The Numerical Analysis of Earth Pressure on Bucket Foundation Breakwater

2015 ◽  
Vol 744-746 ◽  
pp. 1194-1198
Author(s):  
Zhi Yun Wang ◽  
Xiao Long Ma ◽  
Lu Shen ◽  
Jing Lu
Keyword(s):  
Soft Soil ◽  
Three Dimensional ◽  
Engineering Application ◽  
Earth Pressure ◽  
Horizontal Displacement ◽  
General Purpose ◽  
Element Analysis ◽  
Bucket Foundation ◽  
Practical Engineering ◽  
The Stability

As a newly developed engineering structure, bucket foundation breakwater is adapted to soft soil. In this paper, the general-purpose finite element analysis package ABAQUS is employed to conduct three-dimensional numerical analyses on bucket foundation breakwater. Then earth pressure variation on bucket foundation is carried out under different loads of horizontal displacement. Through analysis it obtains the laws of the earth pressure on the meeting-wave side and the back-wave side of bucket foundation breakwater. This will provide the reference and the evidence of preliminary theory for the stability research and practical engineering application of bucket foundation breakwater.

Research on the Prefabricated Prestressed Cylinder Foundation of Wind Turbines in the Soft Soil Region

2011 ◽  
Vol 368-373 ◽  
pp. 461-464
Author(s):  
Ren Le Ma ◽  
Ming Yi Zhang
Keyword(s):  
Large Scale ◽  
Wind Farm ◽  
Rapid Development ◽  
Soft Soil ◽  
Earth Pressure ◽  
Element Analysis ◽  
Inland Wetlands ◽  
Lateral Earth Pressure ◽  
Practical Engineering ◽  
Improved Design

With the rapid development of inland wind farm in China, the costal wind farm still has not got large-scale development as the result of the higher cost of fan foundation and the more difficulty of construction. The prefabricated prestressed cylinder foundation (PPC foundation), as a new type of wind turbine foundation designed for the soft soil region such as the inter-tidal coastal zone and inland wetlands, is introduced in this paper. The condition of lateral earth pressure distribution around the foundation which determines the flexural capacity of fan foundation in the soft soil is studied. Through theoretical analysis and mathematical derivation, the result shows that the lateral earth pressure around PPC foundation is changed with depth by 1.5th power curve which has good fitting to the finite element analysis result. The simplified and improved design process is applied into the practical engineering and the good economy of PPC foundation is proved.

Finite Element Analysis of Double-Walled Steel Box Cofferdam

2011 ◽  
Vol 368-373 ◽  
pp. 2268-2273
Author(s):  
Mei Liang Yang ◽  
Zhen Hai Zeng ◽  
Fang Ping Zhong ◽  
Dan Chen
Keyword(s):  
Finite Element ◽  
Three Dimensional ◽  
Complex Stress ◽  
General Purpose ◽  
Good Effect ◽  
Stress And Strain ◽  
Element Analysis ◽  
Finite Element Software ◽  
Pile Cap ◽  
Practical Engineering

Steel cofferdam has an abroad application in high pile cap construction in deep water foundations. Because of the obvious three-dimensional effect and its complex stress and strain, the traditional simplified calculating method couldn’t reach the requirements of practical engineering. The general purpose finite element software Ansys was used to analyze the stress and strain of steel cofferdam and sealing concrete, and achieved a good effect to ensure the engineering safety.

Structural Stability Evaluation for Lifting Lug Design of Large Marine Engine by Finite Element Analysis

2007 ◽  
Vol 353-358 ◽  
pp. 2855-2859
Author(s):  
W.C. Lee ◽  
Chae Sil Kim ◽  
J.B. Na ◽  
D.H. Lee ◽  
S.Y. Cho ◽  
...  
Keyword(s):  
Finite Element ◽  
Three Dimensional ◽  
Design Procedure ◽  
Steel Structures ◽  
Stability Evaluation ◽  
Element Analysis ◽  
Marine Engines ◽  
Dimensional Finite Element ◽  
The Stability ◽  
Three Dimensional Finite Element

Since most marine engines are generally very huge and heavy, it is required to keep safety from accidents in dealing them. Several types of lifting lugs have been used to assemble hundred ton–large steel structures and carry the assembled engines. Recently a few crashes have been occurred in carrying engines due to breaking down the lugs. Although the stability evaluation of the lifting lug has therefore been very important for safety, systematic design procedure of the lugs, which includes the structural analysis considering stability, has few reported. This paper describes the three dimensional finite element structural modeling for a lifting lug, the studies for determining the reasonable loading and boundary conditions, and the stability evaluation with the results of structural analyses. It should be very helpful for designing the other types of lifting lugs with safety.

