Transcript Type I and II Tanks

2008 GT STRUDL Users Group
Meeting & Training Seminar
Soil-Structure Interaction
Analysis of a Composite
Structure on a Backfill Hilltop
WSRC-STI-2008-00269 Rev 0
Lisa Anderson, Bechtel National, Inc.
Jay Amin, Washington Savannah River Co.
June 25, 2008
6/25/2008
1
Overview
Scope of Analysis
Building Description
Analysis
Conclusions
6/25/2008
2
Scope of Analysis
6/25/2008
3
Scope of Analysis
Assess feasibility of adding new process to this
complex
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6/25/2008
Building complex constructed in 1980’s
Not designed to resist current seismic loads or wind
loads
Lateral load path is not well defined
4
Scope of Analysis
Evaluate the structures for
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
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Normal operating dead and live loads
PC-3 seismic loads*
PC-2 wind loads*
administrative controls will stop process prior to tornado
events

II/I concerns*
*DOE Standard 1020
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5
Building Description
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6
Building Complex
Split up for analysis
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Filter Cells and Hold Tank Room (Concrete)
Enclosure Building (Steel)
Benzene Stripper Building (Composite)
7
Building Complex
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8
Building Complex
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9
Analysis
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10
Finite Element Models
Create finite element models in GT STRUDL
using a model builder program

Filter Cells and Hold Tank Room
Convert Filter Cells and Hold Tank Room to SASSI House
Model
STRUSASSI
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Enclosure Building
Benzene Stripper Building
11
Filter Cells and Hold Tank Room
SBHQ6 Elements
Filter Cells
1:1 Mesh
Hold Tank Room
except
column support
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12
Enclosure Building
6
Hold tank room
5
Filter Cells
4
Crane Controll Room Wall
3
North
A
Y
Z
2
X
FIXED JOINT
SUPPORT FX FY FZ MY
B
C
1
Hill
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Grade
13
Benzene Stripper Building
Y
Z
X
CONCRETE
MODEL
SBHQ6 Concrete Elements
< 2:1 Mesh
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14
General Site Analysis
Generation of time histories
Amplified for hilltop
Free-field soil analysis
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15
Amplified Hilltop Response Spectra
60 feet
0.60
Spectral Acceleration (g)
0.50
300 feet
60 feet
Input Motion
0.40
0.30
Hill Top spectra- 5 % Damping
PC-3 Input Spectra (1060-Rev 8)
0.20
0.10
0.00
0
1
10
100
Frequency (Hz)
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16
Horizontal Hilltop Time History
History
Plot Spectra (5% DAMPING)
ITP HILL TOP Time
Acceleration
Response
FIT program H1 T.H. spectra vs ASCE 43 criteria
0.80
0.70
Spectral Acceleration (g)
0.60
0.50
0.40
0.30
0.20
130% of input Spectra
Hill Top PSectra calculated from FIT
0.10
Input Spectra
90% of Input spectra
0.00
0
1
10
100
Frequency (Hz)
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17
Soil Profile
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18
Soil Profile
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19
Free-Field Soil Analysis
Best Estimate Soil (Upper and Lower Bound not shown)
High Strain B.E. Soil
B.E. Soil input in SHAKE
High Strain
Low Strain
0
-10
HILL
-20
-30
-40
-50
-60
-70
-80
-90
Depth (ft)
-100
-110
-120
-130
-140
-150
-160
-170
-180
-190
-200
-210
-220
-230
0
200
400
600
800
1000
1200
1400
1600
Shear Wave Velocity (fps)
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20
Filter Cells and Hold Tank Room Analysis
Perform Soil-Structure Interaction (SSI) on the
Filter Cells and Hold Tank Room SASSI model
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Obtain response at connection points of Enclosure
Building
Apply response to FEM of Enclosure Building and
Benzene Stripper Building
21
Filter Cells and Hold Tank Room
Mode Shapes
EW Frequency 26 Hz
NS Frequency 28 Hz
Dynamic Mode Shape
Mode 11
CYC/SEC
Freq 2.616E+01
Dynamic Mode Shape
Mode 14
CYC/SEC
Freq 2.896E+01
E-W
North
Z
Y
X
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North
Z
Y
X
N-S
22
Filter Cells and Hold Tank Room
Transfer Functions
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Fixed-Base
Soil Structure Interaction
Frequency 26 Hz
Frequency 7 Hz
23
In-Structure Response Spectra at
Top of Filter Cells
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24
In-Structure Response Spectra at
Top of Hold Tank Room
Spectra Amplifies at
Thin Wall of
Hold Tank Room
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25
Filter Cells and Hold Tank Room Analysis
Perform SSI on the House model
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Obtain zero-period accelerations at each node
Apply as equivalent static loads in GT STRUDL
Run GT STRUDL stiffness analysis
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Apply section cuts to obtain demands
Compute capacities based on existing conditions
Shear wall demand to capacity spreadsheet macro
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6/25/2008
Report demand to capacity ratios
26
Filter Cells and Hold Tank Room
Shear Demands
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27
Enclosure Building Analysis
Run GT STRUDL response spectra analysis
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Using the soil-structure interaction input motion
Check ASD9 code
Check ASCE 7-05 wind loads
Report demand to capacity ratios
28
Enclosure Building
Mode Shapes
EW Frequency 2.9 Hz
NS Frequency 4.3 Hz
Mode 5 (Z-N-S) 4.3 Hz
Mode 2 (X- E-W) 2.88 Hz
Dynamic Mode Shape
Mode 2
DEG/SEC
Freq 2.884E+00
Dynamic Mode Shape
Mode 5
DEG/SEC
Freq 4.278E+00
N-S
North
North
Y
Z
Y
X
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Z
X
29
Enclosure Building
Mode Shapes at Stairwell
Occurs at NS Frequency 1.8 Hz
Dynamic Mode Shape
Mode 3
DEG/SEC
Freq 1.758E+00
A
3
Per Dwg. no connection
between stairs and column 1
2
North
Y
Z
1
X
C
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Y
Z
X
30
Enclosure Building
ASD9 Code Check
Members in red fail due to seismic
F factor is necessary
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Enclosure Building
F Factor
Component
Steel Beams
Steel Diagonal Braces
Column Flexure
Column Axial
Fμ
2.0*
1.75
1.5
1.0
The elastically calculated PC-3 seismic responses can be
reduced by the inelastic energy absorption capacity factor (Fμ).
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32
Enclosure Building
ASCE 7 Wind Loading
107 mph
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Enclosure Building
Wind Demand to Capacity Ratios
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34
Enclosure Building
Shear Comparison
PC-2 wind West - East LC 31
PC-2 Wind South-North LC 33
IND LOAD 33
31
IND LOAD 31
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PC-2 Wind Base Shear EW 137 kips < PC-3 Seismic Base Shear 150 kips
PC-2 Wind Base Shear NS 68 kips < PC-3 Seismic Base Shear 112 kips
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35
Benzene Stripper Building Analysis
Run GT STRUDL response spectra analysis






