Numerical Analysis on Settlement Law of an Underpinning Structure Composed of Piles and Beams

2010 ◽  
Vol 163-167 ◽  
pp. 3654-3661
Author(s):  
Qiang Jia ◽  
Fang Gu
Keyword(s):  
Three Dimensional ◽  
Element Model ◽  
Frame Structure ◽  
Settlement Location ◽  
Before And After ◽  
Dimensional Finite Element ◽  
Total Settlement ◽  
Width Change ◽  
Three Dimensional Finite Element ◽  
Column Bases

The settlement law during the underpinning process of a frame structure was analysed using the three-dimensional finite element model based on ANSYS program. The birth and death technique was adopted to simulate the work state of the underpinning structure and the underpinned piles. The secondary settlement deformations in the process of foundation underpinning can be simulated when the settlement values of the column bases before underpinning were applied to the underpinning structure. The settlement-location curves of the frame column bases before and after underpinning can be gained through path operation. The analysis results show that the settlement values and the differential settlements of the underpinning location increase obviously after underpinning, the medial deflection of the underpinning beam increases, and the settlement value of corresponding frame becomes bigger. The deformation of the underpinning beam occupys big proportion in the total settlement deformation. When the length diminishes and the diameter augments of the underpinning pile, the stiffness of the pile increases, therefore the settlement values and the differential settlements decrease. When the span diminishes and the height augments of the underpinning beam, the stiffness of the beam increases, accordingly the settlement values and the differential settlements decrease obviously. The width change of the underpinning beam has little influence on the settlement values and the differential settlements.

Lamb-Wave Based Technique for Multi-Site Damage Detection

2013 ◽  
Vol 577-578 ◽  
pp. 133-136 ◽  
Author(s):  
Z. Sharif-Khodaei ◽  
Omar Bacarreza ◽  
M.H. Aliabadi
Keyword(s):  
Good Accuracy ◽  
Lamb Waves ◽  
Three Dimensional ◽  
Element Model ◽  
Propagation Characteristic ◽  
Stiffened Panel ◽  
Imaging Algorithm ◽  
Before And After ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element

The propagation characteristic of Lamb waves activated by Piezoelectric actuators and collected by sensors in a stiffened panel has been investigated. A network of actuators is used to scan the structure before and after the presence of damage. A diagnostic imaging algorithm has been developed based on the probability of damage at each point of the structure measured by the signal reading of sensors in the baseline and damaged structure. A damage localization image is then reconstructed by superimposing the image obtained from each sensor-actuator path. Three-dimensional finite element model with a transducer network is modelled. Damage is introduced as a small softening area in the panel. Applying the imaging algorithm, the damage location was predicted with good accuracy. The validity of the algorithm was tested for multiple damages.

A Steel Headframe Structure before and after the Comparison and Analysis of the Performance of Process Modification

2013 ◽  
Vol 671-674 ◽  
pp. 606-610
Author(s):  
Jin Peng Sun ◽  
Jin Feng Jiao
Keyword(s):  
Finite Element ◽  
Coal Mine ◽  
Three Dimensional ◽  
Element Model ◽  
Technological Transformation ◽  
Finite Element Software ◽  
Process Modification ◽  
Before And After ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element

Because the coal mine derrick technology needs, to be in from the original winch system of backward 10m based on a new set of new ground winch system, resulting in the original derrick structure stress state change. By using SAP2000 finite element software, the establishment of three-dimensional finite element model, the dynamic characteristics and technological transformation and bar stress were analyzed, for the coal mine derrick technological transformation to provide certain reference.

Finite Element Analysis of Nonuniformity of Tires with Imperfections5

2007 ◽  
Vol 35 (3) ◽  
pp. 226-238 ◽  
Author(s):  
K. M. Jeong ◽  
K. W. Kim ◽  
H. G. Beom ◽  
J. U. Park
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Three Dimensional ◽  
Element Model ◽  
Radial Force ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Dimensional Finite Element ◽  
Force Variation ◽  
Three Dimensional Finite Element

Abstract The effects of variations in stiffness and geometry on the nonuniformity of tires are investigated by using the finite element analysis. In order to evaluate tire uniformity, a three-dimensional finite element model of the tire with imperfections is developed. This paper considers how imperfections, such as variations in stiffness or geometry and run-out, contribute to detrimental effects on tire nonuniformity. It is found that the radial force variation of a tire with imperfections depends strongly on the geometrical variations of the tire.

scholarly journals Internal Force on and Deformation of Steel Assembled Supporting Structure of Foundation Pit under Thermal Stress

2021 ◽  
Vol 11 (5) ◽  
pp. 2225
Author(s):  
Fu Wang ◽  
Guijun Shi ◽  
Wenbo Zhai ◽  
Bin Li ◽  
Chao Zhang ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Bending Moment ◽  
High Strength ◽  
Element Model ◽  
Internal Force ◽  
Foundation Pit ◽  
Dimensional Finite Element ◽  
Influence Of Temperature On ◽  
Scale Experiment ◽  
Three Dimensional Finite Element

The steel assembled support structure of a foundation pit can be assembled easily with high strength and recycling value. Steel’s performance is significantly affected by the surrounding temperature due to its temperature sensitivity. Here, a full-scale experiment was conducted to study the influence of temperature on the internal force and deformation of supporting structures, and a three-dimensional finite element model was established for comparative analysis. The test results showed that under the temperature effect, the deformation of the central retaining pile was composed of rigid rotation and flexural deformation, while the adjacent pile of central retaining pile only experienced flexural deformation. The stress on the retaining pile crown changed little, while more stress accumulated at the bottom. Compared with the crown beam and waist beam 2, the stress on waist beam 1 was significantly affected by the temperature and increased by about 0.70 MPa/°C. Meanwhile, the stress of the rigid panel was greatly affected by the temperature, increasing 78% and 82% when the temperature increased by 15 °C on rigid panel 1 and rigid panel 2, respectively. The comparative simulation results indicated that the bending moment and shear strength of pile 1 were markedly affected by the temperature, but pile 2 and pile 3 were basically stable. Lastly, as the temperature varied, waist beam 2 had the largest change in the deflection, followed by waist beam 1; the crown beam experienced the smallest change in the deflection.

Process Modeling in Laser Deposition of Multilayer SS410 Steel

2007 ◽  
Vol 129 (6) ◽  
pp. 1028-1034 ◽  
Author(s):  
Liang Wang ◽  
Sergio Felicelli
Keyword(s):  
Phase Transformation ◽  
Temperature Distribution ◽  
Three Dimensional ◽  
Element Model ◽  
Traverse Speed ◽  
Processing Parameters ◽  
Dimensional Finite Element ◽  
Net Shaping ◽  
Three Dimensional Finite Element ◽  
Continuous Cooling Transformation Diagram

A three-dimensional finite element model was developed to predict the temperature distribution and phase transformation in deposited stainless steel 410 (SS410) during the Laser Engineered Net Shaping (LENS™) rapid fabrication process. The development of the model was carried out using the SYSWELD software package. The model calculates the evolution of temperature in the part during the fabrication of a SS410 plate. The metallurgical transformations are taken into account using the temperature-dependent material properties and the continuous cooling transformation diagram. The ferritic and martensitic transformation as well as austenitization and tempering of martensite are considered. The influence of processing parameters such as laser power and traverse speed on the phase transformation and the consequent hardness are analyzed. The potential presence of porosity due to lack of fusion is also discussed. The results show that the temperature distribution, the microstructure, and hardness in the final part depend significantly on the processing parameters.

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