scholarly journals A SIMPLIFIED CALCULATION METHOD FOR SYMMETRICAL LOADING OF A SINGLE-SPAN COMPOSITE STRING STEEL STRUCTURE

2019 ◽  
Vol 11 (2) ◽  
pp. 70-73
Author(s):  
Edmundas Beivydas
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Calculation Method ◽  
Shear Force ◽  
Steel Structure ◽  
The Finite Element Method ◽  
Concentrated Loads ◽  
String Structure ◽  
Symmetrical Loading ◽  
Simplified Calculation

The article presents single-span composite string steel structure. The article discusses the calculation method for the single-span composite string structure when the load is symmetrical, while the string and bottom cable act as absolutely flexible elements. It presents the way the displacements and the shear force in the supports are calculated for the distributed and concentrated loads. Calculations with a pre-tensioned string are provided. The results are compared with the results obtained with the finite element method program. The conclusions present the results obtained.

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.

scholarly journals Strength Analysis of a Steel Structure of Weights Boxes by Means of Simulation Computations

2017 ◽  
Vol 8 (1) ◽  
pp. 11-19
Author(s):  
Miroslav Blatnický ◽  
Ján Dižo ◽  
Stasys Steišūnas
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Total Mass ◽  
Mass Measurement ◽  
Steel Structure ◽  
Theory Of Elasticity ◽  
The Other ◽  
Strength Analysis ◽  
The Finite Element Method ◽  
Welded Steel

Abstract In this article the strength analyses of weights boxes are presented. Boxes are designed as a welded steel structure at which weights with total mass almost ten tons are stored in them. These boxes are an integral part of a mechanism intended for calibration of the mass measurement device. The article contains on one hand the basic scope of the theory of elasticity and strength analysis and on the other hand the numerical computations of the structure by using the Finite Element Method. Based on results the structure of weights boxes was modified in order to satisfy the defined safety factor.

scholarly journals Justification of the Calculation Method for Arch Support with Rock Grouting

2019 ◽  
Vol 105 ◽  
pp. 01026
Author(s):  
Victor Tatsienko ◽  
Vyacheslav Gogolin ◽  
Inna Ermakova ◽  
Alexander Liskovets
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Rock Mass ◽  
Bearing Capacity ◽  
Rock Pressure ◽  
Calculation Method ◽  
The Finite Element Method ◽  
Reduced Dimensions ◽  
Ring Support ◽  
Arch Support

This paper proposes a new method for calculating arch support with grouted space behind the support. The analysis of existing installations and methods for the calculation of frame supports was made. It has been established that the existing methods of frame parts calculation do not take into account the presence of grouted space behind the support. It is proposed to take into account the presence of the grouted layer in the space behind the support when it interacts with the rock mass. The formation of partially disturbed rock adjacent to the grouted layer is taken into account in the behaviour of rocks. In this method, the arch support is replaced with a ring support. The finite element method establishes the reduced dimensions of the ring support and its module of linear deformations, corresponding to these values of the arch support when its bearing capacity is lost. The scheme for calculating arch support ultimately boils down to considering the interaction of the support, the grouted layer, the zone of partially destroyed rocks and the rest of the mass of intact rocks in the hydrostatic field of rock pressure.

Simplified Calculation Method of Planar Coil Impedance Considering the Eddy Current Distribution by Using Finite Element Method

2014 ◽  
Vol 792 ◽  
pp. 215-220 ◽  
Author(s):  
Hiroyuki Wakiwaka ◽  
Daisuke Ito ◽  
Kunihisa Tashiro ◽  
Hisashi Yajima ◽  
Yuji Manta ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Eddy Current ◽  
Calculation Method ◽  
Metal Plate ◽  
Current Sensor ◽  
Planar Coil ◽  
Simplified Calculation ◽  
Element Method ◽  
Simplified Calculation Method

