PERFORMANCE PREDICTION OF PREFABRICATED VERTICAL DRAIN IN SOFT SOIL USING FINITE ELEMENT METHOD

2015 ◽  
Vol 76 (2) ◽  
Author(s):  
Teh Zhi Huan ◽  
Rini Asnida Abdullah ◽  
Mohd For Mohd Amin ◽  
Mohd Azril Hezmi ◽  
Ahmad Safuan A Rashid ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Soft Soil ◽  
Computer Software ◽  
Time Rate ◽  
Element Analysis ◽  
Vertical Drain ◽  
Prefabricated Vertical Drain ◽  
Ultimate Settlement ◽  
Element Method

Prefabricated vertical drain (PVD) had successfully been applied in many soft ground construction projects. Finite element method (FEM) could assist designers to model very complex subsoil and structural elements. In this study, finite element analysis (FEA) is performed to verify the effectiveness of modelling of PVD in subsoil using computer software, Plaxis V8. The field settlement data were collected at two particular locations and were analysed using Asaoka’s method to estimate the ultimate settlement and back-calculated the coefficient of horizontal consolidation for these two particular location. Thereafter, by using back-calculated coefficient of horizontal consolidation, FEA were performed to predict the time rate settlement and compared against field settlement results. From the time rate settlement curves generated by FEM, the ultimate settlements were predicted using Asaoka’s method. The ultimate settlement predicted from FEM is slightly lower compared to actual field settlement monitoring result, but the degree of consolidation settlement achieved were higher.

scholarly journals PERENCANAAN PREFABRICATED VERTICAL DRAIN MENGGUNAKAN METODE ELEMEN UNTUK MEMPEROLEH POLA DAN JARAK YANG EFEKTIF

2020 ◽  
Vol 3 (3) ◽  
pp. 937
Author(s):  
Joshua Michael ◽  
Aksan Kawanda
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
One Dimensional ◽  
Vertical Drain ◽  
Soil Loading ◽  
Prefabricated Vertical Drain ◽  
Long Time ◽  
Speed Up ◽  
Push Out ◽  
Element Method

As a city develops, less areas will be available for constructions. Out of these available lands, a large quantity of areas has low soil bearing capacity and great amount of settlement. For this type of soil, loading is required in order to stabilize it. This will push out porewater contained inside the soil. However, reaching the expected settlement requires a long time, which can be solved by using prefabricated vertical drain to speed up the process. This is possible because prefabricated vertical drain decreases the travel distance of porewater to half of the vertical drain. Calculations for this thesis are done using one dimensional consolidation method, finite element method, and asaoka method for actual data calculation from the field. Using one dimensional consolidation method, with prefabricated vertical drain distance of 1.2 m in triangular pattern, resulted in settlement level of 2.048 m for 110 days. Using finite element method resulted in settlement level of 2.604 m for 120 days. On the other hand, using asaoka method resulted in settlement level of 1.422 m for 102 days. This difference is caused by lack of depth data from the laboratory.Semakin berkembangnya jaman maka pembangunan semakin banyak sehingga lahan untuk dilakukannya pembangunan semakin sedikit. Sekarang banyak tanah yang memiliki daya dukung kecil dan penurunan yang besar contohnya seperti tanah lunak. Agar tanah model ini dapat memiliki kondisi yang stabil , maka solusinya diberi beban sehingga air pori dari dalam tanah dapat tertekan keluar. Namun untuk mencapai penurunan yang diinginkan membutuhkan waktu yang cukup lama, disini digunakan metode prefabricated vertical drain untuk mempercepat penurunan. Prefabricated vertical drain disini membuat jarak tempuh air pori tanah yang sebelumnya setebal tanah lunak, menjadi setengah jarak antar prefabricated vertical drain. Perhitungan analisa pada skripsi ini menggunakan metode one dimensional consolidation, metode elemen hingga, dan metode asaoka sebagai perhitungan hasil aktual dari data lapangan. Penurunan total menggunakan metode one dimensional consolidation dengan jarak antar prefabricated vertical drain 1.2m dengan pola segitiga sebesar 2.048 m selama 110 hari, sedangkan dari metode elemen hingga didapatkan penurunan sebesar 2.604 m selama 120 hari. Dari data settlement recording yang dihitung menggunakan metode asaoka terjadi penurunan sebesar 1.422 m selama 102 hari. Perbedaan disini disebabkan oleh kurang banyaknya sample kedalaman dari data laboratorium.

