Analysis of High Concrete Arch Dam Thermal-Creep-Stress

2011 ◽  
Vol 243-249 ◽  
pp. 4496-4500 ◽  
Author(s):  
Ke Hong Zheng ◽  
Bing Yin Zheng
Keyword(s):  
Thermal Stress ◽  
Thermal Stresses ◽  
Simulation Analysis ◽  
Great Influence ◽  
Arch Dam ◽  
Thermal Creep ◽  
High Arch Dam ◽  
Finite Element Program ◽  
Concrete Arch Dam ◽  
Creep Stress

The calculation of thermal stress is important to high concrete arch dam. In the progress of construction simulation analysis, the distribution of thermal stresses should be paid attention for it has great influence to arch design and rapid construction. The impacts on thermal stress are water temperature and air temperature and so on. In this paper, the author also thought about of the influence of creep, and applied the formulations of predecessors to finite element program. A engineering example about some high arch dam proves correctness and feasibility of considering thermal-creep –stress.

Research on Autogenous Volume Deformation’s Influence on Thermal Creep Stress of Concrete High Arch Dam

2011 ◽  
Vol 282-283 ◽  
pp. 367-370 ◽  
Author(s):  
Ling Fei Xie ◽  
Li Yang
Keyword(s):  
Sensitivity Analysis ◽  
Temperature Field ◽  
Thermal Stress ◽  
Arch Dam ◽  
Thermal Creep ◽  
Residual Thermal Stress ◽  
Volume Deformation ◽  
High Arch Dam ◽  
Creep Stress ◽  
Expansion Period

Autogenous volume deformation is an important parameter of anti-cracking behaviors of concrete. The sensitivity analysis of influence of concrete autogenous volume deformation on thermal stress of Xiaowan high arch dam is carried out based on simulation of temperature field. When presuming autogenous volume deformation, expansion concrete and shrinkage concrete are considered. The results show that early expansion and early shrinkage concretes have obvious influence on arch dam’s early thermal st ress; however have less influence on dam center’s maximum thermal stress. The longer of expansion period, the smaller of dam center’s maximum thermal stress; and the final residual thermal stress, which can benefit the concrete’s anti-cracking quality.

Genetic Analysis of Concrete Crack in Hydroelectric Station's Plant Based on FEM

2007 ◽  
Vol 340-341 ◽  
pp. 1163-1168
Author(s):  
Shu Ping Huang ◽  
Xuan Mao Peng ◽  
Qi Ling ◽  
Yi Hua Dai ◽  
Cheng Peng Du
Keyword(s):  
Thermal Stress ◽  
Genetic Analysis ◽  
Hydroelectric Station ◽  
Thermal Creep ◽  
Three Dimension ◽  
Construction Period ◽  
Creep Stress ◽  
Concrete Crack ◽  
Mechanics Performance ◽  
Operation Period

This study is mainly in temperature-control and anti-cracking of plant concrete in hydroelectric station. By means of FEM of three-dimension thermal creep stress and imitating construction progress, an emulator calculation is performed from construction period to operation period and distribution regularity of thermal creep stress is brought to light in the theory. The text described the developing process of concrete’s temperature and thermal stress, and then combined concrete’s time-varied thermotics and mechanics performance to analyze the possibility of yielding crack in different period and position.

Numerical Investigation of High Speed Combustion and its Impact on Thermal Structure

2014 ◽  
Author(s):  
Litao Zhang ◽  
Lili Zheng ◽  
Lingyun Hou
Keyword(s):  
Heat Flux ◽  
Thermal Stress ◽  
High Speed ◽  
Thermal Stresses ◽  
Numerical Study ◽  
Thermal Structure ◽  
Great Influence ◽  
Leading Edge ◽  
Reacting Flow ◽  
Fuel Flow

This paper presents numerical study of high-speed combustion and its relationship with thermal stress distribution on a cavity combustion chamber. First, a physical model is established to describe high speed compressible turbulent reacting flow as well as thermal transport in combustor structure. It is then applied to a model combustor with two-staged fuel injections to examine the effects of fuel flow rate and inflow conditions on the heat flux intensity and thermal stress distributions across the thickness of the combustor wall. The result shows that the injection method of the first stage has a great influence on the flow field near the second one, and it affects combustion and heat release distribution inside the combustor. The intensity of heat flux passing through the combustor wall changes along the downstream of the flow, and large thermal stresses are generated in the vicinity of the injector, the leading edge and the trailing edge of the cavity.