Eddy current sensors have various uses. However, there are few studies which show theinfluence of a conductor on the impedance of a detector coil using theoretical formulae. This papershows a simplified calculation method for impedance of a planar coil while considering the influenceof eddy current. An eddy current distribution in a metal plate facing to planar coil was calculatedusing finite element method. It assumed the metal plate to be a one-turn coil that can change shape.Therefore, the impedance of a planar coil considering the influence of the eddy current can beestimated from an equivalent circuit. In addition, calculations were simplified by estimating mutualinductance between the planar coil and the metal plate from an area ratio. This simplified calculationmethod can estimate impedance with the same accuracy as finite element method. The calculatedvalue agrees to within ±2.44 % of the measured value. The computation time was shortened by 1/20.Therefore, it can be immediately estimated how each parameter of a planar coil or a target influencesthe characteristic of the eddy current sensor. This simplified calculation method is useful for anoptimum design of an eddy current sensor.

scholarly journals ANALISIS STABILITAS TIMBUNAN DI ATAS KONSTRUKSI TIANG DAN GEOSINTETIK MENGGUNAKAN PROGRAM ELEMEN HINGGA

2020 ◽  
Vol 3 (3) ◽  
pp. 809
Author(s):  
Yosia Firmansyah ◽  
Andryan Suhendra
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Tensile Strength ◽  
Calculation Method ◽  
Soft Soil ◽  
Soil Characteristics ◽  
The Finite Element Method ◽  
Accurate Analysis ◽  
3D Software ◽  
Element Method

soft soil is a challenge for geotechnical engineer due to  the characteristics of the soil that cause over settlement. Geosynthetic reinforcement is used on piles to correct undesirable soft soil characteristics. This thesis will use the BS 8006 methods and 3D software that use the finite element method to compare the geosynthetic tensile strength and how geosynthetic influences the embankment. The author will use the 3D software in the hope that it will produce a more accurate analysis compared to the 2D software. This thesis will compare the calculation of the geosynthetic tensile strength with the finite element method and the BS 8006 method. This is done because the calculation method BS 8006 does not take into account the subgrade in analyzing the geosynthetic tensile strength. This geosynthetic material has been proven to reduce slippage and channel load to the pile. This reinforcement of poles and geocyntetics can increase embankment safety factor by at least 0.35. 

Simplified Calculation of Pylon Top Displacement of Multi-Pylon Suspension Bridge

2019 ◽  
Vol 2673 (10) ◽  
pp. 814-825
Author(s):  
Jinquan Zhang ◽  
Pengfei Li ◽  
Wanheng Li ◽  
Yan Mao ◽  
Zhenhua Dong
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Model Experiment ◽  
Suspension Bridge ◽  
Suspension Bridges ◽  
The Finite Element Method ◽  
Bridge Testing ◽  
Simplified Calculation ◽  
Simplified Formula ◽  
Element Method

The long-span multi-pylon suspension bridge is the subject of growing interest. Under live load, the longitudinal deflection of the mid-pylon is an important control parameter for a multi-pylon suspension bridge design. It is important to establish a simplified method of calculating pylon deflection for the preliminary design and selection of a multi-pylon suspension bridge. Based on deflection theory and deformation compatibility condition, considering main cable horizontal constraints and the interaction among pylons and girders with the methods of equivalent stiffness and moment distribution, the simplified calculation formulas of pylon displacement at the top for three-, four-, and five-pylon suspension bridges are derived. The validity of the formulas are verified by model experiment, real bridge testing, and finite-element analysis. For a floating system, the error between the simplified formula and the finite element method is less than 10%, and that of the model experiment is within 25%. For a consolidation system, the error between the simplified formula and the finite element method is within 16%, and that of the real bridge testing is less than 11%. As the number of pylons increases, the simplified formulas tend to be less accurate.

Method for calculating the load capacity of a cycloidal gear reducer with plastic satellites

2020 ◽  
pp. 15-20
Author(s):  
A.S. Ivanov ◽  
M.M. Ermolaev ◽  
A.V. Chirkin
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Calculation Method ◽  
Load Capacity ◽  
System Of Equations ◽  
The Finite Element Method ◽  
Crank Mechanism ◽  
Elastic Characteristics ◽  
Element Method

A method for calculating the load capacity of cycloidal gear reducers with a parallel crank mechanism is described, taking into account the elastic characteristics of the parts and the clearance in engagement. The calculation can also be used for cycloidal gear reducers of other types due to the use of the finite element method (FEM) and modifications of the system of equations used in the FEM. An example of calculating of a reducer with a satellite made of polyamide is given. Keywords cycloidal gear reducer, calculation method, finite element method, satellite from plastic. [email protected]

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