Finite Ele me nt Ana lysis o f Re a so na b le Fo und a tio n fo r Sup p o rting Silo ’ s To we r Sukima n Nurdin
279
3. Numerical Design
In this c ha p te r the d e sig n o f typ e s o f fo und a tio n in the p re vio us
c ha p te r will b e re vie we d a nd e xa m ine d using the finite e le m e nt
a p p ro a c h with the he lp o f a c o m p ute r p ro g ra m m e SAFE in O ASYS-
G EO 17.9. The inp ut a nd o utp ut p a ra m e te rs a re the sa m e a s the
p a ra m e te rs in the a na lytic a l d e sig n. A stud y a b o ut va ria tio n o f p a ra m e te rs
a nd c o nve rg e nc e stud y will b e p ro d uc e .
3.1 Pa d Fo und a tio n
Ta b le 10. Re sults o f the finite e le m e nt m o d e lling c o m p a re d to the a na lytic a l so lutio ns
Parameter Analytical
Result Numerical
Result Difference
FoS
1.97 1.25 57
Settlement
122 44 199
Pa ra m e tric Stud y:
•
Be a ring C a p a c ity Ta b le 11. Fa ilure lo a d fo r runs with d iffe re nt stre ng th
p ro p e rtie s o f the so il
c
u
kPa Failure Load
kNm2 FoS
Change in Bearing Capacity
40 204 q 206
1.05 -19.1
50 224 q 226
1.15 -8.6
60 243
q
245 1.25 0.0
70 261 q 263
1.34 +7.5
80 277 q 279
1.42 +13.7
•
Se ttle m e nt
100 200
300 400
500
250 500
750 1000
1250 1500
1750 2000
Loa d
k N
m
Settlement mm
Cu=80 Cu=70
Cu=60
Fig ure 4. Se ttle m e nt ve rsus inc re m e nta l lo a d ing fo r inc re a sing so il stre ng th.
Jurna l SMARTe k, Vo l. 9 No . 4. No p e m b e r 2011: 271 - 286
280
100 200
300 400
500
250 500
750 1000
1250 1500
1750 2000
Lo a
d k
N m
Settlement mm
Cu=40 Cu=50
Cu=60
Fig ure 5. Se ttle m e nt ve rsus inc re m e nta l lo a d ing fo r d e c re a sing so il stre ng th
3.2 Strip Fo und a tio n Ta b le 12. Re sults o f the finite e le m e nt m o d e lling
c o m p a re d to the a na lytic a l so lutio ns
Parameter Analytical
Result Numerical
Result Difference
Fo S 4.2 2.6 61.5 Se ttle m e nt 137m m
98m m 40.0
Pa ra m e tric Stud y:
•
Be a ring C a p a c ity Ta b le 13. Fa ilure lo a d fo r runs with d iffe re nt stre ng th
p ro p e rtie s o f the so il
Cu kPa Failure Load
kNm2 FoS Change
In FoS
40 172 q 174
2.05 -21.7
50 186 q 188
2.37 -9.5
60 203
q
205 2.62 0.0
70 222 q 224
2.82 +7.8
80 246 q 248
3.03 +15.7
Finite Ele me nt Ana lysis o f Re a so na b le Fo und a tio n fo r Sup p o rting Silo ’ s To we r Sukima n Nurdin
281
•
Se ttle m e nt
50 100
150 200
250 300
250 500
750 1000
1250 1500
1750 2000
Loa d
k N
m
Settlement mm
Cu=80 Cu=70
Cu=60
Fig ure 6. Se ttle m e nt ve rsus inc re m e nta l lo a d ing fo r d e c re a sing so il stre ng th.
50 100
150 200
250 300
250 500
750 1000
1250 1500
1750 2000
Loa d k
N m
Settlement mm
Cu=40 Cu=50
Cu=60
Fig ure 7. Se ttle m e nt ve rsus inc re m e nta l lo a d ing fo r d e c re a sing so il stre ng th.
3.3 Pile Fo und a tio n Ta b le 14.
Re sults o f the finite e le m e nt m o d e lling c o m p a re d to the a na lytic a l so lutio ns
Parameter Analytical
Result Numerical
Result Difference
Fo S 2.73 1.75 56 Se ttle m e nt
21m m 19.1m m 10
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282 Pa ra m e tric Stud y:
•
Be a ring C a p a c ity Ta b le 15.
Fa ilure lo a d fo r runs with d iffe re nt stre ng th p ro p e rtie s o f the so il
Cu kPa Failure Load
kNm2 FoS
Change in Bearing Capacity
40 178 q 180
1.53 -14.5
50 191 q 193
1.64 -6.6
60 201
q
203 1.75 0.0
70 208 q 210
1.78 +1.8
80 220 q 222
1.89 +8.0
•
Se ttle m e nt
50 100
150 200
250 300
350
500 1000
1500 2000
2500 3000
3500 4000
Lo a
d k
N m
Settlement mm
Cu=80 Cu=70
Cu=60
Fig ure 8. Se ttle m e nt ve rsus inc re m e nta l lo a d ing fo r
inc re a sing so il stre ng th.
50 100
150 200
250 300
350
500 1000
1500 2000
2500 3000
3500 4000
Loa d
k N
m
Settlement mm
Cu=40 Cu=50
Cu=60
Fig ure 9. Se ttle m e nt ve rsus inc re m e nta l lo a d ing fo r
d e c re a sing so il stre ng th.
Finite Ele me nt Ana lysis o f Re a so na b le Fo und a tio n fo r Sup p o rting Silo ’ s To we r Sukima n Nurdin
283
4. Discussion
