Computer Applications In Civil Engineering CIVE3002

1
Computer Applications In Civil Engineering
(CIVE3002)

• Finite Element Analysis Project
• Lecturer Dr. Yan Zhuge
• Presented By Wong Ing Seng
• Harry Ting Ken Hieng

C-Style Bunk Bed
2
Introduction
0.8 m

• Metal C-Style shape
• Built in ladder
• Hollow section

1.55 m
1.96 m
1.30 m
3
Objective

• Determine deformation shape under different load
  cases
• Analyse model maximum deflection
• Analyse model maximum stress

4
Model Layout

• Model
• 2759 Nodes
• 959 Beams
• 768 Plates
• Boundary Condition
• Constrained in X, Y, Z directions at two sides of
  frame supports

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Material Summary
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Assumption

• Adult and child weight 130kg
• Bunk bed dimension
• Material properties
• Plywood support by beam element
• Plywood thickness 6 mm
• Plywood density 500 kg/m3
• Live load applied on entire bed

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Materials Properties

• Plate strength
• Stress Grade F7 with 12 MC
• Bending 20 MPa
• Tension 12 MPa
• Beam element yield stress
• CHS 250 MPa
• RHS 350 MPa

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Load Cases
4.
5.

• Model self weight
• Bed textiles self weight
• Live load over entire plate
• Concentrate live load at critical location
• Horizontal live load
• Combination Case 1 12
• Combination Case 2 12 3
• Combination Case 3 12 4
• Combination Case 4 12 5

4.
Result Next!
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Results
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ResultsCombination Case 2
Max. Beam Displacement 6.30mm Max. Plate
Displacement 10.03mm
Max. Fibre Stress 210.72MPa Max. Plate Stress
4.79MPa
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ResultsCombination Case 3
Max. Fibre Stress 252.24MPa Max. Plate Stress
11.41MPa
Max. Beam Displacement 8.86mm Max. Plate
Displacement 11.01mm
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ResultsCombination Case 4
Max. Fibre Stress 92.81MPa Max. Plate Stress
0.57MPa
Max. Beam Displacement 2.41mm Max. Plate
Displacement 1.90mm
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Results Model cross section
Max. Fibre Stress 92.81MPa Max. Plate Stress
0.57MPa
Max. Beam Displacement 2.41mm Max. Plate
Displacement 1.90mm
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Results Deformation shape
Max. Fibre Stress 92.81MPa Max. Plate Stress
0.57MPa
Max. Beam Displacement 2.41mm Max. Plate
Displacement 1.90mm
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Results Combination Case 2 (Redesign)
Max. Fibre Stress 221.07MPa Max. Plate Stress
0.63MPa
Max. Beam Displacement 8.84mm Max. Plate
Displacement 10.26mm
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ResultsCombination Case 3 (Redesign)
Max. Fibre Stress 317.86MPa Max. Plate Stress
0.60MPa
Max. Beam Displacement 11.39mm Max. Plate
Displacement 11.60mm
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ResultsCombination Case 4 (Redesign)
Max. Fibre Stress 132.86MPa Max. Plate Stress
0.63MPa
Max. Beam Displacement 2.52mm Max. Plate
Displacement 2.40mm
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Results Model cross section
Max. Fibre Stress 132.86MPa Max. Plate Stress
0.63MPa
Max. Beam Displacement 2.52mm Max. Plate
Displacement 2.40mm
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Results - Redesign Model
Max. Fibre Stress 132.86MPa Max. Plate Stress
0.63MPa
Max. Beam Displacement 2.52mm Max. Plate
Displacement 2.40mm
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Conclusion

• Original model
• Max. Displacement 11 mm
• Max. Beam Stress 231.73 MPa FOS 1.08
• Max. Plate stress 11.41 MPa FOS 1.6
• Redesign model
• Max. Displacement 11.6 mm
• Max. Beam Stress 317.86MPa gt 250MPa Fail
• Both model pass for Combination case 2.
• Redesign model top level CHS fail in Combination
  case 3.

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• THE END

THE END
Thank You For Your Attention!