scholarly journals DYNAMIC IMPEDANCE OF A LARGE SCALE PILE-GROUP

1993 ◽  
Vol 447 (0) ◽  
pp. 57-66
Author(s):  
Kiyoshi MASUDA ◽  
Kenji MIURA ◽  
Eiji KITAMURA ◽  
Yuji MIYAMOTO
Keyword(s):  
Large Scale ◽  
Pile Group ◽  
Dynamic Impedance

scholarly journals Applications of Symmetric and Nonsymmetric MSSOR Preconditioners to Large-Scale Biot's Consolidation Problems with Nonassociated Plasticity

2012 ◽  
Vol 2012 ◽  
pp. 1-15 ◽  
Author(s):  
Xi Chen ◽  
Kok Kwang Phoon
Keyword(s):  
Linear Systems ◽  
Large Scale ◽  
Iterative Scheme ◽  
Linear Equations ◽  
Pile Group ◽  
Newton Iteration ◽  
Soil Consolidation ◽  
Considerable Potential ◽  
Stiffness Method ◽  
Biot’S Consolidation

Two solution schemes are proposed and compared for large 3D soil consolidation problems with nonassociated plasticity. One solution scheme results in the nonsymmetric linear equations due to the Newton iteration, while the other leads to the symmetric linear systems due to the symmetrized stiffness strategies. To solve the resulting linear systems, the QMR and SQMR solver are employed in conjunction with nonsymmetric and symmetric MSSOR preconditioner, respectively. A simple footing example and a pile-group example are used to assess the performance of the two solution schemes. Numerical results disclose that compared to the Newton iterative scheme, the symmetric stiffness schemes combined with adequate acceleration strategy may lead to a significant reduction in total computer runtime as well as in memory requirement, indicating that the accelerated symmetric stiffness method has considerable potential to be exploited to solve very large problems.

Seismic performance of pile group-structure system in liquefiable and non-liquefiable soil from large-scale shake table tests

2020 ◽  
Vol 138 ◽  
pp. 106299 ◽  
Author(s):  
Chengshun Xu ◽  
Pengfei Dou ◽  
Xiuli Du ◽  
M. Hesham El Naggar ◽  
Masakatsu Miyajima ◽  
...  
Keyword(s):  
Seismic Performance ◽  
Large Scale ◽  
Group Structure ◽  
Pile Group ◽  
Shake Table ◽  
Shake Table Tests ◽  
Structure System ◽  
Liquefiable Soil

Experimental Research on Failure Mode of Micro-Pile in Landslide Reinforcement

2012 ◽  
Vol 226-228 ◽  
pp. 1338-1342
Author(s):  
Shu Feng Wang ◽  
Yong Peng Fu ◽  
Xin Zhao
Keyword(s):  
Failure Mode ◽  
Large Scale ◽  
Load Transfer ◽  
Slip Surface ◽  
Bending Moment ◽  
Pile Group ◽  
Physical Model Test ◽  
Pile Diameter ◽  
Surface Failure ◽  
Numerical Magnitudes

In recent years, micro-pile has been widely applied to landslide treatment engineering due to its advantages in application and construction, and the engineering effect is very evident. Large-scale physical model test was made for studying failure mode of micro-pile group in landslide, which indicated that numerical magnitudes between the displacement and the stress of the piles are better consistent along the load transfer direction. Concentrated destruction points locate on about three times the pile diameter up and down the slip surface. Failure mode of micro-pile in landslide treatment engineering is: pile of the loaded segment usually breaks for bending moment and shear force, and back of sliding side mainly exposes to the tension role, compared to role of tension of anchored segment in front of the micro-piles and compression behind of the piles.

Vibration tests on pile-group foundations using large-scale blast excitation

2005 ◽  
Vol 235 (17-19) ◽  
pp. 2087-2098 ◽  
Author(s):  
Hideo Tanaka ◽  
Katsuichirou Hijikata ◽  
Takayuki Hashimoto ◽  
Kazushige Fujiwara ◽  
Osamu Kontani ◽  
...  
Keyword(s):  
Large Scale ◽  
Pile Group ◽  
Vibration Tests

scholarly journals Dynamic Impedance of the Wide-Shallow Bucket Foundation for Offshore Wind Turbine using Coupled Finite–Infinite Element Method