scholarly journals A Real-Time Temperature Data Transmission Approach for Intelligent Cooling Control of Mass Concrete

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Peng Lin ◽  
Qingbin Li ◽  
Pinyu Jia
Keyword(s):  
Control System ◽  
Real Time ◽  
Data Transmission ◽  
Thermal Stresses ◽  
Temperature Data ◽  
Arch Dam ◽  
Solution Technique ◽  
Mass Concrete ◽  
High Arch Dam ◽  
Cooling Control

The primary aim of the study presented in this paper is to propose a real-time temperature data transmission approach for intelligent cooling control of mass concrete. A mathematical description of a digital temperature control model is introduced in detail. Based on pipe mounted and electrically linked temperature sensors, together with postdata handling hardware and software, a stable, real-time, highly effective temperature data transmission solution technique is developed and utilized within the intelligent mass concrete cooling control system. Once the user has issued the relevant command, the proposed programmable logic controllers (PLC) code performs all necessary steps without further interaction. The code can control the hardware, obtain, read, and perform calculations, and display the data accurately. Hardening concrete is an aggregate of complex physicochemical processes including the liberation of heat. The proposed control system prevented unwanted structural change within the massive concrete blocks caused by these exothermic processes based on an application case study analysis. In conclusion, the proposed temperature data transmission approach has proved very useful for the temperature monitoring of a high arch dam and is able to control thermal stresses in mass concrete for similar projects involving mass concrete.

Key Technical Issues and Optimization Analysis on Temperature Control and Crack Prevention Measures for Xiluodu Super-High Arch Dam during the Construction Period

2014 ◽  
Vol 584-586 ◽  
pp. 2043-2051
Author(s):  
You Zhi Liu ◽  
Guo Xin Zhang ◽  
Ping Yang ◽  
Shao Wu Zhou
Keyword(s):  
Simulation Analysis ◽  
Arch Dam ◽  
Control Measures ◽  
Effective Control ◽  
Engineering Practice ◽  
Prevention Measures ◽  
High Arch Dam ◽  
Safety Control ◽  
Construction Period ◽  
Transverse Joint

By utilizing the transverse joint opening and closing iteration technique and the finite element method based on the discontinuous deformation theory for manifolds, and with the help of measured data in situ of temperature, stress and displacement and so on during the construction period, the dynamic tracing feedback simulation/analysis was carried out to the temperature field and the stress field. On this basis, a series of effective safety control measures and methods were systematically put forward, which are beneficial to safety construction in the high temperature season and winter, improvement of the safety coefficient for restrained zones, lowering the cracking risk of low gradation concrete in portholes, ensuring the transverse joints aperture and groutability as well as effective control of the cantilever height and so on; and good effects have been obtained in the engineering practice and the important guarantee may be provided for the overall safety of Xiluodu Super-high arch dam.

FEM Simulation of Temperature and Thermal Stress of Xiaowan Arch Dam

2012 ◽  
Vol 212-213 ◽  
pp. 887-890 ◽  
Author(s):  
Xing Ping Yang ◽  
Xiao Lin Chang ◽  
Xing Hong Liu
Keyword(s):  
Thermal Stress ◽  
Fem Simulation ◽  
Arch Dam ◽  
Three Dimension ◽  
Construction Process ◽  
Thermal And Mechanical Properties ◽  
High Arch Dam ◽  
Reservoir Impounding ◽  
General Law ◽  
Environment Temperature

Taking all the effects into account of thermal and mechanical properties, construction process, environment temperature, arch-closure and reservoir impounding orders, three dimension (3D) finite element methods(FEM) was adopted to simulate the whole construction process for temperature changing and thermal stress distribution of the dam. Typically, the results of the highest 22nd monolith were analyzed, from which the general law for both temperature field and thermal stress was acquired. And the results are valuable for temperature control of Xiaowan high arch dam.

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