scholarly journals Numerical Modelling of Axially Loaded Helical Piles: Compressive Resistance

2021 ◽  
Vol 318 ◽  
pp. 01018
Author(s):  
Ahmed. S. Ali ◽  
Nahla. M. Salim ◽  
Husam. H. Baqir
Keyword(s):  
Finite Element ◽  
Bearing Capacity ◽  
Lateral Loads ◽  
The Finite Element Method ◽  
Pile Capacity ◽  
The World ◽  
Helical Piles ◽  
Parametric Analyses ◽  
Compressive Resistance ◽  
Plaxis 3D

Helical piles are foundation systems used to support compression, tension, and lateral loads. However, this type of piles was used around the world for more than 25 years. Its behavior, especially in Iraq, is still unknown and scare. The present study is carried out by analyses of this type of pile using the finite element method. Modeling of the helical pile geometry has been proposed using the finite element through the computer program Plaxis 3D. Parametric analyses were also performed. The main parametric study is the effect of a number of the helix, spacing between helix, the helix diameter, and helix configuration. The main conclusion is that as the number of helix increases, the bearing capacity increases further more than the higher the distance between helix, the higher bearing capacity. Maximum pile capacity with the case of three-helix increased by 115.4 %compared to the case without helix. Pile capacity with the case of spacing 3.5 D reached 130.7 % compared to the case of spacing 0.5 D. The value of displacement decreased with increasing spacing between the helices, while the value of displacement increased with the decrease in the spacing between the helices for top, middle, and bottom helix.

scholarly journals The Performance of Taper Helical Pile Embedded in Loose Sand Under Uplift Static and Cyclic Load Using 3D-Finite Element Analysis

2022 ◽  
Vol 961 (1) ◽  
pp. 012033
Author(s):  
Ahmed S. Ali ◽  
Nahla M. Salim ◽  
Husam H. Baqir
Keyword(s):  
Finite Element ◽  
Cyclic Load ◽  
Lateral Loads ◽  
The Finite Element Method ◽  
Element Analysis ◽  
3D Software ◽  
Soil Behaviour ◽  
Primary Variable ◽  
Model Technique ◽  
Plaxis 3D

Abstract Piles with helices are a kind of foundation that is capable of withstanding compression, tension, and lateral loads. However, for almost 25 years, this kind of Pile was widely used across the world. Its behaviour is unpredictable and terrifying, especially in Iraq. The present study analysed this kind of Pile using the finite element method. It was recommended that the helical pile geometry be modeled by numerical model technique and the computer program Plaxis 3D. The plaxis 3D software is a well-known geotechnical engineering tool that numerically analyses soil and simulates experimental work in terms of curve matching and outcomes. Furthermore, an analysis of variables was conducted. The primary variable research investigates the influence of the number of helices and the tapered helix distance under static and cyclic load. The final finding is that the more helices in a pile, the smaller the displacement (or amplitude) in comparison to one helix under the effect of uplift static and cyclic load. As a result that the effect of helix number on soil behaviour is more than the effect of changing the distances between helix.

Behavior of Square Hollow Section Steel Tubes Filled with Concrete under Different Loading Conditions

2014 ◽  
Vol 577 ◽  
pp. 1097-1103
Author(s):  
Tian De Jin ◽  
Lan Hui Guo
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Yield Strength ◽  
Bearing Capacity ◽  
Area Ratio ◽  
Loading Conditions ◽  
The Finite Element Method ◽  
Hollow Section ◽  
Core Concrete ◽  
Element Method

In this paper, the behavior of composite stub columns under different loading conditions is studied using the finite element method. The accuracy of the theoretical method is validated by comparing with the experimental results. The behavior of specimen under different loading conditions is analyzed. Then, based on the finite element method, the comparison of mechanical behavior under three typical loading conditions is studied. The results show that the difference on bearing capacity will become larger with the increase of steel area to concrete area ratio. For the core concrete loaded specimen with lower steel area-to-concrete area ratio, whose bearing capacity is the lowest, but its ductility is very good. With the increase of the steel yield strength, the bearing capacity will increase evidently for specimen loaded simultaneously. While for the specimen with only core concrete loaded, the steel yield strength has little influence except increase of ductility.

scholarly journals Method of Calculation Flexural Stiffness Over Natural Oscillations Frequencies

2018 ◽  
Vol 64 (4) ◽  
pp. 89-103
Author(s):  
A. Nesterenko ◽  
G. Stolpovskiy ◽  
M. Nesterenko
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Bearing Capacity ◽  
Flexural Stiffness ◽  
The Finite Element Method ◽  
Load Bearing Capacity ◽  
Natural Oscillations ◽  
Load Bearing ◽  
Resonance Frequencies ◽  
Element Method

AbstractThe actual load-bearing capacity of elements of a building system can be calculated by dynamic parameters, in particular by resonant frequency and compliance. The prerequisites for solving such a problem by the finite element method (FEM) are presented in the article. First, modern vibration tests demonstrate high accuracy in determination of these parameters, which reflects reliability of the diagnosis. Secondly, most modern computational complexes do not include a functional for calculating the load-bearing capacity of an element according to the input values of resonance frequencies. Thirdly, FEM is the basis for development of software tools for automating the computation process. The article presents the method for calculating flexural stiffness and moment of inertia of a beam construction system by its own frequencies. The method includes calculation algorithm realizing the finite element method.

