Finite Element Project

1
Finite Element Project

• Cound Arbour Bridge, 1797 (
  Shorpshire, England )
• Lecturer
  Yan Zhuge
• Prepared by Ho
  Tien Peng

2
Introduction

• Analysing Cound Arbour Bridge
• Constructed from cast iron
• Analysed using linear elastic, finite element
  analysis
• Analysis involved vehicular traffic load (UDL)
  and point load

3
Dimension

• Side view of the simplified structure

4
Dimension
5
Dimension of the bridge

• Plan view of the bridge

6
Properties

• Concrete slab (Plate)
• - thickness 0.15m
• - youngs modulus 3.429 x 104 MPa
• - poisson ratio 0.2
• Steel structure (Beam)
• - youngs modulus 2.0 x 105 MPa
• - iron arch 250UB25.7
• - steel truss 200UB29.8
• - poisson ratio 0.25

7
Modelling

• Prepared coordinates (x, y, z) for the nodes of
  the half section bridge.
• Connected all the nodes.
• Mirrored the half section to obtain a complete
  model.
• Applied appropriate elements (plate/beam)
• Checked for nodes connection, missing nodes, and
  other faults.

8
Analysis

• Determine whether the arches were needed for the
  bridge or not.
• Behaviour of the bridge such as displacement,
  bending and shear.
• The condition of the bridge by applying different
  load case at the midspan.

9
ResultsDisplacement
10
Displacement ( without lower arch )
11
Maximum Shearing
12
Axial stress
13
Bending moment
14
Bending Moment
15
Shear Force
16
Shear force
17
Load case 2 Displacement when applying 350kN
of point load at the midspan.
18
Axial stress
19
Bending moment
20
Conclusion

• The iron arches supported the bridge by giving
  extra strength.
• The bridge had sufficient strength for vehicular
  use.
• It was able to be used by huge trucks with
  maximum loadings. (350kN)

21
Difficulties

• Finding appropriate bridge properties as it was
  built in 1797
• Assuming live load of standard fatique vehicular.
• Strand7
• - offsetting arches from one same node
• - solving and getting appropriate results

22

• Thank you for listening..