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6/25/20086/25/2008 11
Soil-Structure Interaction Soil-Structure Interaction Analysis of a Composite Analysis of a Composite
Structure on a Backfill HilltopStructure on a Backfill Hilltop WSRC-STI-2008-00269 Rev 0WSRC-STI-2008-00269 Rev 0
Lisa Anderson, Bechtel National, Inc.Lisa Anderson, Bechtel National, Inc.Jay Amin, Washington Savannah River Co.Jay Amin, Washington Savannah River Co.
June 25, 2008June 25, 2008
2008 GT STRUDL Users Group Meeting & Training Seminar
226/25/20086/25/2008
OverviewOverview
Scope of AnalysisScope of AnalysisBuilding DescriptionBuilding DescriptionAnalysis Analysis ConclusionsConclusions
6/25/20086/25/2008 33
Scope of AnalysisScope of Analysis
446/25/20086/25/2008
Scope of AnalysisScope of Analysis
Assess feasibility of adding new process to this Assess feasibility of adding new process to this complexcomplex Building complex constructed in 1980’sBuilding complex constructed in 1980’s Not designed to resist current seismic loads or wind Not designed to resist current seismic loads or wind
loadsloads Lateral load path is not well defined Lateral load path is not well defined
556/25/20086/25/2008
Scope of AnalysisScope of Analysis
Evaluate the structures forEvaluate the structures for Normal operating dead and live loadsNormal operating dead and live loads PC-3 seismic loads*PC-3 seismic loads* PC-2 wind loads*PC-2 wind loads*
administrative controls will stop process prior to tornado administrative controls will stop process prior to tornado events events
II/I concerns*II/I concerns*
*DOE Standard 1020*DOE Standard 1020
6/25/20086/25/2008 66
Building DescriptionBuilding Description
776/25/20086/25/2008
Building ComplexBuilding Complex
Split up for analysisSplit up for analysis Filter Cells and Hold Tank Room (Concrete)Filter Cells and Hold Tank Room (Concrete) Enclosure Building (Steel)Enclosure Building (Steel) Benzene Stripper Building (Composite)Benzene Stripper Building (Composite)
886/25/20086/25/2008
Building ComplexBuilding Complex
996/25/20086/25/2008
Building ComplexBuilding Complex
6/25/20086/25/2008 1010
AnalysisAnalysis
11116/25/20086/25/2008
Finite Element ModelsFinite Element Models
Create finite element models in GT STRUDL Create finite element models in GT STRUDL using a model builder programusing a model builder program Filter Cells and Hold Tank RoomFilter Cells and Hold Tank Room
Convert Filter Cells and Hold Tank Room to SASSI House Convert Filter Cells and Hold Tank Room to SASSI House ModelModelSTRUSASSISTRUSASSI
Enclosure BuildingEnclosure Building Benzene Stripper BuildingBenzene Stripper Building
12126/25/20086/25/2008
Filter Cells and Hold Tank RoomFilter Cells and Hold Tank Room
Filter CellsFilter Cells
Hold Tank RoomHold Tank Room
1:1 Mesh
except
column support
SBHQ6 Elements
13136/25/20086/25/2008
Enclosure BuildingEnclosure Building
X
Y
Z SUPPORT FX FY FZ MY FIXED JOINT
Hill
Grade
Filter Cells
Hold tank room
1
2
3
4
5
6
A
B
C
North
Crane Controll Room Wall
14146/25/20086/25/2008
Benzene Stripper BuildingBenzene Stripper Building
< 2:1 Mesh XYZCONCRETE MODELSBHQ6 Concrete Elements
15156/25/20086/25/2008
General Site AnalysisGeneral Site Analysis
Generation of time historiesGeneration of time historiesAmplified for hilltopAmplified for hilltop
Free-field soil analysisFree-field soil analysis
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Amplified Hilltop Response SpectraAmplified Hilltop Response Spectra
0.00
0.10
0.20
0.30
0.40
0.50
0.60
0 1 10 100
Frequency (Hz)
Sp
ectr
al A
ccel
erat
ion
(g
)
Hill Top spectra- 5 % Damping
PC-3 Input Spectra (1060-Rev 8)
In put M otio n
30 0 fee t 6 0 fee t6 0 fee t
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Horizontal Hilltop Time HistoryHorizontal Hilltop Time History
Time History PlotTime History Plot
0.00
0.10
0.20
0.30
0.40
0.50
0.60
0.70
0.80
0 1 10 100
Frequency (Hz)
Sp
ectr
al A
ccel
erat
ion
(g
)
130% of input Spectra
Hill Top PSectra calculated from FIT
Input Spectra
90% of Input spectra
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Soil ProfileSoil Profile
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Soil ProfileSoil Profile
