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|Title:||Finite Element Analysis on the Meppen Slab Tests - Modelling Approach & First Results|
|Authors:||MARTIN Oliver; CENTRO Vincent; SCHWOERTZIG Thierry|
|Citation:||ATW-INTERNATIONAL JOURNAL FOR NUCLEAR POWER vol. 55 no. 12 p. 767-774|
|Publisher:||INFORUM VERLAGS-VERWALTUNGSGESELLSCHAFT MBH|
|Type:||Articles in periodicals and books|
|Abstract:||In this paper the modelling approach and results of Finite Element (FE) analyses on the 4th test of the second series of the Meppen slab tests using the explicit FE solver RADIOSS are outlined. The described FE analyses were carried out within the Benchmark Project "Improving the Robustness of Assessment Methodologies for Structures impacted by Missiles (IRIS)" of the Subgroup on Concrete of the Working Group on the Integrity and Ageing of Components and Structures (IAGE) of the Nuclear Energy Agency (NEA). Lagrangian meshes are used for the missile and the concrete slab. The steel reinforcement inside the concrete slab is modelled via beam elements with proper cross section definitions. Special emphasis is put on the constitutive models of the involved materials. A Drucker-Prager/Cap model is used to model the constitutive behavior of the concrete. Elastic-plastic constitutive models with strain-rate dependencies are used for steel reinforcements and missile. Failure mode, crack pattern and shape of the deformed missile of the Meppen II-4 Test are resembled by the FE analyses. A shear cone is clearly induced in the mesh of the concrete slab and its dimensions agree well with the dimensions of the shear cone from the real test. Calculated deflections of certain nodes on the FE mesh of the concrete slab show that vibrations were induced, which resembles real slab behaviour when impacted by a missile. The calculated residual centre deflection on the backside of the concrete slab and the calculated magnitude of the contact force between missile and concrete slab are in very good agreement with measured test values. In summary with today's explicit FE solvers it is possible to predict the global outcome of high impact problems like missiles impacting reinforced concrete slabs quite accurately.|
|JRC Directorate:||Energy, Transport and Climate|
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