Numerical Simulation Analysis on Mass Concrete Thermal Stress

2012 ◽  
Vol 204-208 ◽  
pp. 4396-4399 ◽  
Author(s):  
Guo Liang Tian ◽  
Yin Wang
Keyword(s):  
Numerical Simulation ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Thermal Stress ◽  
Large Scale ◽  
Simulation Analysis ◽  
Hydration Heat ◽  
Mass Concrete ◽  
Concrete Construction ◽  
Element Analysis

Cement hydration heat temperature of the concrete could result thermal stress. Which is an important reason for the concrete structure’ cracks. The cracks could reduce the structure’ durability and structural stability. A spatial finite element model analysis on a mass concrete foundation board of a project was established using large-scale finite element analysis software. Temperature stress finite element analysis was carried on model. Numerical simulation analyzed the hydration heat of mass concrete construction phase and calculated the mass concrete’ temperature and stress distribution. Results of numerical simulation of crack control had certain guiding significance to mass concrete construction.

Numerical Simulation Analysis in Cooling Temperature Field and Bending Deformation after Rolling of 100-Meter Rail

2011 ◽  
Vol 121-126 ◽  
pp. 4523-4527
Author(s):  
Yu Yan Liu ◽  
Yan Wang ◽  
Lin Chen ◽  
Ge Li ◽  
Jian Guo Wang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Large Scale ◽  
Simulation Analysis ◽  
Analysis Model ◽  
Cooling Process ◽  
Element Analysis ◽  
Stress Variation ◽  
Finite Element Analysis Model ◽  
Bending Deformation

The paper established U75V 100-meter rail 3-D transient non-liner finite element analysis model about U75V 100-meter rail by using the large-scale non-liner finite element analysis software ABAQUS. By analyzing the different positions in the section of the temperature variation, the changes of bending degree and the residual stress variation after the bending deformation have changed. Based on the 100-meter straight rail in natural cooling under the cooling process, simulation results showed that in the cooling process, deflection change with time mainly divided into four stages; In consideration of the friction effect, the flat rail cold curve for its deformation among roughly flat, the curve about either ends, the scope for bending is 18 meters, the maximal displacement is 1.88 meters while the flat rail occured end colding.

Finite Element Analysis on the Directly Buried Heating Bent Pipeline with Many Break Angles

2013 ◽  
Vol 842 ◽  
pp. 415-419
Author(s):  
Bao Xian Qian ◽  
Fei Wang ◽  
Guo Wei Wang
Keyword(s):  
Numerical Simulation ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Simulation Analysis ◽  
Design Method ◽  
Engineering Practice ◽  
Analysis Method ◽  
Element Analysis ◽  
Current Design ◽  
Practical Engineering

In order to get the optimal design scheme of a directly buried heating bent pipeline with many fold angles in a certain practical engineering, this paper simulated the pipeline by the ANSYS finite element analysis software.Through applying different boundary conditions to the model, the stress was analyzed, the destroy forms of the pipeline and the positions of stress danger points were determined,and the fatigue life was checked according to BS EN. Compared with the current design method,adopting numerical simulation analysis method has greatly reduced the number of the usage of compensators and fixed piers, broke through the restrictions for larger fold angle in the standard,and at the same time, it has reduced the construction difficulties and the engineering investment,improved the reliability of the network,this paper has guiding significance to the engineering practice.

Simulation Analysis and Process Control of an Arch Bridge for Replacement of Tie Bars

2011 ◽  
Vol 90-93 ◽  
pp. 1720-1725
Author(s):  
Si Tian Chen ◽  
Ting Ting Yang ◽  
Li Qun Wu
Keyword(s):  
Numerical Simulation ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Simulation Analysis ◽  
Steel Tube ◽  
Nonlinear Finite Element ◽  
Bridge Structure ◽  
Control Parameters ◽  
Analysis Software ◽  
Element Analysis

The numerical simulation analysis, by using senior nonlinear finite element analysis software MSC.Marc, was achieved in this paper for the tie-replacing procedures of a steel tube tied-arch filled with concrete. Through this analysis, the control parameters were accurately determined for the installing of new ties and the removing of old ties. Results of numerical analysis ensured the bridge structure stable during the replacement, made the construction of safe and convenient, and played a guiding role in the maintenance and reinforcement. The successful experience could be referenced by other similar projects.

Thermal Stress Numerical Simulation on Concrete Hydration Heat of Giant Floor in Deep Foundation Pit

2012 ◽  
Vol 535-537 ◽  
pp. 1961-1964 ◽  
Author(s):  
Guang Dong Han ◽  
Chang Sheng Guan ◽  
Ji Cheng
Keyword(s):  
Numerical Simulation ◽  
Thermal Stress ◽  
Simulation Analysis ◽  
Mass Concrete ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Element Analysis ◽  
Concrete Core ◽  
Temperature Changes ◽  
Deep Foundation Pit

The finite element analysis software, during the pouring of concrete for the temperature field and stress field in a numerical simulation analysis. Analysis showed that the concrete core temperature changes greater maximum thermal stress in mass concrete bottom and around the site and soil transfer, far less than the concrete tensile stress, the temperature will not crack.

