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# Numerical Simulations of Liquefaction Phenomena after Emilia Romagna (20 May 2012) Earthquake

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Presentation made by Dr Davide Forcellini @ University of Porto during the OpenSees Days Portugal 2014 workshop

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### Numerical Simulations of Liquefaction Phenomena after Emilia Romagna (20 May 2012) Earthquake

1. 1. D. Forcellini, S. Gobbi and G. Guerra Università di San Marino davforc@omniway.sm Numerical simulations of liquefaction phenomena after Emilia Romagna (20 May 2012) earthquake
2. 2. OPENSEES PL
3. 3. INCOHERENT SOILS
4. 4. INCOHERENT SOILS
5. 5. COHESIVE SOILS
6. 6. CASE STUDY
7. 7. CASE STUDY
8. 8. CASE STUDY
9. 9. CASE STUDY
11. 11. TRADITIONAL METHODS (Youd and Perkins 1978)
12. 12. CASE STUDY
13. 13. CLAY MATERIALS
14. 14. SAND MATERIALS
15. 15. INPUT MOTION 0.16 0.15 0.14 0.13 0.12 0.11 0.10 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0.00 -0.01 -0.02 -0.03 -0.04 -0.05 -0.06 -0.07 -0.08 -0.09 -0.10 -0.11 -0.12 -0.13 -0.14 -0.15 -0.16 -0.17 Accelerogramma L1 0 2 4 6 8 10 12 14 16 18 20 Accelerazione (g) t (s)
16. 16. FEM DEFINITION
17. 17. BOUNDARY CONDITIONS
18. 18. FINITE ELEMENTS
19. 19. CALIBRATION (1558 nodes, 1224 elements) (1911 nodes, (825 nodes, 616 elements) 1520 elements)
20. 20. CALIBRATION 100.0 90.0 80.0 70.0 60.0 50.0 40.0 30.0 20.0 10.0 0.0 EPP (5.55 m) 0 2 4 6 8 10 12 14 16 18 20 EPP (kPa) t (s) Mesh 01 Mesh 03 Mesh 04
21. 21. CALIBRATION 0.05 0.05 0.04 0.04 0.03 0.03 0.02 0.02 0.01 0.01 0.00 TOP DISPLACEMENT 0 2 4 6 8 10 12 14 16 18 20 Top. Displ. (m) t (s) Mesh 01 Mesh 03 Mesh 04
22. 22. 100.00 90.00 80.00 70.00 60.00 50.00 40.00 30.00 20.00 10.00 0.00 Excess Pore Pressure at 3.70 m 100.00 90.00 80.00 70.00 60.00 50.00 40.00 30.00 Excess Pore Pressure at 5.55 m 100.00 90.00 80.00 70.00 60.00 Excess Pore Pressure at 7.40 m 0 5 10 15 20 25 30 35 40 EPP (kPa) 50.00 t (s) 20.00 10.00 0.00 40.00 30.00 0 5 10 15 20 25 30 35 40 EPP (kPa) t (s) 20.00 10.00 0.00 0 5 10 15 20 25 30 35 40 EPP (kPa) t (s) RESULTS
23. 23. 0.05 0.04 0.03 0.02 0.01 0.00 Top Lateral Displacement 0.05 0.04 0.03 0.02 0.01 Lateral Displacement at 3.70 m 0.05 0.04 0.03 0.02 Lateral Displacement at 5.55 m 0.05 0.04 Lateral Displacement at 7.40 m 0 5 10 15 20 25 30 35 40 Lateral Displacement (m) t (s) 0.00 0.01 0.03 0.02 0 5 10 15 20 25 30 35 40 Lateral Displacement (m) t (s) 0.00 0.01 0 5 10 15 20 25 30 35 40 Lateral Displacement (m) t (s) 0.00 0 5 10 15 20 25 30 35 40 Lateral Displacement (m) t (s) RESULTS
24. 24. RESULTS
25. 25. RESULTS (scale 1:150)
26. 26. SSI STUDIES (future research)
27. 27. CYCLIC TP
28. 28. RESULTS (scale 1:10)
29. 29. REFERENCE
30. 30. D. Forcellini, S. Gobbi and G. Guerra Università di San Marino davforc@omniway.sm THANK YOU! davforc@omniway.sm