Simulation of earthquake : Study of a 3 concrete packages stack stability

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Simulation of earthquake : Study of a 3 concrete packages stack stability

  1. 1. Date : 09/11/11 EHTC 2011 1 / 10 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
  2. 2. EHTC 2011- Simulation of seism : study of a concrete packages stack stability 2 / 10 Background Numerical approach Trolley introduction : Geometry FE models Simulations Results Conclusions
  3. 3. EHTC 2011- Simulation of seism : study of a concrete packages stack stability 3 / 10 Deep geological storage for long-lived high-and medium level waste Long-Lived High and Medium Level Waste Project (LLH-MW) : Concrete packages Trolley Storage area overview – cells network Concrete packages stack handling in cell thru trolley transfersBackground Numerical Approach Trolley introduction Results Conclusions
  4. 4. EHTC 2011- Simulation of seism : study of a concrete packages stack stability 4 / 10 Goal of the study : simulations to evaluate the consequences of an earthquake on the stabilityconcrete packages stack laid on a transfer trolley First step : Linear modal analysis (Optistruct) to determinate the Eigen vectors of the transfertrolley loaded with a 3 concrete packages stack. This stack is modeled by added mass on the tray. BC areapplied 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 includingthe packages. The excitation corresponds to the “most dangerous” Eigen mode extracted from previousanalysis. Contacts are added between the packages and between the first package and the tray of thetrolley. Common modeling (meshing under HyperMesh) for the 2 types of simulation (implicit and explicit)Background Numerical Approach Trolley introduction Results Conclusions
  5. 5. EHTC 2011- Simulation of seism : study of a concrete packages stack stability 5 / 10 Lid (concrete) Concrete Packages 1 cutted primary stack package (steel) Container with 4 housing (concrete) Winch with 3 brackets between pulleys frame forks Winch with 2 rollers braket pulleys Intermediary in contact with tray pulleys Trolley frame Middle Tray plate on Lever the trayLever Tray in Elevation system kinematic upper Trolley frame position Geometry Reinforced solutionBackground Numerical Approach Trolley introduction Results Conclusions
  6. 6. EHTC 2011- Simulation of seism : study of a concrete packages stack stability 6 / 10 Meshing with HyperMesh for both calculations : Optistruct and RADIOSS Block Transfer trolley (2D mesh) Original tray Reinforced tray Middle plate 2 versions of tray (2D mesh) Beam Concrete container Added Mass on tray for RADIOSS Block for packages stack for simulation only Optistruct simulation (3D mesh) Cutted view Contact tray / rollers MeshingBackground Numerical Approach Trolley introduction Results Conclusions
  7. 7. EHTC 2011- Simulation of seism : study of a concrete packages stack stability 7 / 10 Modeling with HyperMesh Modeling with HyperCrash for modal analysis (Optistruct) for explicit simulation (RADIOSS Block) 0<A<1g A Seism spectrum Boundary conditions : 1g Imposed acceleration Vini locks combination on wheels along 1,2 or3 on trolley wheels (amplitude A) 2 Vini 3 1g 1 Gravity Vini stabilization Contacts between packages Lock balancing Initial velocity for stack Lock along 12 along 2 Imposed velocity for tray Lock Lock along 123 along 2 t0 Step 1 t1 Step 2 t2 Step 3 Time ModelingBackground Numerical Approach Trolley introduction Results Conclusions
  8. 8. EHTC 2011- Simulation of seism : study of a concrete packages stack stability 8 / 10 3 identified risky modes shape for stack stability 1rst Mode (~2 Hz) : 2nd Mode (~5 Hz) : Tray fork transversal displacement Trolley longitudinal displacement X axle Y axle Z axle Z Trans Y Trans X Trans X Rot%age of total mass Y Rot 3rd Mode (~13 Hz) : pumping mode shape of lever & tray  Reserved mode  Become 14 Hz in case of reinforced Mode 1 Mode 2 frame Mode 3 Mode 4 Mode 5 Mode 6 (reserved mode) Modal analysisBackground Numerical Approach Trolley introduction Results Conclusions
  9. 9. EHTC 2011- Simulation of seism : study of a concrete packages stack stability 9 / 10 RADIOSS Block transient simulation with sinusoidal excitation (f = 14Hz, amplitude 2 g) Stack movement (1 animation every 700 ms) Explicit calculationBackground Numerical Approach Trolley introduction Results Conclusions
  10. 10. EHTC 2011- Simulation of seism : study of a concrete packages stack stability 10 / 10The HyperWorks suite allowed to simulate earthquake effect using a transient signal coming from aprevious 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 influenceBackground Numerical Approach Trolley introduction Results Conclusions

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