# Bridge analysis using Ansys mechanical Apdl. Solid mechanics assignment

## Submitted Assignment, 2014

Excerpt

Create and present FE model of the bridge

1.10 Creation of the Finite Element model
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Discuss real constants, material model and element type chosen for the FE analysis
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Justification of the element type selected

Present meshed FE model and discuss the procedures used for it
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Explain the boundary conditions used for the modal analysis
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Present your post processing results in textual and graphical form
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Discuss the solver used for this analysis

Refine the FE model with more elements and conduct analysis
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Presenting the post processing results in textual and graphical form for the no of element division of 100 for the refined analysis and compare it with the results of previous model.
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Table 1.1. Showing the comparison of the results gotten from the analysis

Discussion and Conclusion

References

### Create and present FE model of the bridge

(Discuss the procedure used as well)

In modelling this Finite Element model of this bridge, different system are to be used in other to solve the given problem and achieve the final result required. Different dimensions can be used to solve this problem such as 1-Dimensional (1D), 2-Dimensional (2D) and 3- Dimensional (3D) finite element can be ensured. In this particular work, the bridge is in form of a line making a 1-Dimensional analysis to be the most competent to be used in solving this problem. Different steps shown below is used to obtain the Finite Element model of the bridge.

### 1.10 Creation of the Finite Element model.

- Creating the Keypoints: In other to create this finite element model, several methods can be used but in this work of bridge creation, creation of keypoints is been used to create this model. The process is shown below on how the keypoints is been assigned in the X, Y and Z co-ordinates.

ANSYS Main Menu>>Preprocessor>>Modelling>>Create>>Keypoints>>In Active CS>>then put in the keypoint values as shown in the coordinates boxes>>Click Ok

Showing plotted keypoint coordinates

Keypoint No. 1

X coordinates - 0 µm

Y coordinates - 0 µm

Z coordinates – 0 µm

Keypoint No. 2

X coordinates - 200 µm

Y coordinates -0 µm

Z coordinates – 0 µm

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- Joining both lines: After the keypoints has been assigned, the two lines is been joined together to make the clamped-clamped bridge.

ANSYS Main Menu>>Preprocessor>>Modelling>>Create>>Lines>>Straight Lines>>Click on the Keypoint 1 and 2>>Click Ok

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### Discuss real constants, material model and element type chosen for the FE analysis

First for the creation of this model the structural type is been selected from the Preference because resonant frequencies and mode shapes of the clamped-clamped bridge are to be extracted and presented.

ANSYS Main Menu>>Preference>>Click on Structural in the Box and Click Ok

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- Element type: In this analysis, the 3 node 189 was chosen as the element type because the beam 3 has a uniaxial element with tensions, compressions and bending capabilities. In each node of the element is also a DOF of 3 Dimension which translates on x and y nodal direction and rotates about z nodal axis.

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- Adding the Sections: After which the section will be added under Breadth which is 25µm and Height which is 0.6µm for the area section of the clamped-clamped bridge.

ANSYS Main Menu>>Preprocessor>>Section>>Beam>>Common Section>>Add the B and H to the values assigned>>Click Ok

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- Material Model: The Structural, Linear, Elastic and Isentropic are chosen respective in other to assign the material model. The material properties are the Modulus of elasticity which is 170e9 and the Poisson’s ratio which is o.270.

ANSYS Main Menu>>Preprocessor>>Material Props>>Material Model>>Structural>>Linear>>Elastic>>Under Ex put 170e9 and under PRXY put 0.270>>Click Ok>> Click Density>>Density dialogue box appear>>put 3000Kj/m for the Density and Close.

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Excerpt out of 38 pages

Details

Title
Bridge analysis using Ansys mechanical Apdl. Solid mechanics assignment
College
Coventry University
A
Author
Year
2014
Pages
38
Catalog Number
V976471
ISBN (eBook)
9783346353108
Language
English
Tags
bridge, ansys, apdl, solid
Quote paper
Orakwelu Nzube Cliff (Author), 2014, Bridge analysis using Ansys mechanical Apdl. Solid mechanics assignment, Munich, GRIN Verlag, https://www.grin.com/document/976471 