Finite element analyses of negative skin friction on a single pile

2012 ◽  
Vol 7 (3) ◽  
pp. 239-252 ◽  
Author(s):  
Jinyuan Liu ◽  
Hongmei Gao ◽  
Hanlong Liu
Keyword(s):  
Finite Element ◽  
Skin Friction ◽  
Single Pile ◽  
Finite Element Analyses ◽  
Negative Skin Friction

scholarly journals Finite element analyses of energy piles using different constitutive models

2020 ◽  
Vol 205 ◽  
pp. 05013
Author(s):  
Chiara Iodice ◽  
Raffaele Di Laora ◽  
Alessandro Mandolini
Keyword(s):  
Finite Element ◽  
Constitutive Models ◽  
Single Pile ◽  
Finite Element Analyses ◽  
Energy Pile ◽  
State Of Stress ◽  
Modified Cam Clay ◽  
Energy Piles ◽  
Fully Coupled ◽  
Cam Clay

Energy piles are foundation elements having the double scope of transferring structural loads from the structure to the ground and of exchanging heat with the surrounding soil. It follows that pile state of stress and settlement are altered by the time-dependent temperature change in both pile and soil. This work is aimed at investigating the effect of thermal cycles on the behaviour of a single energy pile. To this end, fully coupled thermo-hydro-mechanical analyses have been carried out using the Finite Element code ABAQUS. The single pile is installed in a normally consolidated clay behaving according to different constitutive models involving Mohr-Coulomb, Modified Cam Clay and Hypoplastic. The latter is employed with and without the thermal formulation capable of accounting for the thermal collapse of NC clays during heating. A single free-head pile is considered and the results are presented in terms of pile axial force and settlement developed cycle by cycle.

Design of flexure revolute joint based on compliance and stiffness ellipsoids

2021 ◽  
pp. 095441002110169
Author(s):  
Jing Zhang ◽  
Hong-wei Guo ◽  
Juan Wu ◽  
Zi-ming Kou ◽  
Anders Eriksson
Keyword(s):  
Finite Element ◽  
Single Point ◽  
Synthesis Method ◽  
Nonlinear Finite Element ◽  
Finite Element Analyses ◽  
Rotational Stiffness ◽  
Rotational Angle ◽  
Parameterized Model ◽  
Flexure Joints ◽  
Translational Stiffness

In view of the problems of low accuracy, small rotational angle, and large impact caused by flexure joints during the deployment process, an integrated flexure revolute (FR) joint for folding mechanisms was designed. The design was based on the method of compliance and stiffness ellipsoids, using a compliant dyad building block as its flexible unit. Using the single-point synthesis method, the parameterized model of the flexible unit was established to achieve a reasonable allocation of flexibility in different directions. Based on the single-parameter error analysis, two error models were established to evaluate the designed flexure joint. The rotational stiffness, the translational stiffness, and the maximum rotational angle of the joints were analyzed by nonlinear finite element analyses. The rotational angle of one joint can reach 25.5° in one direction. The rotational angle of the series FR joint can achieve 50° in one direction. Experiments on single and series flexure joints were carried out to verify the correctness of the design and analysis of the flexure joint.

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