1. Earthquake competition
Workshop on analytical model

2. Analytical Model by using Computer Software
Error / Deviation from real behaviors comes from:
Imperfection of Idealization
Data Accuracy

3. Minimum Data Input for Structural Analysis
Geometry
Material
Section
Restraint
Load

4. 1. Geometry
1 bay x 1 bay (15 cm x 15cm)
9 stories cm)

5. 1. Geometry (define grids)

6. 1. Geometry (define grids)

7. 1. Geometry (draw frames)
Draw Quick Draw Frame

8. 2. Material (define) DefineMaterialAdd New Material Static & Dynamic

9. 3. Section (define) Define  Section Properties Frame Section
Add New Property  “Concrete” Rectangular

10. 3. Section (assign)
View  Set Display Option  View by Color of

11. 3. Section (assign)
Select all  Assign  Frame  Frame Section  “5mm”

12. 4. Restraint (assign)
Select “Foundation” Joints  Assign  Joint  Restraint

13. 5. Static Load
Draw “Platforms”  Steel, 5cm x 15cm x 3mm
“Extrude”

14. 5. Static Load (apply loads)
10 kN in x-direction on each platform centroid
Define  Load Pattern  Add Live Load

15. 5. Static Load (apply loads)
Select each platform centroid
Apply Frame Point “Live” Load in x direction

16. Run Analysis (F5) Display  Show Deformed Shape  Live Load
See U1 (x direction of a point)

17. Should Be Noted: With the same material, restraint, and load:
More “U1”  More Deflection  Less Stiffness  Weaker Structure
“Modify” Geometry & Section (see Competition rules)  to get “minimal” U1  make your Structure stronger
Aside of geometry & section design, each team may have variations of : joint strength, precision of construction (eccentric load !!!)

18. Static versus Dynamic Loads
In reality, the deflection =
U1 (static) x Dynamic Magnification Factor

19. 5b. Dynamic Load Define  Function  Time History  Sine
Adjust the input

20. 5b. Dynamic Load Delete the previous static load
Select all platform  Assign gravity Live Load

21. 5b. Dynamic Load
Define Mass Source  From Loads

22. 5b. Dynamic Load
Define  Load Cases  Add New

23. Run Analysis (F5)
View etc. & Envelope

24. Again:
“Modify” Geometry & Section (see Competition rules)  to get “minimal” U1  make your Structure stronger
Important (dynamic analysis):
Stiffer structure  does not automatically show less U1 (Resonance Effect  See video)
If the natural frequency of structure is far from that of the ground motion  no resonance effect, all logics are the same as static analysis