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GMSV in SEISM Project. Jonathan P. Stewart University of California, Los Angeles. Outline. Possible areas of activity: Geotechnical validation – duration sensitive Not at top of list in validation gauntlet General validation / use of simulations Fundamental to the validation gauntlet. - PowerPoint PPT Presentation
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GMSV in SEISM Project
Jonathan P. StewartUniversity of California, Los Angeles
Outline
Possible areas of activity:• Geotechnical validation – duration sensitive– Not at top of list in validation gauntlet
• General validation / use of simulations– Fundamental to the validation gauntlet
Geotechnical Validation
• Site responseV s
InputRock Att.
G/GMax
D
g
Output
Equivalent-linear
Nonlinear
Geotechnical Validation
• Site response
Outcome:
Geotechnical Validation
• Site response• Nonlinear soil response
Element response:
Boulanger and Idriss, 2004
Fig. 23: Undrained Cyclic Simple Shear Test on Monterey #30/0 Sand (Test No. Ms15j)Dr=50%, v,i’=85 kPa, CSR=0.22 , =0
Fig. 24: Undrained Cyclic Simple Shear Test on Monterey #30/0 Sand (Test No. Ms30j)Dr=75%, v,i’=85 kPa, CSR=0.4 , =0
-0.3
-0.2
-0.1
0.0
0.1
0.2
0.30 0.2 0.4 0.6 0.8 1
Nor
m. S
hear
Stre
ss, (
/c )
Normalized Effective Vertical Stress, 'v/
c'
-0.3
-0.2
-0.1
0.0
0.1
0.2
0.3-10 -5 0 5 10
Shear Strain, g (%)
0
5
10
15
20
25
30
35
00.20.40.60.81
Excess Pore Pressure Ratio, ru (%)
Num
ber o
f Cyc
les
0
5
10
15
20
25
30
35
-10 -5 0 5 10
Shear Strain, g (%)
-0.4
-0.2
0.0
0.2
0.4
0 0.2 0.4 0.6 0.8 1
Nor
m. S
hear
Stre
ss, (
/c )
Normalized Effective Vertical Stress, 'v/
c'
-0.4
-0.2
0.0
0.2
0.4
-10 -5 0 5 10
Shear Strain, g (%)
0
5
10
15
20
25
30
00.20.40.60.81
Excess Pore Pressure Ratio, ru (%)
Num
ber o
f Cyc
les
0
5
10
15
20
25
30
-10 -5 0 5 10
Shear Strain, g (%)
Candidate metrics:
End of record pore pressure generation
Peak shear strain
Kammerer et al. (2002)
Candidate metrics:
End of record pore pressure generation
Peak shear strain
Post (or during) cyclic volume change
Yee et al. (2012).
Geotechnical Validation
• Site response• Nonlinear soil response• Newmark displacements
Newmark sliding block:
Geotechnical Validation
• Compute geotechnical engineering demand parameters (EDPs) of interest using recorded and simulated ground motion suites.
• OpenSees platform can be used
• Identify inconsistencies and their cause
General Validation / Use of Simulations
• Distance scaling; M-scaling• Spectral shape• Sigma from simulations (within- and between-
event)• Basin effects• Useful for: – Simulation validation– Constraining components of GMPEs poorly
constrained by data
Suggestion was to do geotechnical. My second suggestion is NGA-West3, so premature to do now.
Do it for the motions that pass the SWUS broadband validation project for the xx events. Select a series of simulated records and comparable real records and compare.
Some discussion of how do we compare apples and apples.
Could start by computing IMs for the sets that are relevant (CAV5, IA, duration, etc.). Could then compare sim/real for records with similar values of these Ims.
Coordinate with CG on this.
