REVIEW: Nam Il Kim (2013)

Summary

Objective: damage detection
Test case: Truss 2D and 3D, elastic support
Method:

• Force / Flexibility method
• Singular value decomposition (svd)
• Micro genetic algorithms (MG) (Khrishnakumar, 1989)

How

• use dummy members to replace elastic support
• svd -> ?
• SAP 2000 to verify the calculation of force method
• MGA against displacement method
• compare computational time

Parameters

• max-gen = 500
• population = 500
• Xover = 1.0
• mutation - no

Result

• accurately verified by SAP 2000 to solve internal force and displacement
• MGA coverge, good prediction
• faster than displaement method in terms of computational time

So what?

• used this structure to test with CCGA, good example for spatial truss

Tested with Matlab using displacement method

These results are different from the paper…

Displacement 2D
         0         0         0
    0.0862   -4.7665         0
    0.9556   -7.7125         0
    1.5537   -6.7029         0
    3.6965   -0.3020         0
    3.3944   -4.5874         0
    2.4280   -8.4692         0
    1.9139   -7.2169         0

Displacement 3D
    5.4107    5.4107   -0.3576
    4.0803    3.5069   -0.1693
    3.8293    3.8293   -1.6373
    3.5069    4.0803   -0.1693
    2.2698    2.2698    0.8667
    2.8820    1.9586   -0.1201
    1.9545    1.9545   -1.2394
    1.9586    2.8820   -0.1201
    1.4568    1.4568    0.9715
         0         0         0
         0         0         0
         0         0         0