scholarly journals REVIEW OF AVAILABLE APPROACHES FOR ULTIMATE BEARING CAPACITY OF TWO-LAYERED SOILS

2012 ◽  
Vol 18 (4) ◽  
pp. 469-482 ◽  
Author(s):  
M. Dalili Shoaei ◽  
A. Alkarni ◽  
J. Noorzaei ◽  
M. S. Jaafar ◽  
Bujang B. K. Huat
Keyword(s):  
Neural Network ◽  
Finite Element Method ◽  
Artificial Neural Network ◽  
Finite Element ◽  
Bearing Capacity ◽  
State Of The Art ◽  
Classical Method ◽  
Ultimate Bearing Capacity ◽  
Layered Soils ◽  
The Finite Element Method

This paper presents the state of the art report on available approaches to predicting the ultimate bearing capacity of two-layered soils. The article discusses three most popular methods, including the classical method, application of the finite element method and artificial neural network. Various approaches based on these three powerful tools are studied and their methodologies are discussed.

scholarly journals Pile Base and Shaft Capacity under Various Types of Loading

2021 ◽  
Vol 11 (8) ◽  
pp. 3396
Author(s):  
Michał Baca ◽  
Jarosław Rybak
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Numerical Simulations ◽  
Bearing Capacity ◽  
The Finite Element Method ◽  
Pipe Pile ◽  
Testing Method ◽  
Capacity Evaluation ◽  
Pile Testing ◽  
Similarities And Differences

Pile bearing capacity is usually understood as the sum of the bearing capacities of the pile’s base and shaft. Nevertheless, the behaviour of the pile base and shaft can be different, depending on what testing method is used for the evaluation of the bearing capacity. In this paper, three different methods of pipe pile testing are introduced, which make it possible to evaluate the pile base and shaft bearing capacities. On the basis of the tests conducted on a laboratory scale and numerical simulations performed with the finite element method, different approaches to bearing capacity evaluation have been compared. As a result, some similarities and differences between the applied methods are presented.

scholarly journals Finite Element Analysis of the Influence About the Space Between Bearing Expanded-Plate to the Bearing Capacity of Single Pile of the MEEP Pile

2015 ◽  
Vol 9 (1) ◽  
pp. 495-497 ◽  
Author(s):  
Yongmei Qian ◽  
Xihui Wang ◽  
Ruozhu Wang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Bearing Capacity ◽  
Single Pile ◽  
The Finite Element Method ◽  
Ansys Software ◽  
Element Analysis ◽  
Theoretical Support ◽  
Actual Design ◽  
Limiting Value

In this paper, by ANSYS software it is built that a computer simulation analyzing model according to the finite element method, which is analyzed that the failure mechanism of the main pile and the soil around the bearing expanded-plate of the Multi-Expanded-plates pile(the MEEP pile), it is qualitatively determined that the space between the bearing expanded-plates affect the bearing capacity of the single pile of the MEEP pile, and of which the lower limiting value is put forward, in order to provide the theoretical support to the actual design of the MEEP pile

Comparison of Analytical Solutions with Finite Element Solutions for Ultimate Bearing Capacity of Strip Footings

2013 ◽  
Vol 353-356 ◽  
pp. 3294-3303
Author(s):  
Zi Hang Dai ◽  
Xiang Xu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Bearing Capacity ◽  
Analytical Solutions ◽  
Numerical Solutions ◽  
Slip Surface ◽  
Ultimate Bearing Capacity ◽  
The Finite Element Method ◽  
Strip Footings ◽  
Element Method

The finite element method is used to compute the ultimate bearing capacity of a fictitious strip footing resting on the surface of c-φ weightless soils and a real strip footing buried in the c-φ soils with weight. In order to compare the numerical solutions with analytical solutions, the mainly existing analytical methods are briefly introduced and analyzed. To ensure the precision, most of analytical solutions are obtained by the corresponding formulas rather than table look-up. The first example shows that for c-φ weightless soil, the ABAQUS finite element solution is almost identical to the Prandtls closed solutions. Up to date, though no closed analytical solution is obtained for strip footings buried in c-φ soils with weight, the numerical approximate solutions obtained by the finite element method should be the closest to the real solutions. Apparently, the slip surface disclosed by the finite element method looks like Meyerhofs slip surface, but there are still some differences between the two. For example, the former having an upwarping curve may be another log spiral line, which begins from the water level of footing base to ground surface rather than a straight line like the latter. And the latter is more contractive than the former. Just because these reasons, Meyerhofs ultimate bearing capacity is lower than that of the numerical solution. Comparison between analytical and numerical solutions indicates that they have relatively large gaps. Therefore, finite element method can be a feasible and reliable method for computations of ultimate bearing capacity of practical strip footings.

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