Using the soil-structure interaction input motion
Including ASCE 7-05 wind
Check ASD9 code
Report demand to capacity ratios
Apply section cuts to obtain concrete demands
Compute capacities based on existing conditions
Shear wall demand to capacity spreadsheet macro

6/25/2008
Report demand to capacity ratios
36
Benzene Stripper Building
Mode Shapes
EW Frequency 3.9 Hz
6/25/2008
NS Frequency 3.0 Hz
37
Benzene Stripper Building
Seismic Demand to Capacity Ratios
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38
Benzene Stripper Building
ASCE 7 Wind Loading
107 mph
Roof Level
19.24 lbf/sft
27.01 lbf/sft
Leeward Side
-24.68 lbf/sft
-24.68 lbf/sft
-24.44 lbf/sft
(Average)
Windward Side
40' level
floor
18.89 lbf/sft
18.54 lbf/sft
26.84 lbf/sft
-24.19 lbf/sft
-24.19 lbf/sft
23.94 lbf/sft
(Average)
23' 8-5/8" level floor
26.27 lbf/sft
-23.69 lbf/sft
-23.69 lbf/sft
-23.59
lbf/sft
18.39 lbf/sft
26.03 lbf/sft
8
6/25/2008
9
10
--23.49 lbf/sft
-23.49 lbf/sft
Side Walls (North / South)
Walls)
39
Benzene Stripper Building
ASCE 7 Wind Loading
Load case 31 east to West PC-2 Wind
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Benzene Stripper Building
Wind Demand to Capacity Ratios
Braces that
exceed 1.0 are
qualified as
tension
members
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Seismic Displacements
Enclosure Building Displacement
Enclosure
Wind
North
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
LH=40 ft
H=30 ft
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Conclusions
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Conclusions
Adequate for PC-3 seismic and PC-2 wind loads
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Enclosure Building
Filter Cells and Hold Tank Room
Benzene Stripper Building
No pounding occurs
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Questions?
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