The Benchmark Project IRIS on Missile Impacts on Concrete Containment Structures - Modelling Approach & Analysis Results of JRC

This paper describes the modelling approach and major results of the numerical analyses performed by the Joint Research Centre (JRC) – Institute for Energy (IE), Petten, The Netherlands and Altair Engineering France within the benchmark project “Improving Robustness Assessment Methodologies for Structures impacted by Missiles (IRIS)”. The benchmark project was initiated and carried out within the “Subgroup on Concrete” of the “Working Group on the Integrity and Ageing of Components and Structures (WG IAGE)” of the Nuclear Energy Agency (NEA) of the OECD and lasted the complete year of 2010. Within IRIS each participant was requested to perform numerical analyses on three rather different missile impact tests (two flexural failure tests and one punching shear test) in which missiles were impacted into reinforced concrete slabs. The two flexural failure tests were the Meppen-II-4 Test and a new flexural failure test performed at VTT. The punching shear test was a new missile impact test performed at VTT during the benchmark project. The objective of the numerical analyses was to investigate to what extend they are capable to predict the outcome of these tests. The FE analyses presented in this paper were carried out using complete three dimensional models with Lagrangian meshes for concrete slabs and missiles. The deformation behaviour of the missiles in all three tests could be predicted accurately by the FE analyses. The slab behaviour was more difficult to predict. The punching through of the missile in the punching shear test at VTT could not be predicted, but scabbing pattern and shear cone inside the slab were estimated quite accurately. Cracking and damage patterns could be well predicted for all three tests, where as the prediction of magnitude and frequency of time series for slab displacements, rebar strains and reaction forces (for Meppen-II-4 Test) varied between the tests. The FE analyses have shown that the prediction of the outcomes of punching shear test is more difficult than for a flexural failure test and that the outcomes of flexural failure tests can be predicted with quite some accuracy with today’s FE codes.

MARTIN Oliver;  CENTRO Vincent;  SCHWOERZIG Thierry; 

2012-03-30

International Association for Structural Mechanics in Reactor Technology (IASMiRT)

JRC62732

https://publications.jrc.ec.europa.eu/repository/handle/JRC62732,