Simulation Analysis of Concrete Temperature and Stress of Plant Elbow Section of Sluice Dam

In view of concrete structure of dam plant elbows section is complex and strong external constraints, the study of concrete temperature and stress during construction should be carried out by computer simulation. A case of plant elbow section of a sluice dam project is presented where the 3D FEM simulation of instability thermal field and stress field of the concrete structure is adopted after building the 3D finite element model, and the changes and distribution characteristics of temperature and stress during whole process of construction is obtained. The results show that, under the complex constraints condition, the concrete of plant elbow section has greater tensile stress, it can lead to structural cracking, and it is necessary to take appropriate temperature control measures.

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Simulation Analysis of Plain Sluice Concrete Temperature and Stress

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.438-439.583 ◽

2013 ◽

Vol 438-439 ◽

pp. 583-587

Author(s):

Kai Yun Yang ◽

Fei Guo ◽

Lin Hao Li

Keyword(s):

Temperature Control ◽

Concrete Structure ◽

Simulation Analysis ◽

Model Simulation ◽

Element Model ◽

Control Measures ◽

Construction Period ◽

Windy Weather ◽

Cracking Risk ◽

The Finite Element Model

For sluice concrete structure is more complex due to constrained by the base effect and upper structures, with the purpose of temperature control, we carry out the simulation analysis of temperature and stress during the construction of pier concrete structure. Taking a sluice project as an example, use the method developed by Thermo finite subspace model simulation procedures, the finite element model of pier structure is built with high precision. The results show that the cracking risk is relatively small and prone to surface cracks for baseplate; during construction period, much more attention should be payed to the high temperature difference between day and night, and to the insulation work at cold and windy weather; the key problem is that the middle pier which faces relatively great cracking risk, and necessary temperature control measures should be adopted.

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Temperature Control Measures Optimization of RCC Gravity Dam

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.226-228.1153 ◽

2012 ◽

Vol 226-228 ◽

pp. 1153-1156 ◽

Cited By ~ 1

Author(s):

Shu Ping Huang ◽

Jian Yun Fu ◽

Yan Cai Li

Keyword(s):

Temperature Control ◽

Simulation Analysis ◽

Control Measure ◽

Control Measures ◽

Gravity Dam ◽

Mass Concrete ◽

Dam Construction ◽

Construction Technology ◽

3D Fem ◽

Single Temperature

With the continuous development of dam construction technology, the RCC dam becomes one of the most popular types of dam in the world with its unique advantages. Temperature control measures research is one of the key issues of design and construction of mass concrete structures. How to choose the proper temperature control measures to prevent concrete cracks becomes the important problem of dam construction technology. In a RCC gravity dam, the climate environment is so severe that a single temperature control measure can’t meet the requirements of temperature control and crack prevention. In this paper, 3D FEM simulation analysis is used to calculate temperature field and thermal creep stress field during the whole construction process. According to the simulation results, the temperature control measures design of the dam has been comprehensively evaluated and the temperature control measures of this project have been put forward.

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The Whole Process Simulation and Research on Temperature Field and Thermal Stress for Large Sluice Pier

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.163-167.259 ◽

2010 ◽

Vol 163-167 ◽

pp. 259-263 ◽

Cited By ~ 1

Author(s):

Hai Bo Wang ◽

Sheng Qiang ◽

Zhen Yang Zhu ◽

Zhi Qiang Xie

Keyword(s):

Temperature Field ◽

Stress Field ◽

Control Measures ◽

Internal Cooling ◽

3D Fem ◽

Construction Period ◽

Whole Process ◽

Cooling Pipe ◽

Field Environment ◽

Temperature Filed

Based on the real construction process and field environment of large sluice pier for Caojie Project, considering the factors of surface insulation, internal cooling, the strength of the foundation and environmental climate, the basic theories 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 study of cracking mechanism. According to the 3D dynamic simulation of the temperature filed and stress field for the pier, reasonable temperature control measures are put forward for reference during construction period. The result of the simulation shows that the concept of the exterior thermal insulation and interior pipe cooling measures are of great useful in practice, and the methods should have great reference signification in future.

