The Influence of Different Resistance on Stability of Curve Jointless Line

2013 ◽  
Vol 744 ◽  
pp. 132-136
Author(s):  
Jun Bin Yang ◽  
Feng Dai ◽  
Xue Yi Liu
Keyword(s):  
Finite Element ◽  
Temperature Rise ◽  
Computational Efficiency ◽  
Lateral Displacement ◽  
Finite Element Models ◽  
Lateral Resistance ◽  
The Stability ◽  
Curve Radius ◽  
Allowable Temperature

To study the influence of different resistances on curve jointless line with allowable temperature rise, three kinds of finite element models are established by ANSYS to calculate the allowable temperature rise respectively with 2mm lateral displacement in five different curve jointless lines when both longitudinal and lateral resistance are nonlinear. And then we compare the results of three finite element models with that of wavelength equal model. It is shown that the effect of resistance on the allowable temperature rise of curve jointless lines goes less as the curve radius becomes longer. These 3 finite element models can be adopted to analyze stability of curve jointless lines. Considering the difficulty in model and computational efficiency, the second model in the thesis is highly recommended when analyzing the stability of curve jointless lines.

scholarly journals Out-of-plane local mechanism analysis with finite element method

2021 ◽  
Vol 8 (1) ◽  
pp. 130-136
Author(s):  
Roberto Spagnuolo
Keyword(s):  
Finite Element ◽  
Masonry Walls ◽  
Finite Element Models ◽  
Mechanism Analysis ◽  
Fem Method ◽  
Local Mechanism ◽  
Out Of Plane ◽  
Smeared Crack ◽  
The Stability ◽  
No Tension Material

Abstract The stability check of masonry structures is a debated problem in Italy that poses serious problems for its extensive use. Indeed, the danger of out of plane collapse of masonry walls, which is one of the more challenging to evaluate, is traditionally addressed not using finite element models (FEM). The power of FEM is not properly used and some simplified method are preferred. In this paper the use of the thrust surface is suggested. This concept allows to to evaluate the eccentricity of the membrane stresses using the FEM method. For this purpose a sophisticated, layered, finite element with a no-tension material is used. To model a no-tension material we used the smeared crack method as it is not mesh-dependent and it is well known since the early ’80 in an ASCE Report [1]. The described element has been implemented by the author in the program Nòlian by Softing.

Large-deformation finite element analysis of pipe penetration and large-amplitude lateral displacement

2010 ◽  
Vol 47 (8) ◽  
pp. 842-856 ◽  
Author(s):  
Dong Wang ◽  
David J. White ◽  
Mark F. Randolph
Keyword(s):  
Finite Element ◽  
Large Deformation ◽  
Lateral Displacement ◽  
Soil Surface ◽  
Element Analysis ◽  
Rate Dependent ◽  
Soil Failure ◽  
Lateral Resistance ◽  
Flow Mechanisms ◽  
Soil Flow

Seabed pipelines must be designed to accommodate thermal expansion — which is commonly achieved through controlled lateral buckling — and to resist damage from submarine slides. In both cases, the pipe moves laterally by a significant distance and the overall pipeline response is strongly influenced by the lateral pipe–soil resistance. Here, the process of pipe penetration and lateral displacement is investigated using a large-deformation finite element method, with a softening rate–dependent soil model being incorporated. The calculated soil flow mechanisms, pipe resistances, and trajectories agree well with plasticity solutions and centrifuge test data. It was found that the lateral resistance is strongly influenced by soil heave during penetration and the berm formed ahead of the pipe during lateral displacement. For “light” pipes, the pipe rises to the soil surface and the soil failure mechanism involves sliding at the base of the berm. In contrast, “heavy” pipes dive downwards and a deep shearing zone is mobilized, expanding with continuing lateral movement. The different responses are reconciled by defining an “effective embedment” that includes the effect of the soil berm or wall ahead of the pipe. The relationship between normalized lateral resistance and effective embedment is well fitted using a power law.

Character of Embankment Reinforced with Geotextile on Sloping Weak Foundation

2010 ◽  
Vol 168-170 ◽  
pp. 1272-1276
Author(s):  
Jin Long Liu ◽  
Jie Qun Liu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Plastic Zone ◽  
Lateral Displacement ◽  
Nonlinear Finite Element ◽  
Nonlinear Finite Element Method ◽  
The Stability ◽  
Peak Value ◽  
Element Method

Based on nonlinear finite element method, the character of embankment reinforced with geotextile on sloping weak foundation has been studied. It is shown that the lateral displacement of embankment has been distinctly effected by the sloping of foundation, the value of lateral displacement on sloping foundation is greatly bigger than that of horizontal foundation. The peak value of lateral displacement can be effectively reduced by geotextile. With the same condition, geotextile in sloping foundation acts a more important effect than that of horizontal foundation. The development of plastic zone of embankment has been impeded and separated by geotextile, which enhanced the stability of embankment. The results also indicated that, if necessary, reinforcement such as anti-slide pile should be layout at lower toe of embankment on sloping weak foundation.