Nonlinear Finite Element Analysis of Super-Long Pile and Soil Interaction in Soft Soil

2011 ◽  
Vol 201-203 ◽  
pp. 1601-1605 ◽  
Author(s):  
Shang Ping Chen ◽  
Wen Juan Yao ◽  
Sheng Qing Zhu
Keyword(s):  
Finite Element ◽  
Constitutive Model ◽  
Soft Soil ◽  
Three Dimensional ◽  
Nonlinear Behavior ◽  
Element Model ◽  
Element Analysis ◽  
Friction Resistance ◽  
Tip Resistance ◽  
Side Friction

In this paper, a nonlinear three-dimensional finite element model for super-long pile and soil interaction is established. In this model, contact elements are applied to simulate the nonlinear behavior of interaction of super-long pile and soil. A nonlinear elastic constitutive model for concrete is employed to analyze stress-strain relation of pile shaft under the axial load and the Duncan-Chang’s nonlinear constitutive model is used to reflect nonlinear and inelastic properties of soil. The side friction resistance, axial force, pile-tip resistance, and developing trend of soil plastic deformation are obtained and compared with measured results from static load tests. It is demonstrated that a super-long pile has the properties of degradation of side friction resistance and asynchronous action between side and pile-tip resistance, which is different from piles with a short to medium length.

scholarly journals Vibration Control of Blade Section Based on Sliding Mode PI Tracking Method and OPC Technology

2019 ◽  
Vol 2019 ◽  
pp. 1-12 ◽  
Author(s):  
Tingrui Liu
Keyword(s):  
Vibration Control ◽  
Sliding Mode ◽  
Engineering Application ◽  
Control Input ◽  
Pi Method ◽  
Opc Technology ◽  
Practical Engineering ◽  
Blade Section ◽  
The Stability ◽  
And Control

Vibration control of the blade section of a wind turbine is investigated based on the sliding mode proportional-integral (SM-PI) method, i.e., sliding mode control (SMC) based on a PI controller. The structure is modeled as a 2D pretwisted blade section integrated with calculation of structural damping, which is subjected to flap/lead-lag vibrations of instability. To facilitate the hardware implementation of the control algorithm, the SM-PI method is applied to realize tracking for limited displacements and velocities. The SM-PI algorithm is a novel SMC algorithm based on the nominal model. It combines the effectiveness of the sliding mode algorithm for disturbance control and the stability of PID control for practical engineering application. The SM-PI design and stability analysis are discussed, with superiority and robustness and convergency control demonstrated. An experimental platform based on human-computer interaction using OPC technology is implemented, with position tracking for displacement and control input signal illustrated. The platform verifies the feasibility and effectiveness of the SM-PI algorithm in solving practical engineering problems, with online tuning of PI parameters realized by applying OPC technology.

Three-dimensional finite element modelling of a full-scale geosynthetic-reinforced, pile-supported embankment

2015 ◽  
Vol 52 (12) ◽  
pp. 2041-2054 ◽  
Author(s):  
R. Kerry Rowe ◽  
K.-W. Liu
Keyword(s):  
Finite Element ◽  
Soft Soil ◽  
Three Dimensional ◽  
Single Layer ◽  
Full Scale ◽  
Numerical Results ◽  
Element Analysis ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element ◽  
Pile Supported Embankment

The performance of four sections of a full-scale embankment constructed on soft soil is examined using a fully coupled and fully three-dimensional finite element analysis. The four sections had similar embankment loadings but different improvement options (one unimproved, one with pile-support only, one with a single layer geotextile-reinforced platform and pile-support, and one with two layers of geogrid-reinforced platform and pile-support). Like the field data, the numerical results show that the inclusion of piles decreases the settlement at the subsoil surface to 52% of that for the unimproved section, and the addition of a single layer of geotextile reinforcement (J = 800 kN/m) further reduced settlement to only 31% of that of the unimproved section. The effects of geosynthetic reinforcement and multiple layers of reinforcement on the performance of the pile-supported embankment are discussed. The relative load transfer is calculated using eight existing methods and they are compared with the field measurements and numerical results.

