The Temperature Control Simulation on Concrete Dam Simulation Analysis of the Concrete Block in First-Stage Water Cooling

2012 ◽  
Vol 462 ◽  
pp. 402-406
Author(s):  
Ying Bin Kang ◽  
Hui Xia Bian
Keyword(s):  
Temperature Field ◽  
Temperature Control ◽  
Simulation Analysis ◽  
Control Measure ◽  
Cooling Water ◽  
Concrete Block ◽  
Water Cooling ◽  
Concrete Dam ◽  
Cooling Pipe ◽  
Concrete Temperature

Control the concrete temperature to reduce the temperature cracks is one of the main tasks in the concrete dam construction. Water cooling is the most effective temperature control measure of concrete dam. In connection with the concrete temperature field of cooled computational problems, according to the water and heat exchange between the concrete and cooling water pipes, The cooling pipe is considered as the effect source of heat, and the effect of the water cooling is considered on average meaning, and then the approximate temperature field can be obtained through the finite element.

Temperature Control of RCC Dam in Yongding Project

2012 ◽  
Vol 238 ◽  
pp. 272-277
Author(s):  
Xiang Dong Xu ◽  
Jin Chao Yue
Keyword(s):  
Temperature Control ◽  
Cooling Water ◽  
Practical Method ◽  
Gravity Dam ◽  
Counter Measures ◽  
Water Pipes ◽  
Rcc Dam ◽  
Key Points ◽  
Concrete Temperature ◽  
Key Factor

Yongding RCC gravity dam with large project scale is in the construction all over the year, and the big temperature stress is a key factor for construction quality and progress. The temperature of the RCC dam in typical season with and without control conditions was analyzed by FEM, the temperature situation in typical season of RCC dam was controlled by the embedded cooling water pipes by practical method. Key points in concrete temperature control during high temperature season are found out, the counter measures and issues to be noticed are put forward.

The Analysis and Improvement of Inverse Problem Simulated Annealing Algorithm about Concrete Temperature Field

2013 ◽  
Vol 275-277 ◽  
pp. 2611-2615
Author(s):  
Lun Yan Wang ◽  
Lei Guo ◽  
Hui Min Yuan
Keyword(s):  
Inverse Problem ◽  
Temperature Field ◽  
Simulated Annealing ◽  
Temperature Control ◽  
Simulated Annealing Algorithm ◽  
Simulated Annealing Method ◽  
Factors Affecting ◽  
Concrete Temperature ◽  
Annealing Algorithm ◽  
Annealing Method

The thermodynamic parameters and boundary conditions is one of the important factors affecting the simulation precision of concrete temperature control, and through the test way obtaining these parameters demands high cost, and often works with practical mismatch. This paper introduces the simulated annealing method, analyse and improve the simulated annealing method . The results show that, the improved of simulated annealing algorithm can be used for the study of concrete temperature field inverse.

Numerical Simulation on Real-Time Temperature Field and Strength Field of Bridge Mass Concrete

2011 ◽  
Vol 99-100 ◽  
pp. 346-349
Author(s):  
Chun Mei Zhu ◽  
You Zhi Wang ◽  
Bin Yan ◽  
Hong Wei Gao
Keyword(s):  
Numerical Simulation ◽  
Temperature Field ◽  
Stress Field ◽  
Real Time ◽  
Simulation Analysis ◽  
Mass Concrete ◽  
Construction Scheme ◽  
Control Schemes ◽  
Concrete Temperature ◽  
Instantaneous Temperature

Access to the internal concrete temperature of the instantaneous temperature field and the strength of the field Real-time monitoring , Concrete temperature field and stress field of the numerical simulation analysis method was proposed . Intuitive accurate prediction that the temperature field and stress field provide a reliable basis on the distribution of temperature control schemes and the construction scheme formulated.

scholarly journals Temperature Control Technology for Construction of Jinsha River Bridge

2021 ◽  
Vol 2021 ◽  
pp. 1-14
Author(s):  
Hui-Wu Jin ◽  
Guo-An Wang ◽  
Zhan-Ming Chen
Keyword(s):  
Temperature Control ◽  
Temperature Difference ◽  
Cooling Water ◽  
Good Health ◽  
Large Mass ◽  
Maximum Temperature ◽  
Mass Concrete ◽  
Jinsha River ◽  
Mixture Ratio ◽  
Concrete Temperature

The key problem of mass concrete temperature control is to effectively control the maximum temperature inside concrete, the temperature difference between inside and outside concrete, and the temperature difference between surface and environment. The size of the main tower cap of No. 3 Jinsha River Bridge is 37 m × 23.5 m × 5.5 m, and the cubic volume of concrete reaches 4782.3 m3, which is poured in two times. In order to ensure construction quality of mass concrete structure, prevent the large mass concrete temperature stress, through the numerical simulation of the temperature control and optimization scheme, by optimizing the mixture ratio design, reducing the temperature of concrete pouring into the mold, cooling water cycling, insulation keeping in good health and a series of measures to effectively achieve the control goal, and eliminating the temperature cracks. The measured data show that the maximum temperature inside concrete, the temperature difference between inside and outside, and the temperature difference between surface and environment are qualified, but the temperature difference control of cooling water inlet and outlet has hysteresis effect, and the temperature difference between inlet and outlet will be greater than 10°C, which should be noticed.

scholarly journals Precise Simulation of Heat-Flow Coupling of Pipe Cooling in Mass Concrete

