Influence of Rotational Stiffness on the Distribution of Horizontal Forces on All-Vertical-Pile-Supported Wharf Structures

2013 ◽  
Vol 405-408 ◽  
pp. 1453-1457
Author(s):  
Gui Lan Tao ◽  
Si Yuan Dong
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Calculation Method ◽  
Distribution Coefficients ◽  
Length Ratio ◽  
Force Distribution ◽  
Horizontal Force ◽  
Maximum Difference ◽  
Rotational Stiffness ◽  
Beam Method

A calculation method of rotational stiffness of all-vertical-pile-supported (AVPS) wharf is discussed and a formula based on rotational stiffness is derived to evaluate the distribution of horizontal forces on an AVPS wharf. Combining with an engineering example, the rotational stiffness and the horizontal force distribution coefficients were calculated utilizing finite element method (FEM), the elastic support-rigid beam method (ESRBM) outlined in Chinese Harbor Code, as well as the proposed formula for the piles layout width-length ratio of 0.4, 0.5 and 0.6. Results indicate that the increase in width-length ratio will increase the rotational stiffness and make the distribution of horizontal forces on each bent to be more uniform. Results calculated by the proposed formula are agree well with the results by FEM. The maximum difference of the distribution coefficient on the first bent between the results obtained by the proposed formula and by ESRBM is approximately 22%.

Finite Element Modeling of Electromagnetic Crimping of Cu-SS Tube-to-Tube Joint Along With Simulation of Destructive Testing for Strength Prediction of the Joint

2020 ◽  
Vol 143 (4) ◽  
Author(s):  
Deepak Kumar ◽  
Sachin D. Kore ◽  
Arup Nandy
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Compressive Strength ◽  
Element Model ◽  
Strength Prediction ◽  
Force Distribution ◽  
Radial Deformation ◽  
Destructive Testing ◽  
Pull Out ◽  
Element Method

Abstract This work explores the tube-to-tube joining of copper (outer) and stainless steel (inner) using electromagnetic crimping. Stand-off distance is kept constant during all the experiments. ls-dynaTM electromagnetic module, which utilizes finite element method combined with the boundary element method, is used to perform numerical simulations and the model is validated with experimentally observed thinning and radial deformation of the outer tube during electromagnetic crimping. Effect of slit of the field shaper on Lorentz force distribution is studied. It is observed that the slit of the field shaper leads to uneven radial deformation. Furthermore, a novel finite element model has been developed to predict the pull-out and compressive strength of the joint. Results are validated with the experimentally observed data.

Evaluation of ground loss ratio with moving trajectories induced in double-O-tube (DOT) tunnelling

2018 ◽  
Vol 55 (6) ◽  
pp. 894-902 ◽  
Author(s):  
Dong-Jie Ren ◽  
Shui-Long Shen ◽  
Arul Arulrajah ◽  
Huai-Na Wu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Calculation Method ◽  
Tunnel Construction ◽  
Loss Ratio ◽  
Ground Settlement ◽  
The Finite Element Method ◽  
Shield Tunnelling ◽  
Ground Loss ◽  
Shield Machine

This paper investigates the influence of moving trajectories on ground loss ratio (GRL) due to the double-O-tube (DOT) tunnelling method. DOT tunnelling has three moving trajectories: pitching, yawing, and rolling, which have different behaviours during tunnel construction compared with those from single circular shield tunnelling. These moving trajectories cause overexcavation during tunnelling. The calculation method of gap area between the DOT shield machine and linings is evaluated in this research. Based on the superposition concept, the modification equation of GLR is proposed, which takes both moving trajectory and grouting volume into consideration. A field DOT tunnelling case is analysed to determine the correlation between moving trajectories and ground settlement. The influence of tail grouting is discussed by adjusting the grouting volume in different periods. The finite element method is also employed by setting the modified ground loss ratio (GLR′) as the contraction increment of linings. Results from both the measured and simulated settlements verify the reasonability of the proposed equation and the effect of moving trajectories on ground loss.

LATERAL BUCKLING OF THE STRUTS IN BEAM STRING STRUCTURES CONSIDERING THE LAYOUT OF STRINGS

2012 ◽  
Vol 12 (03) ◽  
pp. 1250015 ◽  
Author(s):  
MINGER WU ◽  
KENICHI HIRAI
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Nonlinear Finite Element ◽  
Lateral Stiffness ◽  
Geometrically Nonlinear ◽  
Nonlinear Finite Element Method ◽  
Rotational Stiffness ◽  
Lateral Buckling ◽  
String Structure ◽  
Parametric Studies

The struts in a beam string structure (BSS) may buckle laterally under compression. The lateral buckling of the struts is determined not only by the rotational stiffness of the beam–strut joints and the length and bending stiffness of the struts, but also by the rise and lateral stiffness of the beam, the number of struts, and the layout of strings. In this paper, the multi-strut BSS with several types of layout of strings is studied. An analytical method for estimating the lateral buckling load of the struts in BSS is proposed. Parametric studies are carried out to investigate the variation of the lateral buckling of the struts in the BSS for different string layouts. In the end, the validity of the proposed method is examined by means of numerical simulations using the geometrically nonlinear finite element method.

scholarly journals Influence of Seismic Loading on Segment Opening of a Shield Tunnel

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Yang Chun-shan ◽  
Mo Hai-hong ◽  
Chen Jun-sheng ◽  
Wang Yi-zhao
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Calculation Method ◽  
Seismic Loading ◽  
Shield Tunnel ◽  
Seismic Action ◽  
One Dimensional ◽  
Dynamic Finite Element ◽  
Different Depths ◽  
Continuous Theory

The influence of seismic loading on segment opening of a shield tunnel was explored using the dynamic finite element method to analyze the distribution of segment opening under multidirectional seismic loading, combined with a typical engineering installation. The calculation of segment opening was deduced from equivalent continuous theory and segment opening was obtained through calculations. The results show that the scope of influence of the foundation excavation on segment opening is mainly resigned to within 5 segment rings next to the diaphragm wall and 4 joints nearest the working well when the tunnel is first excavated followed by the working well in the excavation order. The effect of seismic loading on segment opening is significant, and the minimum increase of the maximal segment opening owing to seismic loading is 16%, while that of the average opening is 27%. Segment opening under bidirectional coupled seismic loading is significantly greater than that under one-dimensional seismic loading. On the basis of the numerical calculations, the seismic acceleration and segment opening caused by seismic action were normalized, and a new calculation method was proposed for predicting the maximal segment opening of a shield tunnel at different depths under conditions of seismic loading.

The Method Analysis of Using Finite Element Method to Determine the Bemding Moment Formula of Precast Reinforced Concrete Composite Thermal Insulation of External Wall

2012 ◽  
Vol 204-208 ◽  
pp. 3682-3685
Author(s):  
Ying Wang ◽  
Yan E Sui
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Calculation Method ◽  
Engineering Application ◽  
Wall Panel ◽  
External Wall ◽  
Wall Panels ◽  
Sandwich Type ◽  
Method Analysis ◽  
Element Method

This paper describes the calculation method and steps of compound insulation external wall panels who's whole board with openings. Using Finite Element Method to simulate and analysis the result,For in the engineering application of the sandwich type wall panel provides the basis.

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