Energies ◽  
2019 ◽  
Vol 12 (22) ◽  
pp. 4370 ◽  
Author(s):  
Lian ◽  
Jiang ◽  
Dong ◽  
Zhao ◽  
Zhao
Keyword(s):  
Large Scale ◽  
Dynamic Responses ◽  
Offshore Wind ◽  
Offshore Wind Turbine ◽  
Soil Thickness ◽  
Soil Stiffness ◽  
Bucket Foundation ◽  
Infinite Element ◽  
Dynamic Impedance ◽  
Element Technique

The dynamic impedances of foundation play an important role in the dynamic behavior and structural stability of offshore wind turbines (OWT). Though the behaviors of bucket foundation, which are considered as a relatively innovative foundation type under static loading, have been extensively investigated, the corresponding dynamic performances were neglected in previous research. This study focuses on the dynamic impedances of wide-shallow bucket foundations (WSBF) under the horizontal and rocking loads. Firstly, the numerical model was established to obtain the dynamic impedances of WSBF using the coupled finite-infinite element technique (FE-IFE). The crucial parameters affecting the dynamic responses of WSBF are investigated. It is shown that the skirt length mainly affects the rocking dynamic impedance and the diameter significantly affects the horizontal and coupling impedances, especially when the diameter is larger than 34 m. The overall dynamic responses of WSBF are profoundly affected by the relative soil thickness and the multi-layer soil stiffness. Additionally, dynamic impedances of WSBF are insensitive to the homogeneous soil stiffness. Lastly, the safety threshold curve was calculated according to the OWT, which can provide essential reference for the design of the OWT supported by large scale WSBF.

scholarly journals LATERAL LOADING TESTS ON A MODEL PILE GROUP IN LIQUEFIED SOIL USING LARGE-SCALE LAMINAR SHEAR BOX

2003 ◽  
Vol 68 (572) ◽  
pp. 117-122 ◽  
Author(s):  
Akihiko UCHIDA ◽  
Junji HAMADA ◽  
Tomio TSUCHIYA ◽  
Kiyoshi YAMASHITA ◽  
Masaaki KAKURAI
Keyword(s):  
Large Scale ◽  
Pile Group ◽  
Lateral Loading ◽  
Model Pile ◽  
Loading Tests ◽  
Shear Box ◽  
Laminar Shear ◽  
Laminar Shear Box

scholarly journals Large-scale model tests of a single pile and two-pile groups for an offshore platform in sand

2021 ◽  
Author(s):  
Aligi Foglia ◽  
Khalid Abdel-Rahman ◽  
Elmar Wisotzki ◽  
Tulio Quiroz ◽  
Martin Achmus
Keyword(s):  
Large Scale ◽  
Load Transfer ◽  
Pile Group ◽  
Scale Model ◽  
Single Pile ◽  
Pile Groups ◽  
Group Efficiency ◽  
Large Scale Model ◽  
Load Tests ◽  
The Given

Estimating pile group efficiency for open-ended steel piles in small group arrangements is a challenging task for designers. This paper reports on the large-scale experimental campaign performed for the BorWin gamma offshore converter platform, which involved single piles and two-pile group systems on a scale of 1:10. The experimental works included installation, dynamic end-of-driving tests, dynamic restrike tests, and static load tests of a single pile and a pair of two-pile groups in densely compacted, artificially prepared homogeneous sand. The CPT profiles and the blow counts confirmed that the foundation systems are comparable to each other. The experimental results of the single pile system were compared with conventional design methods. Such comparison indicated that CPT-based methods and load-transfer methods are applicable at the considered model scale. The bearing capacity prediction obtained via the CAPWAP method is conservative with respect to the static capacity. A consistent setup effect can be detected by analyzing the complete dynamic loading session. The pile group efficiency for the given foundation system was found to be less than 1.0 at both very small and very large soil strains, while it equaled 1.0 at failure.

Analysis for Interaction of Pile Group of Variable Stiffness Composite Foundation

2013 ◽  
Vol 753-755 ◽  
pp. 771-775
Author(s):  
Su Fen Zhang ◽  
Jian Hui Zhang ◽  
Xiao Yang Wang
Keyword(s):  
Design Optimization ◽  
Large Scale ◽  
Variable Stiffness ◽  
Pile Group ◽  
Composite Foundation ◽  
Scale Model ◽  
Large Scale Model ◽  
Pile Interaction

In the paper, a set of analysis formulas of pile-group of variable stiffness composite foundations was derived.The reasonability and reliability of the proposed method were showed by the results of a large scale model experiment.It is valuable to the analysis of the pile-group of composite settlement, the design optimization and the study of mechanism of pile-to-pile interaction.

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