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Study on Optimization of Temperature Control Measures for Structure Concrete of Arc Dam

10.3233/atde210208 ◽

2021 ◽

Author(s):

Lei Zhang ◽

Xiaofang Ma ◽

Heng Zhao ◽

Lei Zheng ◽

Shouxun Ma

Keyword(s):

Phase I ◽

Temperature Stress ◽

Temperature Control ◽

Simulation Analysis ◽

Complex Structure ◽

Arch Dam ◽

Control Measures ◽

3D Fem ◽

Water Pipes ◽

Cooling Temperature

As the gate pier bracket of an arch dam are of complex structure which is characterized by use of high-grade concrete and more cement, higher adiabatic temperature rise, it is rather difficult to control temperature and vulnerable for cracking, and the cracks would absolutely affect the integrity, endurance and safety of pier gate bracket. It is necessary to take reasonable temperature control measures to reduce temperature stress during the construction and prevent cracking. This paper takes the gate pier bracket at the middle-hole dam section to perform simulation analysis of temperature field and stress field under different temperature control measures by 3D FEM. It proves that such measures as densifying water pipes, improving Phase I target cooling temperature appropriately, reducing Phase I cooling temperature falling variation and keeping insulation in low-temperature season can help reduce temperature stress and prevent cracking with good results.

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3D FEM Simulation Analysis for the Residual Stress to GTAW Welded Joints Based on Adscititious Magnetic Field

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.138-139.775 ◽

2011 ◽

Vol 138-139 ◽

pp. 775-779

Author(s):

Qi Lin Zhong ◽

Shu Yuan Jiang ◽

Huan Ming Chen ◽

Pin Liu

Keyword(s):

Magnetic Field ◽

Residual Stress ◽

Temperature Gradient ◽

Welded Joints ◽

Simulation Analysis ◽

Fem Simulation ◽

Welding Residual Stress ◽

3D Fem ◽

Welding Pool ◽

Longitudinal Residual Stress

Aiming at adscititious magnetic field effect GTAW arc, decrease the maximum welding residual which by arc shape be changed, avoid the temperature excessive focus on welding pool, reduce temperature gradient and so on. Arc heat source model of GTAW under the magnetic field was established, also consider physical properties of materials varying with the temperature and the influence transformation, through the method of killing or activating elements treatment such as melting or solidification by welding pool, 3D FEM simulation analysis for the temperature gradient and residual stress size distribution to GTAW welded joints compared to on magnetic field or not. The results show that maximum weld longitudinal residual stress and transverse residual stress were respectively reduced by 12.3% and 13.6% when compared to no magnetic field, also have blind hole measuring method measure welding residual stress, Test measurement and simulation values were basically consistent.

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3D FEM Simulation Analysis for PBL Shear Connectors

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.170-173.3449 ◽

2012 ◽

Vol 170-173 ◽

pp. 3449-3453 ◽

Cited By ~ 1

Author(s):

Zhang Liang Yu ◽

Bing Zhu ◽

Sheng Tan Dou ◽

Wen Xiu Liu

Keyword(s):

Bearing Capacity ◽

Simulation Analysis ◽

Failure Process ◽

Fem Simulation ◽

Ultimate Bearing Capacity ◽

3D Fem ◽

Element Analysis ◽

Shear Connectors ◽

Pull Out ◽

Steel Bar

This paper analyze ultimate bearing capacity, transfer mechanism, failure process and influence of aperture, steel bar diameter, concrete rating and on elastic bearing capacity and ultimate bearing capacity of PBL shear connectors by the finite element analysis software ANSYS. This paper can provide a reference for further design of PBL shear connectors as well as push-out or pull-out test. The results show that the elasticity bearing capacity of PBL shear connectors is determined primarily by concrete while the ultimate bearing capacity is determined primarily by perforative steel bar.

