Numerical Simulation of Ultimate Capacity of Suction Caisson Foundations by FEM

2012 ◽  
Vol 170-173 ◽  
pp. 3478-3481
Author(s):  
Zhi Yun Wang ◽  
Yue Sun ◽  
Chuan Cheng Wang
Keyword(s):  
Design Theory ◽  
Three Dimensional ◽  
General Purpose ◽  
Combined Loading ◽  
Engineering Practice ◽  
Element Analysis ◽  
Suction Caisson ◽  
Caisson Foundations ◽  
Marine Engineering ◽  
Suction Caisson Foundation

As a newly developed type of foundation for deep water offshore and marine engineering, the suction caisson is usually subjected to combined loading of vertically uplift load, horizontal load and moment. Performance evaluation and design theory for such a new type of foundation can not meet the basic requirements of engineering practice sufficiently at present. In this paper, the general-purpose finite element analysis package ABAQUS is employed to conduct three-dimensional numerical analyses on load-carrying features of suction caisson foundation. Then the ultimate bearing capacity of suction caisson foundation under monotonic load for two drainage conditions of the soil is evaluated by displacing-controlling procedure.

Bearing Capacity of Suction Caisson Foundations Using FEM Analysis

2011 ◽  
Vol 243-249 ◽  
pp. 2112-2115
Author(s):  
Zhi Yun Wang ◽  
Mao Tian Luan ◽  
Lu Shen
Keyword(s):  
Bearing Capacity ◽  
Three Dimensional ◽  
Numerical Procedure ◽  
Fem Analysis ◽  
General Purpose ◽  
Combine Loading ◽  
Element Analysis ◽  
Suction Caisson ◽  
Caisson Foundations ◽  
Suction Caisson Foundation

To understand features of bearing capacity of suction caisson foundation is one of the key issues in design and construction of deep-water marine structures. In this paper, the general-purpose finite element analysis package ABAQUS is employed to conduct three-dimensional numerical analyses on load-carrying features of suction caisson foundation under vertically uplift load, horizontal load and moment. Then the ultimate bearing capacity of suction caisson foundation for undrained condition of the soil is evaluated by displacing-controlling procedure. Moreover, three-dimensional failure envelope of suction caisson foundation under combine loading condition are established by the proposed numerical procedure.

Three-Dimensional Finite Element Analysis of Qingyi River Aqueduct during Operation Period

2014 ◽  
Vol 556-562 ◽  
pp. 679-682
Author(s):  
Yan Yan Zhang ◽  
Cai Ying Chen
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Rectangular Cross Section ◽  
Three Dimensional ◽  
Engineering Practice ◽  
Good Precision ◽  
Operation Condition ◽  
Element Analysis ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element

In this paper, finite element model of the Qingyi River rectangular section reinforced concrete aqueduct is set up by using three-dimensional finite element analysis software ANSYS. Considering the conventional static load, the seismic loads which use quasi-static method, and considering five combinations of operation condition of aqueduct in operation process, the structure stress and displacement rules of aqueduct are obtained in the different conditions. The results show that the rectangular cross-section aqueduct in the water level under the action of the full tank, the vertical displacement of the aqueduct body structure is nearly doubled than the empty slot, indicating the water load have a significant impact on the aqueduct. The calculated results has a good precision, can meet the needs of practical engineering, can provide a reference basis for the design of thin-walled rectangular aqueduct and the theoretical basis for engineering practice and guidance recommendations.

J-R Curves From Circumferentially Through-Wall-Cracked Pipe Tests Subjected to Combined Bending and Tension—Part II: Experimental and Analytical Validation

1998 ◽  
Vol 120 (4) ◽  
pp. 412-417 ◽  
Author(s):  
N. Miura ◽  
G. M. Wilkowski
Keyword(s):  
Internal Pressure ◽  
Three Dimensional ◽  
Combined Loading ◽  
Element Analysis ◽  
Dimensional Finite Element ◽  
Estimation Scheme ◽  
Materials Used ◽  
Three Dimensional Finite Element ◽  
Η Factor ◽  
J Estimation

In Part I (Miura and Wilkowski, 1998) of this paper, the theory of the two η-factor solutions for circumferentially through-wall-cracked pipes subjected to combined bending and tension due to internal pressure was presented. These solutions seemed to give reasonable predictions by comparing with the existing simplified J-estimation scheme. It was also ascertained that the J would be underestimated if the effect of the internal pressure was not properly considered. Consequently, this paper presents the application of these solutions to full-scale pipe tests. The tests were performed at 288°C (550°F) under combined bending and internal pressure. The materials used for the tests were both carbon steel and stainless steel. The effect of combined loading on the J-R curves was determined and compared to C(T) specimen J-R curves. The solutions were then verified by using three-dimensional finite element analysis.

