A Study on PHC Pipe Pile Spur Dikes Three-Dimensional Finite Element Numerical Modeling in the Lower of Yellow River

2011 ◽  
Vol 243-249 ◽  
pp. 4670-4674
Author(s):  
Zhong Fu Wang ◽  
Min Zhou ◽  
Bao Shen Zhang
Keyword(s):  
Finite Element ◽  
Numerical Modeling ◽  
Yellow River ◽  
Three Dimensional ◽  
Structure Design ◽  
Spur Dike ◽  
Pipe Pile ◽  
Dimensional Finite Element ◽  
Spur Dikes ◽  
Three Dimensional Finite Element

Based on the analyses of the traditional rockfill groins of spur dikes，the PHC pipe pile groin is presented.The functions of the riverwall protection function, anti-erosion performance, and structure design of the groin were analyzed. By the three-dimensional finite element numerical modeling, when the scour depth of spur dike is 20m, the safty coefficient of spur dike is 1.21 and the maximum deformation is 1.3 centimeter. The studies are shown that the PHC pipe pile have high strength, stability and anti-erosion performance; The deign of double-row pile is applied to the head of spur dike where the displacement is maximum and improves stress boundary condition of the spur dike and improves the whole stability effectively.

scholarly journals Effect of Deficiencies in the Tunnel Crown Thickness on Pressure Tunnels with Posttensioned Concrete Linings

2018 ◽  
Vol 2018 ◽  
pp. 1-14 ◽  
Author(s):  
Gan Qin ◽  
Shengrong Cao ◽  
Fan Yang
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Yellow River ◽  
Three Dimensional ◽  
Element Model ◽  
Concrete Lining ◽  
The Yellow River ◽  
Posttensioned Concrete ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element

This paper investigates the effect of deficiencies in the tunnel crown thickness on pressure tunnels with the posttensioned concrete lining. Based on the lining parameters of the Yellow River Crossing Tunnel, the modeling approach of the posttensioned concrete lining is introduced in detail and a three-dimensional finite element model is established. The three-dimensional finite element model is validated by experimental results from the full-scale model experiment of the Yellow River Crossing Tunnel. Special attention is given to the changes in the deformation, radial displacement, and circumferential stress of the posttensioned concrete lining with gradual decreases in the tunnel crown thickness. The calculation results show that the influence scopes of deficiencies in the tunnel crown thickness are mainly concentrated in the crown and its adjacent parts. The posttensioned concrete lining can still maintain a satisfactory stress state when deficiencies in the tunnel crown thickness exist, and undesirable stress levels may be caused only when the tunnel crown thickness decreases below a certain threshold. Furthermore, cracks are most likely to occur at the external and internal surfaces of the crown and at the internal surface of the crown’s adjacent parts, which is useful for taking measurements regarding the lining tightness and stability.

Finite Element Simulation of Ultrasound Propagation in Trabecular Bone

2013 ◽  
Author(s):  
Behzad Vafaeian ◽  
Yuchin Wu ◽  
Michael R. Doschak ◽  
Marwan El-Rich ◽  
Tarek El-Bialy ◽  
...  
Keyword(s):  
Finite Element ◽  
Numerical Modeling ◽  
Wave Propagation ◽  
Trabecular Bone ◽  
Quantitative Ultrasound ◽  
Three Dimensional ◽  
Osteoporotic Bone ◽  
Ultrasound Propagation ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element