Towards Predicting Relative Belt Edge Endurance With the Finite Element Method

1990 ◽  
Vol 18 (4) ◽  
pp. 216-235 ◽  
Author(s):  
J. De Eskinazi ◽  
K. Ishihara ◽  
H. Volk ◽  
T. C. Warholic
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Three Dimensional ◽  
The Finite Element Method ◽  
Shear Deformations ◽  
Element Analysis ◽  
Vertical Loading ◽  
Predicted Values ◽  
Element Method

Abstract The paper describes the intention of the authors to determine whether it is possible to predict relative belt edge endurance for radial passenger car tires using the finite element method. Three groups of tires with different belt edge configurations were tested on a fleet test in an attempt to validate predictions from the finite element results. A two-dimensional, axisymmetric finite element analysis was first used to determine if the results from such an analysis, with emphasis on the shear deformations between the belts, could be used to predict a relative ranking for belt edge endurance. It is shown that such an analysis can lead to erroneous conclusions. A three-dimensional analysis in which tires are modeled under free rotation and static vertical loading was performed next. This approach resulted in an improvement in the quality of the correlations. The differences in the predicted values of various stress analysis parameters for the three belt edge configurations are studied and their implication on predicting belt edge endurance is discussed.

Tire Cornering Simulation Using an Explicit Finite Element Analysis Code

1998 ◽  
Vol 26 (2) ◽  
pp. 109-119 ◽  
Author(s):  
M. Koishi ◽  
K. Kabe ◽  
M. Shiratori
Keyword(s):  
Finite Element Method ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Test System ◽  
Experimental Results ◽  
The Finite Element Method ◽  
Element Analysis ◽  
Explicit Finite Element ◽  
Explicit Finite Element Analysis ◽  
Element Method

Abstract The finite element method has been used widely in tire engineering. Most tire simulations using the finite element method are static analyses, because tires are very complex nonlinear structures. Recently, transient phenomena have been studied with explicit finite element analysis codes. In this paper, the authors demonstrate the feasibility of tire cornering simulation using an explicit finite element code, PAM-SHOCK. First, we propose the cornering simulation using the explicit finite element analysis code. To demonstrate the efficiency of the proposed simulation, computed cornering forces for a 175SR14 tire are compared with experimental results from an MTS Flat-Trac Tire Test System. The computed cornering forces agree well with experimental results. After that, parametric studies are conducted by using the proposed simulation.

scholarly journals Shape Sensing of a Complex Aeronautical Structure with Inverse Finite Element Method

Sensors ◽  
2021 ◽  
Vol 21 (4) ◽  
pp. 1388
Author(s):  
Daniele Oboe ◽  
Luca Colombo ◽  
Claudio Sbarufatti ◽  
Marco Giglio
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Boundary Conditions ◽  
Strain Field ◽  
Element Analysis ◽  
Inverse Finite Element Method ◽  
Shape Sensing ◽  
Definition Of ◽  
High Level ◽  
Element Method

The inverse Finite Element Method (iFEM) is receiving more attention for shape sensing due to its independence from the material properties and the external load. However, a proper definition of the model geometry with its boundary conditions is required, together with the acquisition of the structure’s strain field with optimized sensor networks. The iFEM model definition is not trivial in the case of complex structures, in particular, if sensors are not applied on the whole structure allowing just a partial definition of the input strain field. To overcome this issue, this research proposes a simplified iFEM model in which the geometrical complexity is reduced and boundary conditions are tuned with the superimposition of the effects to behave as the real structure. The procedure is assessed for a complex aeronautical structure, where the reference displacement field is first computed in a numerical framework with input strains coming from a direct finite element analysis, confirming the effectiveness of the iFEM based on a simplified geometry. Finally, the model is fed with experimentally acquired strain measurements and the performance of the method is assessed in presence of a high level of uncertainty.

Study on the Settlement of Soft Soil Subgrade with a Crust Layer

2014 ◽  
Vol 505-506 ◽  
pp. 82-88
Author(s):  
Da Zhi Wu ◽  
Zhen Ying Zhang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Soft Soil ◽  
The Finite Element Method ◽  
Crust Layer ◽  
Element Method

By using the finite element method, the settlement of soft soil subgrade with a crust layer has been investigated. To find the influence of thickness of the crust layer on the settlement, four different thicknesses, which are 0.0m, 1.5m, 3.5m and 5.5m, are selected. Besides, the settlement during the construction and post construction are also analyzed. It is found that the crust layer can reduce the settlement and uneven settlement of subgrade effectively. Besides, the settlement of the subgrade decreases with the increase of the thickness of crust layer. Moreover, with the increase of time, the uneven settlement of the pavement increases gradually. And when the time is up to a certain degree, the uneven settlement tends to be stable.

