694
Proceedings of the 18
th
International Conference on Soil Mechanics and Geotechnical Engineering, Paris 2013
5 CONCLUDIN
This paper discusse
rical solutions for seismic
dimensional wave equation
2006. EQWEAP~a Simplified Procedure to
raction with Soil Liquefaction
2
nd
Taiwan-Japan Joint Workshop on
Cha
Cha
Tok
Ch
Cha
G REMARKS
s the nume
Figure 10. Pile displacement time-history for No.4 case study
Table 3 Comparisons on tim required in various analyses
Figure 11. Pile displacement time-history for No.5 case study
e
EQWEAP
PLAXIS MIDAS/GTS
case
free field
node numbers
14
≒
1600
≒
2000
time
≒
3 min
≒
15 min
≒
60 min
time ratio
≒
1
：
5
：
12
case
piles
node numbers
11
≒
6000
≒
5500
time
≒
5 min
≒
45 min
≒
150 min
time ratio
≒
1
：
9
：
30
platform
CPU
RAM
OS
AM
3.00 GHz
4.00GB
Windows 7
D X2 250
responses of the piles from one-
analysis EQWEAP with those from two- and three-dimensional
finite element analyses using PLAXIS and MIDAS GTS
programs. Linear and nonlinear solutions were both checked
for a homogeneous soil system, whereas the nonlinear
solutions were verified for the interlayer system. It was
concluded that the solutions from these analyses are agreeable
at a variety of seismic intensities. In addition, the pile
displacements were found nearly independent with the seismic
excitations at other directions. Therefore it is concluded that
the one-dimensional analysis can provide rational solutions to
the seismic responses of the piles while it requires much less
time for computations.
6 REFERENCES
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50
-50
0
D40_GP_Ground0m
EQWEAP
PLAXIS
MIDAS
PGA=0.12g
-50
0
Displacement (cm)
50
D40_GP_Ground -15m
EQWEAP
PLAXIS
MIDAS
PGA=0.12g
0
10
20
30
40
50
6
Time (s)
0
50
-50
0
D40_GP_Ground -30m
EQWEAP
PLAXIS
MIDAS
PGA=0.12g
150
-150
-75
0
75
921chichi earthquake
D70_921_Ground 0m
Case1EW
Case2EW+U
Case3EW+NS
Case4EW+NS+U
-150
-75
0
75
Displacement (c
150
m)
921chichi earthquake
D70_921_Ground -30m
Case1EW
Case2EW+U
Case3EW+NS
Case4EW+NS+U
0
10
20
30
40
50
6
Time (s)
0
150
-150
-75
0
75
921chichi earthquake
D70_921_Ground -60m
Case1EW
Case2EW+U
Case3EW+NS
Case4EW+NS+U
