Design parameter optimization of beam foundation on soft soil layer with nonlinear finite element

2012 ◽  
Vol 19 (6) ◽  
pp. 1753-1763 ◽  
Author(s):  
Hong-wei Wei ◽  
Ya-zhong Wu ◽  
Ze-hong Yu
Keyword(s):  
Finite Element ◽  
Parameter Optimization ◽  
Design Parameter ◽  
Soft Soil ◽  
Soil Layer ◽  
Nonlinear Finite Element ◽  
Beam Foundation

Finite Element Analysis of Bridge-Foundation Interaction System under Horizontal Seismic Excitation

2014 ◽  
Vol 490-491 ◽  
pp. 691-694
Author(s):  
Shou Long Chen ◽  
Chun Yi Cui ◽  
Yan Sun
Keyword(s):  
Finite Element ◽  
Seismic Waves ◽  
Soil Depth ◽  
Soft Soil ◽  
Soil Layer ◽  
Element Analysis ◽  
Interaction System ◽  
Frequency Components ◽  
Bridge Foundation ◽  
Pile Length

Based on Newmark-β gradual integration method and elastic-plastic mechanical theory, numeriacl analyses of effects of soft soil depth and thickness and pile length on the characteristics of horizontal seismic response of bridge-foundation interaction system with soft layers conducted by using finite element program Midas/GTS. The numerical results show that: (1) The high frequency components of seismic excitations can be filtered and the low frequency components are amplified correspondingly when seismic waves are transmitted through soft soil layer, and thicker and lower soft soil layer can amplified this effects; (2)The extremum force of abutment shows decreases first then increases with depth decreasing, and displacement of abutment top and bottom has the same law with seismic waves, and the thicker and lower soft soil layer or shorter piles can aggravate abutment force and deformation; (3)Shear extremal stress shows decrease from top to bottom and the thicker and lower soft soil layer or shorter piles are adverse on piles; (4)Moment extremal expresses first increase then decrease with pile length and the lower and thicker soft soil layer or shorter piles can enlarged piles moment.

Character of the Lateral Displacement of Soft Soil Foundation under Embankment

2011 ◽  
Vol 197-198 ◽  
pp. 987-991
Author(s):  
Jie Qun Liu ◽  
Jin Long Liu
Keyword(s):  
Finite Element Method ◽  
Lateral Displacement ◽  
Soft Soil ◽  
Soil Layer ◽  
Measuring Method ◽  
Vertical Surface ◽  
Nonlinear Finite Element ◽  
Nonlinear Finite Element Method ◽  
Soil Foundation ◽  
Soft Soil Foundation

In order to analyze the characteristic of lateral displacement of soft soil foundation under embankment, a typical embankment is studied systemically with nonlinear finite element method, and the location of maximal lateral displacement and its measuring method is also discussed. It is pointed that lateral displacement would be reduced possibly at consolidation stage with strong dry crust and thick soft soil layer, which happened synchronously with vertical settlement increased rapidly. This phenomena could not be measured conveniently with inclinometer pipe, for there are many shortcomings within this technique, although which has been used in engineering widely. It is also shown that the location of the maximal lateral displacement is changeable at different construction stages, which more likely lies in the vertical surface between the toe and the middle of slope of embankment. In order to get the maximal lateral displacement reasonably, it is suggested that the inclinometer pipes should be placed in that area of embankment.

Study of Grouting Reinforcement to Disturbance Soft SOIL Caused by Large Diameter Slurry Shield Construction

2013 ◽  
Vol 790 ◽  
pp. 401-404
Author(s):  
Jian Ming Zhu ◽  
Hai Feng Cheng
Keyword(s):  
Finite Element ◽  
Soft Soil ◽  
Large Diameter ◽  
Soil Layer ◽  
Element Model ◽  
Vertical Displacement ◽  
Soil Disturbance ◽  
Finite Element Software ◽  
Grouting Reinforcement ◽  
Slurry Shield

Study of grouting reinforcement to disturbance soft soil caused by large diameter slurry shield construction based on Jiangyin Chengjiang West Road over the river tunnel project. First, Three-dimensional finite element model is created to use the ABAQUS finite element software, considering nonlinear deformation of soil in the numerical calculations. By numerical simulation: horizontal, vertical, vertical displacement trends are in accordance with the measured data; increase the layer E, C, φ values can effectively reduce the settlement of soft soil layer, reducing the soil disturbance. Therefore, through grouting reinforcement of upper soil can reduce soil settlement and get to the purpose of reducing the soil disturbance.

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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