Principia presente en la 9th International Conference on Structural Dynamics. El artículo presentado es:
Analysis of Combined Bending and Punching Tests of Reinforced Concrete Slabs within IMPACT III Project
Rainer Zinn(1), Michael Borgerhoff(1), Friedhelm Stangenberg(1), Christian Schneeberger(2), Javier Rodríguez(3), Luis Lacoma(3), Francisco Martínez(3), Joaquín Martí(3)
(1) Stangenberg & Partner Ingenieur-GmbH, Viktoriastr. 47, 44787 Bochum, Germany
(2) Swiss Federal Nuclear Safety Inspectorate ENSI, Industriestrasse 19, 5200 Brugg, Switzerland
(3) Principia Ingenieros Consultores, Velázquez 94, 28006 Madrid, Spain
This paper focuses on outcomes of a collaborative work between the Swiss Federal Nuclear Inspectorate (ENSI) and its consultants Principia and Stangenberg & Partner. ENSI participates in the IMPACT III project organized by the Technical Research Center VTT (Finland) and funded by several institutions including ENSI. As part of the IMPACT III project, reduced scale impact tests of reinforced concrete structures are being carried out in Espoo (Finland). The series of combined bending and punching tests pursues the objective of investigating the influence of different combinations of longitudinal and transverse reinforcement on the structural behaviour while the ultimate load capacity of the slab in bending and shear is not exceeded but almost reached. The simulation of test X3 is presented, and the results are compared with those obtained in the test which will be carried out in August, 2013. The general object of the exercise is to improve the safety of nuclear facilities and, more specifically, to demonstrate the capabilities of current finite element techniques to reproduce the details of the behaviour of a reinforced concrete structure impacted by a soft missile.
The missile is constituted by a steel tube with diameter 219.1 mm, shell thickness 6.35 mm, and mass 50 kg. The impact velocity is 140 m/s. The target is a 250 mm thick, reinforced concrete wall that spans 2 m by 2 m and is held by a steel supporting frame and 4 steel back pipes. The reinforcement includes longitudinal rebars with quantities 8.7 cm2/m in each direction and face, and transverse reinforcement with quantity 17.45 cm²/m² consisting of closed stirrups. The intended concrete quality is C40/50, and reinforcing steel S500 is used.
Blind non-linear pre-computations have been carried out with the software Abaqus (Principia) and SOFiSTiK (Stangenberg), and also with 2-dof-systems. In the Abaqus/Explicit simulation the concrete wall is modelled ith solid elements and its rebars with embedded beam elements; the contacting missile is also included. All the material models are non-linear; in particular, a damaged plasticity formulation is defined for the concrete. In the code SOFiSTiK the reinforced concrete target is modelled with non-linear, layered shell elements regarding the reinforcement at both sides; non-linear shear deformations of shell/plate elements are pproximately included. The results of pre- and post-test calculations are compared to the actual observations in the test.