scholarly journals COMPARISON OF SAW BLADE NATURAL FREQUENCIES AND CRITICAL SPEEDS USING CSAW AND FINITE ELEMENT ANALYSIS

2011 ◽  
Author(s):  
J. Poirier ◽  
P. Radziszewski
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Natural Frequencies ◽  
Element Model ◽  
The Finite Element Method ◽  
Element Analysis ◽  
Saw Blade ◽  
Circular Saws ◽  
The Finite Element Model ◽  
Element Method

The natural frequencies of circular saws limit the operating speeds of the saws. Current industry methods of increasing natural frequency include pretensioning, where plastic deformation is induced into the saw. To better model the saw, the finite element model is compared to current software for steel saws; C-SAW, a software program that calculates frequencies for stiffened circular saws. Using C-SAW and the finite element method the results are compared and the finite element method is validated for steel saws.

scholarly journals Experimental Results of SiC reinforced Al2O3 Matrix Ceramic Matrix Composites Validated with Finite Element Method

2019 ◽  
Vol 8 (12) ◽  
pp. 307-310
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Ceramic Matrix Composites ◽  
Experimental Results ◽  
Matrix Composites ◽  
Metal Oxidation ◽  
Element Analysis ◽  
Advanced Analysis ◽  
Al2o3 Matrix ◽  
Element Method

In this paper, SiCp /Al2O3 composites were fabricated through directed metal oxidation process. Experimental results of these composites validated or compared with Finite Element Method (FEM). Finite Element has become one in all the foremost necessary tools offered to an engineer. The finite part methodology is employed to resolve advanced analysis issues. In this paper, Finite Element Method based ANSYS software is used to FEM model to determine mechanical properties of SiC reinforced Al2O3 matrix composite by changing volume fractions of SiC. The comparison of experimental results with Finite element analysis provides detailed information about the results of these comparisons. The FA was competent of predict the information for several scenario quite fine

Probabilistic Finite-Element Analysis of Airfield Pavements

1996 ◽  
Vol 1540 (1) ◽  
pp. 29-38 ◽  
Author(s):  
Yuan Jie Lua ◽  
Robert H. Sues
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Spatial Variability ◽  
Life Prediction ◽  
Homogeneous Layer ◽  
Response Analysis ◽  
Element Analysis ◽  
Analysis And Design ◽  
Pavement Structures ◽  
Element Method

Mechanistic pavement analysis and design based on either layered elastic analysis (LEA) or the finite element method (FEM) is increasingly being used to replace the empirical design process. The simplifying assumptions of a uniform, homogeneous layer of linear material used in LEA can render its analysis inaccurate for real pavement structures. The FEM is more attractive for structural analysis of pavements; the generality of the FEM also allows both the use of comprehensive material models and modeling of the spatial variability that exists in pavement systems. To date, spatial variability and uncertainty are ignored in pavement system finite element analyses. Ignoring spatial variability and uncertainty implies a false sense of accuracy in the results and can lead to inaccurate assessment of the pavement. The first application of the probabilistic finite element method to pavement response analysis and life prediction and the first investigation of the effects of spatial variability on pavement life prediction are presented. It is concluded that the probabilistic FEA, with spatial variability, is a more accurate representation of the true physical condition and leads to results that are less conservative than those obtained with probabilistic LEA.

Rigid–plastic limit analysis of discontinuous media by a finite element method

1989 ◽  
Vol 26 (3) ◽  
pp. 369-374 ◽  
Author(s):  
T. Tamura ◽  
R. Y. S. Pak
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Bearing Capacity ◽  
Limit Analysis ◽  
Constitutive Law ◽  
Rigid Plastic ◽  
Element Analysis ◽  
Plastic Limit Analysis ◽  
Surface Foundation ◽  
Element Method

This paper describes the formulation of a finite element method by which a limit analysis of a rigid–plastic medium with discontinuities can be performed. The Drucker–Prager criterion is adopted to describe the yielding of the medium, while the Mohr–Coulomb law is used to model the interface of the discontinuous velocity fields. Both associated and nonassociated flow rules are considered in the constitutive characterization. Results are presented to illustrate the influence of discontinuities on the bearing capacity of a surface foundation. Key words: bearing capacity, constitutive law, dilatancy, discontinuity, limit, plasticity, finite element analysis.

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