scholarly journals A New Appliance for Improving the Miniscrew Stability

2016 ◽  
Vol 2016 ◽  
pp. 1-6
Author(s):  
Nurhat Ozkalayci ◽  
Mehmet Yetmez
Keyword(s):  
Finite Element ◽  
Stability Analysis ◽  
Primary Stability ◽  
Position Angle ◽  
Cortical Layer ◽  
Finite Element Models ◽  
Constant Force ◽  
The Stability

The aim of this study is to present a new appliance called stability leg designed as an additional anchorage providing device for increasing primary stability of orthodontic miniscrew. For this purpose, two finite element models (FEMs) with two different cortical layer thicknesses of 1 mm and 2 mm are considered. In order to achieve the stability analysis, these two main models, namely, Model I and Model II, are divided into subgroups according to stability leg lengths. Two types of forces are considered. (1) First force is a constant force of 1 N which is applied to all two models. (2) Second force is defined in the range of 1–4 N. Each of 1, 2.5, and 4 N of the second force is applied with a position angle ranging from 34° to 44°. Results show that stability of a miniscrew with 5 mm leg increases primary stability of the miniscrew.

Research of Effect on the Levee by Drawdown of Caisson Foundation of the North Anchorage of Maanshan Yangtze River Bridge

2013 ◽  
Vol 779-780 ◽  
pp. 619-625
Author(s):  
Yi Liu ◽  
Yan Hua Yang ◽  
Fu Quan Ji
Keyword(s):  
Finite Element ◽  
Yangtze River ◽  
Finite Element Models ◽  
Two Dimensional ◽  
The Yangtze River ◽  
Seepage Field ◽  
Seepage Analysis ◽  
The North ◽  
Stability Against Sliding ◽  
The Stability

On account of the north anchorage of Maanshan Yangtze River bridge, the drawdown of caisson foundation may bring about new seepage field of the ground, which make soil consolidate. This paper build two-dimensional plane strain finite-element models of open caisson and the Yangtze River levee, which aim to analyze the effect on the Yangtze River levee by drawdown of the open caisson foundation. Through the seepage analysis of the open caisson foundation and the stability analysis of the slope, this paper obtain the settlement and coefficients of stability against sliding of the Yangtze River levee.

Characters of Expressway Widened Engineering Reinforced with Geotextile

2010 ◽  
Vol 152-153 ◽  
pp. 1166-1170
Author(s):  
Jin Long Liu ◽  
Jie Qun Liu ◽  
Lu Wang Chen
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Lateral Displacement ◽  
High Stress ◽  
Failure Surface ◽  
Nonlinear Finite Element ◽  
Nonlinear Finite Element Method ◽  
Stress Zone ◽  
The Stability ◽  
High Stress Zone

Based on nonlinear finite element method, the character of expressway widened engineering reinforced with geotextile is studied. It is found that the main vertical settlement, lateral displacement and failure surface of embankment occurred in the widened part of embankment. The lateral displacement decreased, the total incremental of displacement reduced and the stability of embankment enhanced when expressway widened engineering reinforced with geotextile. It also can be found that the axial force of geotextile get its maximal value at the intersection of old and new part of embankment, which is controlled by the differential settlement and normal stress mainly. In order to reinforce the embankment effectively, it is advised that the geotextile should be paved on high-stress zone.

Numerical Analysis of Back Berm on Road Engineering with FEM

2013 ◽  
Vol 748 ◽  
pp. 1087-1090
Author(s):  
Jie Qun Liu ◽  
Dong Lin Wang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Numerical Analysis ◽  
Lateral Displacement ◽  
Critical Value ◽  
Nonlinear Finite Element ◽  
Nonlinear Finite Element Method ◽  
Road Engineering ◽  
The Stability ◽  
Element Method

Based on nonlinear finite element method (FEM), the effect of back berm has been systematically studied. It is found that the lateral displacement of embankment could be reduced by back berm effectively, and the stability of embankment increased rapidly with the width of back berm enlarged. There is a critical value of width of back berm, that the stability of embankment is no more increased with the width of back berm enlarged than critical value.

Influence of Concrete Pouring Sequence on Stability of Different Height High-Formwork Support System

2013 ◽  
Vol 838-841 ◽  
pp. 227-230
Author(s):  
Li Liu ◽  
Fang Wang ◽  
Ju Chao Wang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Support System ◽  
Lateral Displacement ◽  
Construction Process ◽  
Analysis Software ◽  
Element Analysis ◽  
The Stability

This article used ABAQUS finite element analysis software to established the high-formwork, analyzed effect on stability of the different height formwork by contrasting lateral displacement of various heights, discussed influence of concrete pouring sequence on stability of different height high-formwork support system in the construction process. From the simulated result, it can be seen that with the increase of height, the lateral displacement increased gradually when poured in dissymmetrical way, but the stability of high-formwork decreased, the result also provides evidence for code revision.

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