Research on Crack of Cylinder Bracket Based on Numerical Simulation and Finite Element Analysis

2014 ◽  
Vol 940 ◽  
pp. 236-240
Author(s):  
Hong Fei Luo ◽  
Jian Cheng Wang ◽  
Jie Lei ◽  
Qing Bin Cui
Keyword(s):  
Numerical Simulation ◽  
Finite Element Analysis ◽  
Finite Element ◽  
High Speed ◽  
Simulation Analysis ◽  
Dynamics Simulation ◽  
Element Analysis ◽  
Gas Source ◽  
Simulation Based ◽  
Type Test

During type test experiment of loading mechanism, there exist a problem of deformation and cracking, in order to solve this problem, movement of cylinder under the action of gas source is analyzed by numerical simulation, based on this, use finite element analysis to execute dynamics simulation analysis, the effect of high-speed collisions when loading mechanism work it bring to cylinder bracket is analyzed, and the reason of cylinder bracket crack is find out. The modify method is put forward, it is proved by experiment that, after modify, the working reliability is significantly improved.

Finite Element Analysis of Mass Concrete Temperature Crack Mechanism

2012 ◽  
Vol 594-597 ◽  
pp. 713-716
Author(s):  
Zhi Hua Xu ◽  
Da Wei Sun ◽  
Hai Xiao
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Temperature Stress ◽  
Concrete Structure ◽  
Large Scale ◽  
Mass Concrete ◽  
Continuous Development ◽  
Element Analysis ◽  
Concrete Temperature ◽  
Temperature Crack

With the large-scale continuous development of economic, mass concrete structure plays an important role in the architecture construction field. This paper simulates the mechanism of temperature crack which is caused by temperature stress due to the change of temperature, introduces the generative principle of temperature crack simply and could provide references for control the temperature crack effectively.

Three-Dimensional Finite Element Analysis of Dynamic Response of the Stress in Pavement Structure under Overload

2013 ◽  
Vol 671-674 ◽  
pp. 1267-1271
Author(s):  
Bao Shi Wang ◽  
Jun Qing Liu ◽  
Peng Fei Pang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Large Scale ◽  
Simulation Analysis ◽  
Moving Load ◽  
Three Dimensional ◽  
Three Dimension ◽  
Element Analysis ◽  
Remarkable Effect ◽  
Pavement Structure

In recent years, the phenomenon of vehicle overload in highway transportation is more and more serious. The three-dimensional dynamic FEM was adopted and a three-dimensional simulative model for asphalt pavement with subgrade based on cross-anisotropy under moving load was established by the large-scale finite element analysis software ABAQUS. The response of the stress in the pavement structure was got by using ABAQUS/Standard code. During deceleration, The simulation analysis results under the rated load were compared with those under the different overload ratio. The results show that, under moving load, the surface course of pavement is mainly in three dimension compressive stress state. The horizontal load caused by deceleration has a remarkable effect on the longitudinal stress and the horizontal shearing stress. The stress of the pavement structure under overload is much greater than that caused by the rated load. And the greater the overload ratio, the greater the deviation between them.

Finite Element Analysis of Z-Shaped Pipe in the Directly Buried Heat-Supply Pipeline with Large Diameter

2014 ◽  
Vol 721 ◽  
pp. 96-99
Author(s):  
Ming Qiang Li ◽  
Fei Wang ◽  
Guo Wei Wang ◽  
Yong Gang Lei
Keyword(s):  
Numerical Simulation ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Boundary Conditions ◽  
Engineering Design ◽  
Heat Supply ◽  
Simulation Analysis ◽  
Large Diameter ◽  
Ansys Software ◽  
Element Analysis

In order to improve Z-shaped pipe in the directly buried heat-supply pipeline with large diameter stress calculations, guiding the engineering design when the short arm length is less than two times the elastic arms length. The author used ANSYS software to numerical simulation analysis on Z-shaped pipe in the directly buried heat-supply pipeline of DN800, DN1000, DN1200, when the long arm length of 50 m, 100 m, 150 m, and the short arm length from two times to one times of the elastic arm length. Applying boundary conditions in different models with the short arm length shortens the process to Z-shaped pipe of the elbow stress. For Z-shaped pipe in the directly buried heat-supply pipeline the short arm from two times to one times of the elastic arm length, the elbow’s stress value is the minimum when the short arm length is 1.2 times of the elastic arm length. This article breaks the specification limits on the short arm length, improving the flexibility of directly buried heat-supply pipeline with large diameter, reducing the difficulty of construction, and it’s important for guiding the actual project.

Three Turnaround Heat Treating Studies

2003 ◽  
Author(s):  
Jaan Taagepera ◽  
Marty Clift ◽  
D. Mike DeHart ◽  
Keneth Marden
Keyword(s):  
Heat Treatment ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Thermal Stress ◽  
Thermal Stresses ◽  
Heat Treating ◽  
Element Analysis ◽  
Stress Profiles ◽  
Insight Into

Three vessel modifications requiring heat treatment were analyzed prior to and during a planned turnaround at a refinery. One was a thick nozzle that required weld build up. This nozzle had been in hydrogen service and required bake-out to reduce the potential for cracking during the weld build up. Finite element analysis was used to study the thermal stresses involved in the bake-out. Another heat treatment studied was a PWHT of a nozzle replacement. The heat treatment band and temperature were varied with location in order to minimize cost and reduction in remaining strength of the vessel. Again, FEA was used to provide insight into the thermal stress profiles during heat treatment. The fmal heat treatment study was for inserting a new nozzle in a 1-1/4Cr-1/2Mo reactor. While this material would ordinarily require PWHT, the alteration was proposed to be installed without PWHT. Though accepted by the Jurisdiction, this nozzle installation was ultimately cancelled.

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