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

eric.togni@atr-ingenierie.fr / sylvain.tholance@atr-ingenierie.fr

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