam Construction , 2000 .

[16]  Miguel Cervera,et al.  Simulation of Construction of RCC Dams. I: Temperature and Aging , 2000 .

[17]  Yang Jian.  Simulation of the temperature field in mass concrete with double layers of cooling pipes during construction , 2012 .

[18]  Mohd Saleh Jaafar,et al.  Thermal and stress analysis of Kinta RCC dam , 2006 .

[19]  Yong Wu,et al.  Numerical implementation of temperature and creep in mass concrete , 2001 .

[20]  G. F Jones,et al.  Steady-state heat transfer in an insulated, reinforced concrete wall: theory, numerical simulations, and experiments , 1999 .

[21]  Y. Çengel.  Heat and Mass Transfer: A Practical Approach , 2006 .

[22]  Mohd Saleh Jaafar,et al.  Three Dimensional Nonlinear Temperature and Structural Analysis of Roller compacted Concrete Dam , 2009 .

[23]  Hui Li,et al.  Effect of superficial insulation on roller-compacted concrete dams in cold regions , 2011, Adv. Eng. Softw..

[24]  Yaolong Chen,et al.  Simulation analysis of thermal stress of RCC dams using 3-D finite element relocating mesh method , 2001 .

[25]  A. T. Young,et al.  Revised optical air mass tables and approximation formula. , 1989, Applied optics.

[26]  Olivier Coussy,et al.  What is a massive concrete structure at early ages? Some dimensional arguments , 2001 .

[27]  Zhu Bo-fang,et al.  Compound exponential formula for variation of thermal and mechanical properties with age of concrete , 2011 .

[28]  M. Iqbal.  An introduction to solar radiation , 1983 .