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3D FEM Simulation to Predict the Heat Affected Zone during Laser Machining on Stainless Steel 304

International Academy of Engineers (IA-E) April 24-25, 2015 Pattaya (Thailand) ◽

10.15242/iae.iae0415201 ◽

2015 ◽

Keyword(s):

Stainless Steel ◽

Heat Affected Zone ◽

Fem Simulation ◽

Laser Machining ◽

3D Fem ◽

Stainless Steel 304

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3D-FEM Simulation of Hot Rolling Process and Characterization of the Resultant Microstructure of a Light-Weight Mn Steel

Crystals ◽

10.3390/cryst11050569 ◽

2021 ◽

Vol 11 (5) ◽

pp. 569

Author(s):

Ana Claudia González-Castillo ◽

José de Jesús Cruz-Rivera ◽

Mitsuo Osvaldo Ramos-Azpeitia ◽

Pedro Garnica-González ◽

Carlos Gamaliel Garay-Reyes ◽

...

Keyword(s):

Hot Rolling ◽

Thermomechanical Processing ◽

Computational Simulation ◽

Effective Strain ◽

Fem Simulation ◽

Rolling Process ◽

3D Fem ◽

Hot Rolling Process ◽

Mn Steel

Computational simulation has become more important in the design of thermomechanical processing since it allows the optimization of associated parameters such as temperature, stresses, strains and phase transformations. This work presents the results of the three-dimensional Finite Element Method (FEM) simulation of the hot rolling process of a medium Mn steel using DEFORM-3D software. Temperature and effective strain distribution in the surface and center of the sheet were analyzed for different rolling passes; also the change in damage factor was evaluated. According to the hot rolling simulation results, experimental hot rolling parameters were established in order to obtain the desired microstructure avoiding the presence of ferrite precipitation during the process. The microstructural characterization of the hot rolled steel was carried out using optical microscopy (OM), scanning electron microscopy (SEM) and X-ray diffraction (XRD). It was found that the phases present in the steel after hot rolling are austenite and α′-martensite. Additionally, to understand the mechanical behavior, tensile tests were performed and concluded that this new steel can be catalogued in the third automotive generation.

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Analysis and prediction of the coronavirus disease epidemic in China based on an individual-based model

Scientific Reports ◽

10.1038/s41598-020-76969-4 ◽

2020 ◽

Vol 10 (1) ◽

Author(s):

Zuiyuan Guo ◽

Dan Xiao

Keyword(s):

Reproduction Number ◽

Control Measures ◽

Cumulative Number ◽

Individual Based Model ◽

Whole Process ◽

Coordinate Descent Algorithm ◽

Initial Stage ◽

The Government ◽

Prevention And Control Measures ◽

And Control

AbstractWe established a stochastic individual-based model and simulated the whole process of occurrence, development, and control of the coronavirus disease epidemic and the infectors and patients leaving Hubei Province before the traffic was closed in China. Additionally, the basic reproduction number (R0) and number of infectors and patients who left Hubei were estimated using the coordinate descent algorithm. The median R0 at the initial stage of the epidemic was 4.97 (95% confidence interval [CI] 4.82–5.17). Before the traffic lockdown was implemented in Hubei, 2000 (95% CI 1982–2030) infectors and patients had left Hubei and traveled throughout the country. The model estimated that if the government had taken prevention and control measures 1 day later, the cumulative number of laboratory-confirmed patients in the whole country would have increased by 32.1%. If the lockdown of Hubei was imposed 1 day in advance, the cumulative number of laboratory-confirmed patients in other provinces would have decreased by 7.7%. The stochastic model could fit the officially issued data well and simulate the evolution process of the epidemic. The intervention measurements nationwide have effectively curbed the human-to-human transmission of severe acute respiratory syndrome coronavirus 2.

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