scholarly journals Three-dimensional Modeling of an Old Masonry Bridge and Assessing Its Current Capacity

2020 ◽  
Author(s):  
Saeed Sotoudeh ◽  
Meysam Jahangiri ◽  
Masoud Ranjbarnia ◽  
Jabbar-Ali Zakeri
Keyword(s):  
Axial Load ◽  
Three Dimensional ◽  
Travel Speed ◽  
Masonry Arch ◽  
The Road ◽  
Three Dimensional Modeling ◽  
Dimensional Finite Element ◽  
Depth Study ◽  
Train Speed ◽  
Three Dimensional Finite Element

Masonry bridges are among the main structures built along the road and railway routes. These structures are generally old and have historical value. Considering the increased axial load and passing speed from these bridges, an in-depth study of these structures and their potential is of paramount importance. In the present study, an old masonry arch bridge located in 475 km of Western Iranian railway is investigated. For the detailed modeling of this structure, a three-dimensional finite element method (3DFEM) was implemented to take into account the details of the bridge and the train passing over it. The developed model was calibrated and validated using the dynamic field test results. The obtained results showed that the increase in the axial load and train speed over the bridge must be done carefully because exceeding the travel speed of 90 km/h and increasing the axial load from 20 to 30 ton makes serious problems in the bridge and interrupts its performance. Furthermore, it was found that the adequacy factor of the bridge under the standard load of LM71 is over 2.

Three Dimensional Dynamic Analyses on Stroller Wheel with Shock Absorber

2013 ◽  
Vol 387 ◽  
pp. 159-163
Author(s):  
Yi Chern Hsieh ◽  
Minh Hai Doan ◽  
Chen Tai Chang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Three Dimensional ◽  
Adaptive Finite Element Method ◽  
Adaptive Finite Element ◽  
The Road ◽  
Dimensional Finite Element ◽  
On The Road ◽  
Three Dimensional Finite Element ◽  
Element Method

We present the analyses of dynamics behaviors on a stroller wheel by three dimensional finite element method. The vibration of the wheel system causes by two different type barriers on the road as an experiment design to mimic the real road conditions. In addition to experiment analysis, we use two different packages to numerically simulate the wheel system dynamics activities. Some of the simulation results have good agreement with the experimental data in this research. Other interesting data will be measured and analyzed by us for future study and we will investigate them by using adaptive finite element method for increasing the precision of the computation results.

Viscoelastic Analysis on High Temperature’s Stability of Asphalt Pavement

2009 ◽  
Vol 620-622 ◽  
pp. 719-722
Author(s):  
Hong Wang ◽  
Shao Peng Wu ◽  
Ling Pang
Keyword(s):  
High Temperature ◽  
Mechanical Performance ◽  
Asphalt Pavement ◽  
Permanent Deformation ◽  
Asphalt Mixture ◽  
Three Dimensional ◽  
The Road ◽  
Environment Temperature ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element

Flexible pavement-asphalt mixture plays an important role in structures of the primary road and bridge at present. However, the mixture is a type of viscoelstic material and is sensitive to environment temperature, especially a high temperature. The permanent deformation due to high temperature and the material’s viscoelastic shorten the service life of the road and even lead to traffic accident. Therefore it is necessary to analyze the pavement’s mechanical performance. In the study, the viscoelastic constitutive equation of the mixture is transformed to Prony Series. The objective of this study is to characterize the stability of asphalt pavement at high temperatures with a three-dimensional finite element and accurately predict the pavement’s strain and stress in vehicle load.

Experimental and numerical investigations of the dynamic responses of an asymmetrical arch railway bridge

2018 ◽  
Vol 232 (9) ◽  
pp. 2309-2323 ◽  
Author(s):  
Hongye Gou ◽  
Yannian He ◽  
Wen Zhou ◽  
Yi Bao ◽  
Genda Chen
Keyword(s):  
Ride Comfort ◽  
Three Dimensional ◽  
Element Model ◽  
Dynamic Responses ◽  
Dynamic Strain ◽  
Railway Bridge ◽  
Coupling System ◽  
Dimensional Finite Element ◽  
Train Speed ◽  
Three Dimensional Finite Element

The dynamic responses of an asymmetrical arch railway bridge subjected to moving trains are experimentally and numerically investigated in this study. The strains, displacements and accelerations at critical sections of the bridge were measured at different speeds of trains. A three-dimensional finite element model of the bridge–vehicle coupling system was established to understand the measured dynamic responses and was validated against the experimental results. The numerical model was used to analyze the influence of asymmetry on the dynamic responses of the bridge and the safety and ride comfort of trains. The results indicate that the dynamic responses of the bridge increase with the train speed. Braking of the train has the largest impact on the vertical dynamic displacement of the bridge. The maximum dynamic strain is in the arch rib. The longer half arch demonstrated much larger counterforce and dynamic responses than those of the shorter half arch, while the symmetrical structures tend to exhibit good symmetry. The asymmetrical arrangement of the bridge reduces the structural stiffness.

