scholarly journals The thermal stress of roller-compacted concrete dams during construction

2018 ◽  
Vol 196 ◽  
pp. 04059 ◽  
Author(s):  
Nikolay Aniskin ◽  
Chuc Nguyen Trong
Keyword(s):  
Thermal Stress ◽  
Temperature Regime ◽  
The Body ◽  
Experiment Planning ◽  
Concrete Dams ◽  
Concrete Dam ◽  
Roller Compacted Concrete ◽  
Significant Temperature ◽  
Maximum Temperatures ◽  
Under Construction

During the construction of concrete dams from rolled-compacted concrete, the main effect on the structure are the temperature effects. As a result of heat generation during hydration of cement and the influence of many other factors, significant temperature gradients and cracks may occur. In this paper, the optimal maximum temperatures arising in the body of the concrete dam under construction are determined by the method of experiment planning and the method of numerical simulation - the finite element method. The analysis of the influence of the acting factors on the temperature regime and the thermal stressed state at the rock-built concrete dam from rolled concrete is carried out. The dependences are obtained and nomograms are constructed to determine the optimal parameters. With the help of the computer program Midas Civil 2011, calculations of the temperature regime of the constructed dam were carried out and the maximum temperatures were determined. The calculations of thermal stress state of the structure along with an analysis of the possible cracking are conducted.

scholarly journals INVESTIGATING THE EFFECT OF LONGITUDINAL GALLERY ON DYNAMICAL RESPONSE OF GRAVITY CONCRETE DAMS USING FEM

2021 ◽  
Vol 56 (4) ◽  
pp. 804-811
Author(s):  
Amir Reza Eskenati ◽  
Amir Mahboob ◽  
Amir Alirezaie ◽  
Reyhaneh Askari ◽  
S.M.S. Kolbadi
Keyword(s):  
The Body ◽  
Stress And Strain ◽  
Dynamical Response ◽  
Concrete Dams ◽  
Concrete Dam ◽  
Large Size ◽  
Different Dimensions ◽  
Dam Stability ◽  
Safety And Stability ◽  
Strain Responses

This research aimed to consider the necessity of studying different dimensions of existing galleries in gravity concreted dams regarding design limitations and the dam sustainability provision. In recent years, structural optimization has been studied extensively with various considerations. Concrete volume in concrete dams is higher than in other concrete dams. Therefore, if the concrete volume of these dams can be reduced without reducing the dam safety and stability, the costs of constructing such dams could be significantly reduced. For this purpose, in this paper, the Pine Flat Gravity Dam has been selected, its numerical model has been constructed and stimulated under the Taft earthquake. There are three types of small, medium, and large size galleries in different positions. The dam reservoir and foundation in the current study have been modeled, and the foundation has been assumed to have no mass. Then the results have been examined. The innovation of this research is in identifying the most optimal shape and position of the gallery in the body of the weighted concrete dam, which is based on stress and strain responses. It can be concluded that while the medium gallery was in the middle of the dam, the optimum condition for reducing concrete was achieved by maintaining the dam stability.

Simulation of thermal stress and control measures for rock-filled concrete dam in high-altitude and cold regions

2021 ◽  
Vol 230 ◽  
pp. 111721
Author(s):  
Yuxiang Zhang ◽  
Jianwen Pan ◽  
Xinjian Sun ◽  
Jijun Feng ◽  
Dengqiang Sheng ◽  
...  
Keyword(s):  
Thermal Stress ◽  
High Altitude ◽  
Control Measures ◽  
Concrete Dam ◽  
Cold Regions ◽  
And Control

Study on Thermal Analysis of the Shape of Improved Electric Cooker Liner Based on ANSYS Workbench

2014 ◽  
Vol 487 ◽  
pp. 568-571
Author(s):  
Yan Li Su ◽  
Lei Li ◽  
Wei Guo Han
Keyword(s):  
Thermal Analysis ◽  
Thermal Stress ◽  
Stress Analysis ◽  
Thermal Effects ◽  
The Body ◽  
Total Deformation ◽  
Ansys Workbench

In this paper, a comparative thermal analysis is carried out according to the bottom of HR-FD51 electric cooker liner about a large or small fillet. And then the thermal analysis results are applied to stress analysis as the body loads. The results show that it can reduce thermal stress and total deformation with a large fillet, thereby, improves the lifespan of electric cooker liner and thermal effects as well.

scholarly journals Development of Simulation Program for Temperature Field of Mass Concrete Structures

2018 ◽  
Vol 38 ◽  
pp. 03020 ◽  
Author(s):  
Zheng Si ◽  
Qian Zhang ◽  
Ling Zhi Huang ◽  
Dan Yang
Keyword(s):  
Temperature Field ◽  
Concrete Structure ◽  
Relative Difference ◽  
Maximum Temperature ◽  
Mass Concrete ◽  
Field Calculation ◽  
Concrete Dam ◽  
Roller Compacted Concrete ◽  
Roller Compacted Concrete Dam ◽  
The Difference

Most existing temperature field calculation programs have relative defects. In the present paper, based on merits of ANSYS platform, a temperature field calculation program of mass concrete structure is developed and demonstrated. According to actual pouring progress and thermodynamic parameters, a roller-compacted concrete dam is simulated. The difference of maximum temperature between calculated and measured values of measuring points is less than 1.8°C. Furthermore, the relative difference is -5%–5%. This result shows that the calculation program developed based on ANSYS platform can simulate and calculate the temperature field of mass concrete structure.

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