20206/25/20086/25/2008
Free-Field Soil AnalysisFree-Field Soil Analysis
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-210
-200
-190
-180
-170
-160
-150
-140
-130
-120
-110
-100
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0
0 200 400 600 800 1000 1200 1400 1600
Shear Wave Velocity (fps)
Dep
th (
ft)
High Strain B.E. Soil
B.E. Soil input in SHAKE
HILL
Best Estimate Soil (Upper and Lower Bound not shown)
High StrainLow Strain
21216/25/20086/25/2008
Filter Cells and Hold Tank Room AnalysisFilter Cells and Hold Tank Room Analysis
Perform Soil-Structure Interaction (SSI) on the Perform Soil-Structure Interaction (SSI) on the Filter Cells and Hold Tank Room SASSI modelFilter Cells and Hold Tank Room SASSI model Obtain response at connection points of Enclosure Obtain response at connection points of Enclosure
BuildingBuilding Apply response to FEM of Enclosure Building and Apply response to FEM of Enclosure Building and
Benzene Stripper BuildingBenzene Stripper Building
22226/25/20086/25/2008
Filter Cells and Hold Tank Room Filter Cells and Hold Tank Room Mode ShapesMode Shapes
X
YZ
Dynamic Mode ShapeMode 11 CYC/SECFreq 2.616E+01
North
X
YZ
Dynamic Mode ShapeMode 14 CYC/SECFreq 2.896E+01
North
EW Frequency 26 Hz NS Frequency 28 Hz
E-W
N-S
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Filter Cells and Hold Tank RoomFilter Cells and Hold Tank RoomTransfer FunctionsTransfer Functions
Frequency 26 Hz
Fixed-Base
Frequency 7 Hz
Soil Structure Interaction
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In-Structure Response Spectra at In-Structure Response Spectra at Top of Filter CellsTop of Filter Cells
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In-Structure Response Spectra at In-Structure Response Spectra at Top of Hold Tank RoomTop of Hold Tank Room
Spectra Amplifies at
Thin Wall of
Hold Tank Room
26266/25/20086/25/2008
Filter Cells and Hold Tank Room AnalysisFilter Cells and Hold Tank Room Analysis
Perform SSI on the House modelPerform SSI on the House model Obtain zero-period accelerations at each nodeObtain zero-period accelerations at each node
Apply as equivalent static loads in GT STRUDLApply as equivalent static loads in GT STRUDL
Run GT STRUDL stiffness analysisRun GT STRUDL stiffness analysis Apply section cuts to obtain demandsApply section cuts to obtain demands Compute capacities based on existing conditionsCompute capacities based on existing conditions
Shear wall demand to capacity spreadsheet macroShear wall demand to capacity spreadsheet macro Report demand to capacity ratiosReport demand to capacity ratios
27276/25/20086/25/2008
Filter Cells and Hold Tank Room Filter Cells and Hold Tank Room Shear DemandsShear Demands
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Enclosure Building AnalysisEnclosure Building Analysis
Run GT STRUDL response spectra analysisRun GT STRUDL response spectra analysis Using the soil-structure interaction input motionUsing the soil-structure interaction input motion Check ASD9 codeCheck ASD9 code Check ASCE 7-05 wind loadsCheck ASCE 7-05 wind loads Report demand to capacity ratiosReport demand to capacity ratios
29296/25/20086/25/2008
Enclosure Building Enclosure Building Mode ShapesMode Shapes
X
Y
Z
Dynamic Mode ShapeMode 2 DEG/SECFreq 2.884E+00
North
Mode 2 (X- E-W) 2.88 Hz
X
Y
Z
Dynamic Mode ShapeMode 5 DEG/SECFreq 4.278E+00
Mode 5 (Z-N-S) 4.3 Hz
North
N-S
EW Frequency 2.9 Hz NS Frequency 4.3 Hz
30306/25/20086/25/2008
Enclosure Building Enclosure Building Mode Shapes at StairwellMode Shapes at Stairwell
X
Y
Z 1
2
3A
C
Per Dwg. no connectionbetween stairs and column 1
North
X
Y
Z
Dynamic Mode ShapeMode 3 DEG/SECFreq 1.758E+00
Occurs at NS Frequency 1.8 Hz
31316/25/20086/25/2008
Enclosure Building Enclosure Building ASD9 Code CheckASD9 Code Check
Members in red fail due to seismic
F factor is necessary
32326/25/20086/25/2008
Enclosure Building Enclosure Building FF Factor Factor
Component Fμ Steel Beams 2.0* Steel Diagonal Braces 1.75 Column Flexure 1.5 Column Axial 1.0
The elastically calculated PC-3 seismic responses can be
reduced by the inelastic energy absorption capacity factor (Fμ).