Materials ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5142
Author(s):  
Peng Yu ◽  
Ruiqing Li ◽  
Dapeng Bie ◽  
Xiancai Liu ◽  
Xiaomin Yao ◽  
...  
Keyword(s):  
Heat Flow ◽  
Temperature Gradient ◽  
Temperature Control ◽  
Cooling Water ◽  
Mass Concrete ◽  
Finite Element Software ◽  
Flow Coupling ◽  
Cooling Pipe ◽  
Cooling Effects ◽  
Precise Simulation

For a long time, temperature control and crack prevention of mass concrete is a difficult job in engineering. For temperature control and crack prevention, the most effective and common-used method is to embed cooling pipe in mass concrete. At present, there still exists some challenges in the precise simulation of pipe cooling in mass concrete, which is a complex heat-flow coupling problem. Numerical simulation is faced with the problem of over-simplification and inaccuracy. In this study, precise simulation of heat-flow coupling of pipe cooling in mass concrete is carried out based on finite element software COMSOL Multiphysics 5.4. Simulation results are comprehensively verified with results from theoretical solutions and equivalent algorithms, which prove the correctness and feasibility of precise simulation. Compared with an equivalent algorithm, precise simulation of pipe cooling in mass concrete can characterize the sharp temperature gradient around cooling pipe and the temperature rise of cooling water along pipeline more realistically. In addition, the cooling effects and local temperature gradient under different water flow (0.60 m3/h, 1.20 m3/h, and 1.80 m3/h) and water temperature (5 °C, 10 °C, and 15 °C) are comprehensively studied and related engineering suggestions are given.

Dynamic Simulation Analysis of Temperature Field and Thermal Stress of Concrete Gravity Dam during Construction Period

2011 ◽  
Vol 90-93 ◽  
pp. 2677-2681 ◽  
Author(s):  
Hai Bo Wang ◽  
Sheng Qiang ◽  
Xiao Sun ◽  
Rui Zheng
Keyword(s):  
Temperature Field ◽  
Thermal Stress ◽  
Stress Field ◽  
Dynamic Simulation ◽  
Temperature Control ◽  
Simulation Analysis ◽  
Water Diversion ◽  
Gravity Dam ◽  
Good Effect ◽  
Concrete Gravity Dam

The basic theory of temperature field and stress field of concrete and 3D FEM combining with cooling pipe discrete model and iteration method are used to carry out the dynamic simulation analysis of the temperature filed and stress field of a concrete gravity dam of South-to-North Water Diversion Project. The impacts on cracking mechanism of the surface insulation, internal cooling and environmental climate are considered in calculation. The change laws of temperature field and thermal stress with time and their distributions are analyzed, reasonable temperature control measures are put forward for reference. The results show that good effect of temperature control and cracking prevention is achieved, the proposed measures should have great reference significance to the similar concrete dam in future.

Temperature Measurement and Data Analysis of the Roller Compected Concrete Dam

2012 ◽  
Vol 212-213 ◽  
pp. 942-946
Author(s):  
Zhen Xian Xing ◽  
Lei Ni ◽  
Rong Jia Ma
Keyword(s):  
Temperature Field ◽  
High Temperature ◽  
Concrete Dam ◽  
Effective Measure ◽  
Downstream Side ◽  
Upstream Side ◽  
Rcc Dam ◽  
Concrete Temperature ◽  
Dam Operation ◽  
Dam Concrete

Prototype observation of the concrete dam is an important and effective measure to master the operating condition of dams. Analysis of changes of concrete temperature for dams is the basis of studying the safety of dam operation. By analyzing the raw monitoring data of temperature of a RCC dam, this paper researches the changing process of concrete temperature and internal concrete partitions temperature variation of dams. It also draws the temperature field of the dam concrete. The results show that the isothermals of downstream side parallel with the surface of the downstream dam, and the isothermals of upstream side intersect with the dam. Isothermals which are near to the dam’s surface are close. This suggests that temperature gradient there is large. There is a high temperature nucleus and two low temperature nucleuses in the temperature field of the dam in summer, while in winter there is only one high temperature nucleus. So it suggests that the temperature field in summer is more complex.

A New Method for Improving the Stress Status of the Dam

2013 ◽  
Vol 444-445 ◽  
pp. 849-853
Author(s):  
Jian Hua Cui ◽  
Yong Feng Qi ◽  
Jie Su
Keyword(s):  
Temperature Control ◽  
Cooling Water ◽  
Control Measures ◽  
Sensitivity Analyses ◽  
Mass Concrete ◽  
Water Cooling ◽  
Concrete Gravity Dam ◽  
3D Fem ◽  
Construction Period ◽  
Operation Period

Under the action of annual change and sudden drop of air temperature, thermal induced cracking will occur in concrete dam during the operation period. For exploring the temperature control measures for crack prevention, taking a concrete gravity dam section as the research object, sensitivity analyses to the factors which affecting the water-cooling effect are conducted with 3D FEM, some significant suggestions for the water cooling are presented. The results show that, the stresses of the dam surface will decrease to a certain extent after water cooling in the operation period using the cooling water pipe which embedded during construction period, and the cracking risk of the dam will reduce. The study provides a new train of thought for the temperature control and crack prevention of the mass concrete during the operation period.

scholarly journals Simulation Analysis of Mass Concrete Temperature Field

2012 ◽  
Vol 5 ◽  
pp. 5-12 ◽  
Author(s):  
Zhou Yunchuan ◽  
Bai Liang ◽  
Yang Shengyuan ◽  
Chen Guting
Keyword(s):  
Temperature Field ◽  
Simulation Analysis ◽  
Mass Concrete ◽  
Concrete Temperature
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