numerical simulations of liquefaction phenomena after emilia romagna (20 may 2012) earthquake
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Numerical simulations of liquefaction
phenomena after Emilia Romagna
(20 May 2012) earthquake
D. Forcellini, S. Gobbi and G. Guerra
Università di San Marino
davforc@omniway.sm
OPENSEES PL
INCOHERENT SOILS
INCOHERENT SOILS
COHESIVE SOILS
CASE STUDY
CASE STUDY
CASE STUDY
CASE STUDY
TRADITIONAL METHODS
TRADITIONAL METHODS(Youd and Perkins 1978)
CASE STUDY
CLAY MATERIALS
SAND MATERIALS
INPUT MOTION
-0.17-0.16-0.15-0.14-0.13-0.12-0.11-0.10-0.09-0.08-0.07-0.06-0.05-0.04-0.03-0.02-0.010.000.010.020.030.040.050.060.070.080.090.100.110.120.130.140.150.16
0 2 4 6 8 10 12 14 16 18 20
Acc
ele
razi
on
e (g
)
t (s)
Accelerogramma L1
FEM DEFINITION
BOUNDARY CONDITIONS
FINITE ELEMENTS
CALIBRATION
(1558 nodes, 1224 elements) (1911 nodes, 1520 elements)(825 nodes, 616 elements)
CALIBRATION
0.0
10.0
20.0
30.0
40.0
50.0
60.0
70.0
80.0
90.0
100.0
0 2 4 6 8 10 12 14 16 18 20
EP
P (
kP
a)
t (s)
EPP (5.55 m)
Mesh 01 Mesh 03 Mesh 04
CALIBRATION
0.00
0.01
0.01
0.02
0.02
0.03
0.03
0.04
0.04
0.05
0.05
0 2 4 6 8 10 12 14 16 18 20
Top
. D
isp
l. (
m)
t (s)
TOP DISPLACEMENT
Mesh 01 Mesh 03 Mesh 04
0.00
10.00
20.00
30.00
40.00
50.00
60.00
70.00
80.00
90.00
100.00
0 5 10 15 20 25 30 35 40
EP
P (
kP
a)
t (s)
Excess Pore Pressure at 3.70 m
0.00
10.00
20.00
30.00
40.00
50.00
60.00
70.00
80.00
90.00
100.00
0 5 10 15 20 25 30 35 40
EP
P (
kP
a)
t (s)
Excess Pore Pressure at 5.55 m
0.00
10.00
20.00
30.00
40.00
50.00
60.00
70.00
80.00
90.00
100.00
0 5 10 15 20 25 30 35 40
EP
P (
kP
a)
t (s)
Excess Pore Pressure at 7.40 m
RESULTS
0.00
0.01
0.02
0.03
0.04
0.05
0 5 10 15 20 25 30 35 40
Late
ral D
isp
lace
me
nt
(m)
t (s)
Top Lateral Displacement
0.00
0.01
0.02
0.03
0.04
0.05
0 5 10 15 20 25 30 35 40
Late
ral D
isp
lace
me
nt
(m)
t (s)
Lateral Displacement at 3.70 m
0.00
0.01
0.02
0.03
0.04
0.05
0 5 10 15 20 25 30 35 40
Late
ral D
isp
lace
me
nt
(m)
t (s)
Lateral Displacement at 5.55 m
0.00
0.01
0.02
0.03
0.04
0.05
0 5 10 15 20 25 30 35 40
Late
ral D
isp
lace
me
nt
(m)
t (s)
Lateral Displacement at 7.40 m
RESULTS
RESULTS
RESULTS
(scale 1:150)
SSI STUDIES
(future research)
CYCLIC TP
RESULTS
(scale 1:10)
REFERENCE
THANK YOU!davforc@omniway.sm
D. Forcellini, S. Gobbi and G. Guerra
Università di San Marino
davforc@omniway.sm
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