EHTC 2011 1
Simulation of earthquake : Study of a 3 concrete packages stack stability
Authors : Eric TOGNI / Sylvain THOLANCE
Company : ATR Ingénierie
119 Bd STALINGRAD, 69100 VILLEURBANNE (France)
Contact : standard : +33 (0) 4 78 94 32 02
[email protected] / [email protected]
Date : 09/11/11 / 10
EHTC 2011- Simulation of seism : study of a concrete packages stack stability
Background
Numerical approach
Trolley introduction :
Geometry
FE models
Simulations Results
Conclusions
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EHTC 2011- Simulation of seism : study of a concrete packages stack stability
Long-Lived High and Medium Level Waste Project (LLH-MW) :
Deep geological storage for long-lived high-and medium level waste
Storage area overview – cells network Concrete packages stack handling in cell
thru trolley transfers
Background Numerical Approach Trolley introduction Results
Concrete
packages
Trolley
3
Conclusions
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EHTC 2011- Simulation of seism : study of a concrete packages stack stability
Background Numerical Approach Trolley introduction Results
Goal of the study : simulations to evaluate the consequences of an earthquake on the stability
concrete packages stack laid on a transfer trolley
First step : Linear modal analysis (Optistruct) to determinate the Eigen vectors of the transfer
trolley loaded with a 3 concrete packages stack. This stack is modeled by added mass on the tray. BC are
applied at the wheel locations.
Lead to identification of the most “risky” Eigen vector (frequency and mode shape) regarding stack stability
Second step : Non linear transient analysis (RADIOSS Block) of the transfer trolley including
the packages. The excitation corresponds to the “most dangerous” Eigen mode extracted from previous
analysis. Contacts are added between the packages and between the first package and the tray of the
trolley.
Common modeling (meshing under HyperMesh) for the 2 types of simulation (implicit and explicit)
4
Conclusions
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EHTC 2011- Simulation of seism : study of a concrete packages stack stability 5
Background Numerical Approach Trolley introduction Results
Concrete
Packages
stack
Geometry
Winch with
pulleys Intermediary
pulleys
Lever Tray in
upper
position Trolley frame
Lid
(concrete)
Container with 4
housing (concrete)
1 cutted primary
package (steel)
Reinforced solution
Middle
plate on
the tray
3 brackets between
frame forks
2 rollers braket
in contact with tray
Trolley frame
Winch with
pulleys
Lever Tray
Elevation system kinematic
Conclusions
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EHTC 2011- Simulation of seism : study of a concrete packages stack stability
Background Numerical Approach Trolley introduction Results
Meshing
Concrete container
for RADIOSS Block
simulation only
(3D mesh)
Middle plate
Reinforced tray Original tray
2 versions of tray (2D mesh)
Beam
Cutted view Contact
tray / rollers
Added Mass on tray
for packages stack for
Optistruct simulation
Meshing with HyperMesh for both calculations : Optistruct and RADIOSS Block
Transfer trolley (2D mesh)
6
Conclusions
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EHTC 2011- Simulation of seism : study of a concrete packages stack stability 7
Background Numerical Approach Trolley introduction Results
Modeling
Lock
along 123
Lock
along 12 Lock
along 2
Lock
along 2
Boundary conditions :
locks combination on wheels along 1,2 or3
1
2
3
Modeling with HyperMesh
for modal analysis (Optistruct)
0<A<1g
Time t0 t1
1g
1g
Vini
Vini
Vini Gravity
stabilization
Contacts between
packages
balancing Initial velocity for stack
Imposed velocity for tray
Imposed acceleration
on trolley wheels
(amplitude A)
t2 Step 1 Step 2 Step 3
Modeling with HyperCrash
for explicit simulation (RADIOSS Block)
Seism
spectrum
A
Conclusions
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EHTC 2011- Simulation of seism : study of a concrete packages stack stability 8
Background Numerical Approach Trolley introduction Results
3 identified risky modes shape for stack stability
1rst Mode (~2 Hz) :
Tray fork transversal displacement 2nd Mode (~5 Hz) :
Trolley longitudinal displacement
3rd Mode (~13 Hz) :
pumping mode shape of lever & tray
Reserved mode
Become 14 Hz in case of reinforced
frame Mode 1 Mode 2 Mode 3 Mode 4 Mode 5
Mode 6
(reserved mode)
X Trans X Rot Y Trans
Y Rot
%a
ge
of
tota
l m
ass Z Trans
X axle
Y axle
Z axle
Conclusions
Modal analysis
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EHTC 2011- Simulation of seism : study of a concrete packages stack stability 9
Background Numerical Approach Trolley introduction Results
Explicit calculation
RADIOSS Block transient simulation with sinusoidal excitation (f = 14Hz, amplitude 2 g)
Stack movement
(1 animation every 700 ms)
Conclusions
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EHTC 2011- Simulation of seism : study of a concrete packages stack stability / 10 10
Background Numerical Approach Trolley introduction Conclusions Results
The HyperWorks suite allowed to simulate earthquake effect using a transient signal coming from a
previous modal analysis
Linear modal analysis (Optistruct) :
emphasize the interest of some structure improvement such frame and tray reinforced solutions
and link by cable between lever and pulley : proposal of brackets on frame
selected mode shape for explicit simulation : vertical pumping at 14Hz
Non linear temporal calculation (RADIOSS Block) :
solicitation at f = 14Hz with a 2g amplitude leads to understand the stack response corresponding
to loose temporary the contacts between the concrete packages and between the first one and tray
the frequency of the signal has a limited influence on results : it just fixes the bandwidth inside which
the stack would be excited. Amplitude has much more influence
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