Numerical Simulations of Full-Scale Corroded Pipe Tests With Combined Loading

1997 ◽  
Vol 119 (4) ◽  
pp. 457-466 ◽  
Author(s):  
S. Roy ◽  
S. Grigory ◽  
M. Smith ◽  
M. F. Kanninen ◽  
M. Anderson
Keyword(s):  
Finite Element ◽  
Three Dimensional ◽  
Full Scale ◽  
Combined Loading ◽  
Pipe Failure ◽  
Element Analysis ◽  
Line Pipe ◽  
Safety Margins ◽  
Failure Predictions ◽  
Three Dimensional Finite Element

The ANSI/ASME B31G guideline has been useful to pipeline operators in assessing the integrity of corroded line pipe. Because large safety margins have had to be incorporated, the guidelines can be excessively conservative, which in turn can force costly repairs and replacements that may not actually be necessary. On the other hand, because the current guidelines consider only pressure loading and neglect bending and axial compression, they could give nonconservative failure predictions when combined loading exists. Therefore, a study was initiated to develop a theoretically sound methodology for assessing the integrity of corroded line pipe subjected to combined loading. A key step in the successful application of this methodology is the development of a sophisticated three-dimensional finite element procedure that can accurately simulate full-scale pipe tests under conditions of combined loading. This paper describes thirteen full-scale failure tests on artificially corroded pipes subjected to simultaneous internal pressure, bending, and longitudinal compression and presents a detailed account of the finite element analysis procedure that was developed to simulate these tests numerically. Additional finite element analyses that were conducted to investigate the effect of key parameters on failure, and to expand the corroded pipe failure database, are also discussed.

Bearing Capacity of Suction Caisson for Offshore Floating Wind Turbine

2011 ◽  
Vol 243-249 ◽  
pp. 4718-4722
Author(s):  
Xiu Bin Gong ◽  
Qing Lai Fan ◽  
Ke Wu
Keyword(s):  
Bearing Capacity ◽  
Wind Turbine ◽  
Soft Clay ◽  
Combined Loading ◽  
Failure Envelope ◽  
Suction Caisson ◽  
Floating Wind Turbine ◽  
Failure Envelopes ◽  
Offshore Floating Wind Turbine ◽  
Suction Caisson Foundation

Presented in this paper are the three-dimensional nonlinear finite element analyses of the failure envelopes of suction caisson under torsion, vertical and lateral pullout combined load in soft clay. The soft clay under undrained condition is simulated by perfectly elasto-plastic Tresca model. Through the numerical analyses, the failure envelopes for combined loading (V-T、H-T、V-H-T) of suction caisson is reviewed. And the mathematical expression of failure envelope is deduced. It is shown that (1) the circular plastic failure area is outward-extending. (2) The bearing capacity of suction caisson foundation in V-T、H-T load spaces is increasing with the aspect ratio L/D. (3) The equation of failure envelope can be used to evaluate the stability of suction caisson foundation for offshore floating wind turbine.

Research on Influencing Factors of Welding Residual Stress of Welded Pipes

2014 ◽  
Vol 697 ◽  
pp. 293-297
Author(s):  
Lin Yue Bai ◽  
Ke Bin Jiang ◽  
Lei Gao ◽  
Jing Quan Wang
Keyword(s):  
Residual Stress ◽  
Three Dimensional ◽  
Element Model ◽  
General Purpose ◽  
Welding Residual Stress ◽  
Outer Diameter ◽  
Ansys Software ◽  
Element Analysis ◽  
Pipeline Welding ◽  
Dimensional Element

Analyzing the pipeline sheet of X70 level, the work also establishes three-dimensional element model of pipeline welding with ANSYS (software of large general purpose with finite element analysis). After comparing different plans, changes of outer diameter and wall thickness are found influencing distributing laws of welding residual stress of welded pipes. Thus, the laws are concluded.

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.

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