Optimum Design of Engine Test Bench Based on Finite Element Analysis

2011 ◽  
Vol 338 ◽  
pp. 255-258 ◽  
Author(s):  
Shao Bo Wen
Keyword(s):  
Test Bench ◽  
Excitation Frequency ◽  
Three Dimensional ◽  
Natural Vibration Frequency ◽  
Maximum Displacement ◽  
Element Analysis ◽  
Vehicle Engine ◽  
Stress And Deformation ◽  
The Stability ◽  
Engine Excitation

A test bench of vehicle engine is designed and the three-dimensional solid model is established in UG software. Then the model is imported into ANSYS software to conduct static stress analysis, the stress and deformation distribution of test bench are obtained, referenced the results and the bracket are optimized to improve support ability, the maximum stress and the maximum displacement of test bench decreased 66.9% and 76.9%, respectively. Lastly modal analysis of test bench is performed, the chassis base is strengthen design according to the first-order mode shape, then the first natural vibration frequency is heightened 91.0%, it is far away from the engine excitation frequency range, the stability of test bench is enhanced.

The Finite Element Analysis of South Cap Excavation of Left Branching of Ma on Shan Yangtze River Highway Bridge

2011 ◽  
Vol 255-260 ◽  
pp. 4207-4211
Author(s):  
Yue Zhang ◽  
Mi Zhou
Keyword(s):  
Yangtze River ◽  
Simulation Analysis ◽  
Soft Soil ◽  
Three Dimensional ◽  
Operating Conditions ◽  
Highway Bridge ◽  
Foundation Pit ◽  
Element Analysis ◽  
Calculation Results ◽  
Stress And Deformation

South pile foundation of Ma On Shan Yangtze River Highway Bridge is big, deep, soft soil, groundwater rich. In order to guarantee the safeties of the foundation, its foundation pit supporting schemes are compared, selected and calculated, finally lock mouth steel pipe support is selected as the design and construction scheme. The three-dimensional simulation analysis of the scheme is calculated by using MIDAS software, simulated four construction condition is presented, and stress and deformation results of retaining structure on various operating conditions is obtained. The calculation results show that the palisade structure basic satisfies the requirements of caps excavation and caps concrete construction. The results of construction show that the construction method, model and parameters used in this paper are basic right, the reasonableness of Supporting is confirmed and for the similar large foundation pit construction provides useful reference.

Study on the Lateral Displacement of Super-Long Pile under a Asymmetrical Surcharge Load in Soft Clay

2014 ◽  
Vol 580-583 ◽  
pp. 733-737
Author(s):  
Qi Li ◽  
Xiao Li Lu
Keyword(s):  
Lateral Displacement ◽  
Soft Soil ◽  
Soft Clay ◽  
Three Dimensional ◽  
Influence Factors ◽  
Major Influence ◽  
Small Contribution ◽  
Practical Engineering ◽  
Surcharge Load ◽  
Building Load

The pile will have a large lateral displacement in soft soil under the role of heaped load. Based on Biot consolidation theory, combined with a certain highway project, a three-dimensional FEM model is established, the process that the soil lateral deformation under heaped load lead to the pile side displacement was simulated. On the ground of the former result, the influence factors for the displacement of pile top and the pile displacement field distribution are analysed. The results show that, the building load area, load grade and the distance from loading area to pile have a major influence on the pile side displacement. On the other hand, the load on pile top have a very small contribution for stability of anti side displacement. The buildings nearby the area of pile foundation should be given attention in practical engineering.

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