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Monticello Blind Prediction WorkshopUSSD EARTHQUAKES COMMITTEEAPRIL 2016
340-ft tall medium arch Earthquake recorded on May 22, 2015
Epicenter 16 km away from the dam
4.1M ground motion
Material Testing
Static Compression: 3080-5820 lb/in2
Dynamic Compression: 3640-5570 lb/in2
Static Direct Tension: 55-245 lb/in2
Static Split Tension: 260-425 lb/in2
Dynamic Split Tension: 230-595 lb/in2
Static Modulus of Elasticity: 4.12-7.18x106 lb/in2
Dynamic Modulus of Elasticity: 3.00-6.68x106 lb/in2
Eccentric Shaker Test
Ground Motion
Ground Motion Response Spectra
0
0.05
0.1
0.15
0.2
0.25
0.3
0.35
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
Acc
eler
atio
n (g
)
Period (seconds)
Response Spectrum
EW NS VERT
Prediction Assumptions
Upstream/Downstream Displacement Predictions
Cross-CanyonDisplacement Predictions
Upstream/Downstream Response Spectra
Cross-Canyon Response Spectra
Questions for Discussion Given the information provided, what is the ideal analysis
methodology? Multiple? What boundary conditions are appropriate? Could there have been considerable impacts of resonance on the
instrument? What model assumptions are subject to the greatest uncertainty in
this analysis? What other data or assumptions would have been needed to
improve the blind predictions? What conclusions can we draw from the presented responses for
future predictions of dam response? Do these predictions provide enough confidence to make decisions
informed by finite element analysis? How do we do better?