Modeling and Simulation of Airflow Omnibearing Posture Sensor

2014 ◽  
Vol 889-890 ◽  
pp. 817-820
Author(s):  
Qi Rui Yang ◽  
Lin Hua Piao ◽  
Wen Jie Tian
Keyword(s):  
Finite Element Modelling ◽  
Three Dimensional ◽  
Ansys Software ◽  
Three Dimensional Modeling ◽  
Dimensional Modeling ◽  
Modelling Method ◽  
Dimensional Finite Element ◽  
Simulation Results ◽  
Three Dimensional Finite Element ◽  
Simulation Time

In order to improve the performance of sensor, Using ANSYS software, the three-dimensional finite element modelling method and simulation results of micromachined airflow omnibearing level posture sensor are presented. The results show that: (1)Using the sense organ’s symmetry characteristic, a half model is built first, which is convenient for modelling and observing the simulation results;(2) Gridding should be meshed more densely where fluid grads is large, which is helpful of saving simulation time and improving precision. Compared to two-dimensional modeling, the simulation results of three-dimensional modeling are more comprehensive and exact, which provides dependable basis for further research of the sensor.

Axial Load Behavior of Acomposite Wall Strengthened with an Embedded Octagon Cold-Formed Steel

2015 ◽  
Vol 754-755 ◽  
pp. 437-441 ◽  
Author(s):  
Salam Jasim Hilo ◽  
Wan Hamidon Wan Badaruzzaman ◽  
Siti Aminah Osman ◽  
Ahmed W. Al Zand
Keyword(s):  
Axial Load ◽  
Steel Sheet ◽  
Three Dimensional ◽  
Dimensional Finite Element ◽  
Cold Formed Steel ◽  
Composite Wall ◽  
Different Shapes ◽  
Three Dimensional Finite Element ◽  
Composite Walls ◽  
Load Behavior

This study investigates the axial load behavior of an existing composite wall consists of a double-skinned profiled steel sheet in-filled with normal concrete. Three different composite walls in three-dimensional finite element models were developed, i.e. profiled steel sheet (PSS), core concrete, and the full composite wall system. The models were simulated and compared with the experimental results published by other researchers. Studies are then carried out on different effect of varying the PSS thicknesses, an embedded octagon cold-formed steel (CFS) thickness, and an embedded octagon CFS supported by two stiffeners with different shapes. As a result, the ultimate axial load of the composite wall was increased by approximately 3.3% when PSS thickness changed from 0.8 mm to 1.0mm. Meanwhile, the ultimate axial load was also increased by 17% and 55% when an embedded octagon CFS with thicknesses of 0.8 mm and 1.0 mm were used. Lastly, the ultimate axial load was raised by 54% and 78% when an L-shaped and a T-shaped stiffener were added.

scholarly journals 3D simulations of deep mixed columns under road embankment

2021 ◽  
Vol 54 (1) ◽  
pp. 1-20
Author(s):  
Ayman Abed ◽  
Leena Korkiala-Tanttu ◽  
Juha Forsman ◽  
Kirsi Koivisto
Keyword(s):  
Ground Improvement ◽  
Three Dimensional ◽  
Traffic Load ◽  
Traffic Loading ◽  
Suitable Material ◽  
The Road ◽  
Dimensional Finite Element ◽  
On The Road ◽  
Three Dimensional Finite Element ◽  
Compression Resistance

When column stabilisation is meant to function as a ground improvement under an embankment, the design cases to be considered consist of overall stability, compression resistance of the column heads, arching of the embankment on the columns and settlements. This paper focuses on the compression resistance of the columns. The proper geotechnical design of deep mixed (deep stabilised) columns under road embankment requires good estimation of the stress-strain behaviour of the columns and the surrounding soil under the embankment and traffic loading. Earlier Finnish design approaches relied on an even traffic load of 10 kN/m2 on the road surface. The dimensioning methods for column stabilised soil are also based on the idea of an even traffic load. Due to Eurocode recommendations a more realistic scenario is introduced, which remarkably increases the magnitude of the traffic loading. After deriving suitable material properties and stiffness parameters for static and dynamic traffic loading, three-dimensional finite element calculations are performed to achieve better understanding of the mechanical interaction between the embankment, columns and soil under the new loading configuration. Even though more investigations are needed before delivering a final statement, the calculations show that, for the considered case in this paper, the new loading scenario has no relevant consequences on the design compared to the earlier design approach.

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.

Tire Modeling by Finite Elements

1992 ◽  
Vol 20 (1) ◽  
pp. 33-56 ◽  
Author(s):  
L. O. Faria ◽  
J. T. Oden ◽  
B. Yavari ◽  
W. W. Tworzydlo ◽  
J. M. Bass ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Rolling Contact ◽  
Test Problems ◽  
State Behavior ◽  
Normal Contact ◽  
New Developments ◽  
Applied Torque ◽  
Dimensional Finite Element ◽  
Tire Modeling ◽  
Three Dimensional Finite Element

Abstract Recent advances in the development of a general three-dimensional finite element methodology for modeling large deformation steady state behavior of tire structures is presented. The new developments outlined here include the extension of the material modeling capabilities to include viscoelastic materials and a generalization of the formulation of the rolling contact problem to include special nonlinear constraints. These constraints include normal contact load, applied torque, and constant pressure-volume. Several new test problems and examples of tire analysis are presented.

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