Quantitative ultrasound is used to identify healthy versus osteoporotic bone. However the physics of ultrasound propagation in trabecular media is still not sufficiently understood. This lack of understanding is reported to be an obstacle in further development of this bone assessment technique. Numerical models of wave propagation stand as a potentially successful tool to explain the various experimental observations. The main issue in the numerical modeling of wave propagation in trabecular bone is the complex geometry of the trabecular structures surrounded by a fluid (bone marrow). So far, the complex geometrical domain of trabecular structures has been approximated by finite difference grids for wave propagation analyses. In this work, numerical simulation of ultrasound propagation into trabecular bone sample is performed using the finite element method (FEM). A new procedure for numerical modeling of trabecular bone tailored for the FEM is introduced. The entire complex trabecular geometries of two cubic bone samples are reconstructed using computed microtomography data. For the first time a three dimensional finite element mesh using tetrahedral elements is generated for the two-phase medium of a trabecular bone. Separate meshes for the bony part and the filling marrow (considered as non-viscous water) are generated and acoustic-structure interaction condition is imposed on their interface. It is shown that the three-dimensional simulation using the FEM can predict ultrasound propagation phenomena observed in experiments: linear dependency of attenuation on frequency, the effect of bone volume on the attenuation and speed of sound, and the propagation of fast and slow waves. Moreover, the broadband ultrasound attenuation (BUA) for two ultrasonic signals propagating into a healthy and an osteoporotic sample are compared. A distinguishable difference in BUA between the two samples is observed expressing lower BUA for osteoporotic bone. Our developed model is the first three-dimensional finite element analysis model to compare the ultrasound propagation in healthy versus osteoporotic bone. The developed model can be further utilized as a tool to explain various experimental observations of quantitative ultrasound of bone.

Mechanical Characteristic Analysis of Dredger Crane Based on ABAQUS

2013 ◽  
Vol 821-822 ◽  
pp. 1406-1409
Author(s):  
Jian Bo Wang ◽  
Xun Qian Xu ◽  
Yong Zhu
Keyword(s):  
Finite Element ◽  
Theoretical Calculations ◽  
Reaction Force ◽  
Three Dimensional ◽  
Structure Design ◽  
Stress Concentrations ◽  
Characteristic Analysis ◽  
Design And Optimization ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element

In order to improve the safety and stability of dredger crane (DC), three dimensional finite element models for the DC were established. By applied loads and boundary conditions, the area of stress concentrations, the axis force of jib cylinder and the reaction force of the king structure was obtained under four typical working conditions. Meanwhile, the related theoretical calculations were accomplished to comparing finite element results and at last some suggestions were given. The conclusions can provide a theoretical reference for the further structure design and optimization of DC.

Three-Dimensional Finite Element Modeling and Front Crash Process Analysis of Car Bodywork

2010 ◽  
Vol 44-47 ◽  
pp. 920-923
Author(s):  
Li Xin Guo ◽  
Jie Gong ◽  
Jin Li Li
Keyword(s):  
Finite Element ◽  
Traffic Accidents ◽  
Process Analysis ◽  
Three Dimensional ◽  
Element Model ◽  
Economic Loss ◽  
Structure Design ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element ◽  
Front Crash

Traffic accidents cause to a large quantity of personnel casualty and economic loss every year. The safety in vehicle crash has been one of important criterions in vehicle design. In this study a three-dimensional finite element model was established and the front crash process of car bodywork was analyzed. The simulation results show that the structure design of car bodywork is reasonable and of safety for the passengers. The investigation of this study not only validates the rationality of the car bodywork design but also provides a detailed numerical simulation model for further investigation as well as improvement and optimization of the car bodywork structure.

Finite Element Analysis of Nonuniformity of Tires with Imperfections5

2007 ◽  
Vol 35 (3) ◽  
pp. 226-238 ◽  
Author(s):  
K. M. Jeong ◽  
K. W. Kim ◽  
H. G. Beom ◽  
J. U. Park
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Three Dimensional ◽  
Element Model ◽  
Radial Force ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Dimensional Finite Element ◽  
Force Variation ◽  
Three Dimensional Finite Element

Abstract The effects of variations in stiffness and geometry on the nonuniformity of tires are investigated by using the finite element analysis. In order to evaluate tire uniformity, a three-dimensional finite element model of the tire with imperfections is developed. This paper considers how imperfections, such as variations in stiffness or geometry and run-out, contribute to detrimental effects on tire nonuniformity. It is found that the radial force variation of a tire with imperfections depends strongly on the geometrical variations of the tire.

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