33336/25/20086/25/2008
Enclosure Building Enclosure Building ASCE 7 Wind LoadingASCE 7 Wind Loading
107 mph
34346/25/20086/25/2008
Enclosure Building Enclosure Building Wind Demand to Capacity RatiosWind Demand to Capacity Ratios
35356/25/20086/25/2008
Enclosure BuildingEnclosure BuildingShear ComparisonShear Comparison
PC-2 Wind Base Shear EW 137 kips < PC-3 Seismic Base Shear 150 kipsPC-2 Wind Base Shear NS 68 kips < PC-3 Seismic Base Shear 112 kips
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PC-2 wind West - East LC 31
North
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PC-2 Wind South-North LC 33
North
36366/25/20086/25/2008
Benzene Stripper Building AnalysisBenzene Stripper Building Analysis
Run GT STRUDL response spectra analysisRun GT STRUDL response spectra analysis Using the soil-structure interaction input motionUsing the soil-structure interaction input motion Including ASCE 7-05 wind Including ASCE 7-05 wind Check ASD9 codeCheck ASD9 code Report demand to capacity ratiosReport demand to capacity ratios Apply section cuts to obtain concrete demandsApply section cuts to obtain concrete demands Compute capacities based on existing conditionsCompute capacities based on existing conditions
Shear wall demand to capacity spreadsheet macroShear wall demand to capacity spreadsheet macro Report demand to capacity ratiosReport demand to capacity ratios
37376/25/20086/25/2008
Benzene Stripper Building Benzene Stripper Building Mode ShapesMode Shapes
EW Frequency 3.9 Hz NS Frequency 3.0 Hz
38386/25/20086/25/2008
Benzene Stripper Building Benzene Stripper Building Seismic Demand to Capacity RatiosSeismic Demand to Capacity Ratios
39396/25/20086/25/2008
Benzene Stripper Building Benzene Stripper Building ASCE 7 Wind LoadingASCE 7 Wind Loading
27.01 lbf/sft
26.84 lbf/sft
26.27 lbf/sft
26.03 lbf/sft
Windward Side
8 9 10
19.24 lbf/sft
18.89 lbf/sft
18.54 lbf/sft
18.39 lbf/sft
Leeward Side
Roof Level
40' level floor
23' 8-5/8" level floor
-24.68 lbf/sft
-24.19 lbf/sft
-23.69 lbf/sft
-23.49 lbf/sft
-24.68 lbf/sft
-24.19 lbf/sft
-23.69 lbf/sft
--23.49 lbf/sft
Side Walls (North / South) Walls)
-24.44 lbf/sft(Average)
23.94 lbf/sft(Average)
-23.59 lbf/sft
107 mph
40406/25/20086/25/2008
Benzene Stripper Building Benzene Stripper Building ASCE 7 Wind LoadingASCE 7 Wind Loading
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Z
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North
Load case 31 east to West PC-2 Wind
41416/25/20086/25/2008
Benzene Stripper Building Benzene Stripper Building Wind Demand to Capacity Ratios Wind Demand to Capacity Ratios
Braces that exceed 1.0 are qualified as tension members
42426/25/20086/25/2008
Seismic DisplacementsSeismic Displacements
Enclosure Building Displacement
Wind Seismic
NS 0.07 in 0.26 in
EW 0.18 in 0.97 in
Vertical 0.98 in 1.21 in
Stripper Building Displacement Wind Seismic 0.001 in 0.001 in
L H =4 0 ft
H = 3 0 ft
Enclosure
North
6/25/20086/25/2008 4343
ConclusionsConclusions
44446/25/20086/25/2008
ConclusionsConclusions
Adequate for PC-3 seismic and PC-2 wind loadsAdequate for PC-3 seismic and PC-2 wind loads Enclosure BuildingEnclosure Building Filter Cells and Hold Tank RoomFilter Cells and Hold Tank Room Benzene Stripper BuildingBenzene Stripper Building
No pounding occursNo pounding occurs
6/25/20086/25/2008 4545
Questions?Questions?
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