Damage of Reinforced Concrete Walls from Shock and Impact · solver approach in evaluating damage...
Transcript of Damage of Reinforced Concrete Walls from Shock and Impact · solver approach in evaluating damage...
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Damage of Reinforced Concrete Walls from Shock and ImpactCoupled Multi-Solver Approach
Damage of Reinforced Concrete Walls from Shock and ImpactCoupled Multi-Solver Approach
X. QuanDevelopment EngineerCentury Dynamics, ANSYS, Inc.
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• Introduction• Methods of Space Discretization (MSD)• Coupled Multi-Solver Approach
– Interaction/coupling among MSD• Numerical Simulations
– Truck bomb explodes near a physical barrier– Boeing 747 jet impacts physical barriers
• Conclusions
Overview
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Physical Barriers
• Built around nuclear power plants• May consist of multiple barriers• Usually made of steel-reinforced concretes• Must provide adequate structural strength
to prevent failure under terrorist attacks– complete demolition– projectile/fragment penetration– spalling of barrier materials
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• Can supply detailed and accurate stress/strain fields than simplified analytical approaches
• Use nonlinear dynamic analysis computer program ANSYS AUTODYN
• Investigate damage initiation and development in a steel reinforced concrete wall under shock and impact loadings
Numerical Simulations
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Space Discretization
• Lagrange– numerical grid moves with material
• Euler– material moves through fixed numerical grids
• ALE (Arbitrary Lagrange Euler)– rezoning the interior continuously
• Meshfree: Smooth Particles Hydrodynamics– each particle is an interacting mass and
interpolation point
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Space Discretization
• Use Single Space Discretization Method– Advantage
• easy setup of computational models– Disadvantages
• not appropriate to all the regimes of the problem• response of structures to an explosion: detonation
and blast are best modeled by Euler while structural response is best modeled by Lagrange
• Need Coupled Space Discretization Methods-Coupled Multi-Solver Approach
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Coupled Multi-Solver
• Lagrange/Lagrange– interactions between Lagrangian grids– contact/slide surfaces– best to simulate impact problems
• Euler/Lagrange– coupling between Eulerian/Lagrangian grids– best to simulate structural response to
explosive loadings
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Concrete Wall
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Concrete Wall
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Material Modeling
• Concrete: RHT Strength and Failure– pressure hardening– strain hardening– strain rate hardening– damage (strain softening)
• Reinforced Steel Bars– von Mises strength– ultimate strain failure– reinforced ratio: 0.8%
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Numerical Modeling
• Concrete is represented by– 36,000 Lagrange solid elements
• Steel rebars are represented by– 6,000 beam elements
• Explosive detonation and expansion of gas products are modeled by Euler solvers– from 1,000,000 to 2,000,000 Euler-Ideal gas
elements in 3D simulations• Euler/Lagrange coupling is applied
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Location of Bomb
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1D to 3D Remap
• 1D Euler simulation on explosive detonation and its spherical expansion
• Before it reaches the wall, 1D blast field is remapped onto a 3D Euler-Ideal gas grid
• Advantages of remapping– unique feature of ANSYS AUTODYN– save a lot of computing time in 3D calculation– accurate modeling early stages of the blast
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1D to 3D Remap
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Damage: Contact
Front View
Back View
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Damage: Contact
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Damage: 5m
Front View
Back View
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Damage: 10m/20m
10m, front 20m, front
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Total Energy
5 m Detonation
20 m Detonation
10 m Detonation
Tota
l Ene
rgy
(µJ)
Time (ms)
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Summary
• 60m wide, 30m high, and 1m thick steel-reinforced concrete wall is considered
• Truck bomb contains 5000Kg TNT• The wall stands when the bomb explodes at
– 10m– 20m
• The wall fails when the bomb explodes at– 0m, contact detonation– 5m
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Jet Impact
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Material Modeling
• Airplane is made of aluminum with– linear equation of state– piecewise linear strain hardening strength– ultimate strain failure– erosion
• Thickness is adjusted so the overall weight of the entire airplane and weight distribution among fuselage, engines, and fuel are correctly represented.
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Numerical Modeling
• Concrete is represented by– 56,000 solid elements for 1m thick wall– 186,000 solid elements for 3m thick wall
• Steel rebars are represented by– 16,000 beam elements
• Airplane is represented by– 15,000 shell elements
• Lagrange/Lagrange interaction is applied
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1m Thick Wall
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3m Thick Wall
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Damage: 1m Thick
Front View
Back View
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Damage: 3m Thick
Front View
Back View
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Summary
• 1m & 3m thick, 150m wide, 60m high steel-reinforced concrete walls are considered
• Walls are impacted by a Boeing 747 passenger jet
• Impact velocity: 83.3m/s (300km/s)• 1m thick wall fails under the impact• 3m thick wall withstands the impact
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Conclusions
• The shock and impact simulations demonstrate the successful use of the coupled multi-solver approach.
• ANSYS AUTODYN has the capability to simulate various terrorist threats against physical barriers of nuclear power plants.
• ANSYS AUTODYN can be the most cost effective numerical tool for physical barrier designers
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References
• X. Quan, et al, Applications of a coupled multi-solver approach in evaluating damage of reinforced concrete walls from shock and impact, 18th international conference on structural mechanics in reactor technology , Beijing, China, August 7-12, 2005
• M. Katayama et al, Numerical simulation of jumbo jet impacting on thick - concrete wall—effects of reinforcement and wall thickness, 2nd Asian conference on high pressure research, Nara, Japan, November 1-5, 2004