Carbon concrete sandwich elements under impact load – numerical and experimental investigation
This article examines the extent to which carbon concrete sandwich elements can contribute to building protection as prefabricated walls. The composite material carbon concrete enables thin‐walled constructions due to the corrosion‐resistant reinforcement. The sandwich panel consists of two 3 cm thin carbon concrete layers. Between the layers 8 cm of mineral fibre wool is placed as an insulating layer. Thanks to the layered structure, prefabricated parts can be produced that fulfil the requirements for load‐bearing capacity and building physics and can be used as wall elements in building envelopes. The article examines the extent to which such a sandwich wall element can provide structural protection against impact loads, such as those that can occur as a result of severe weather situations due to changed climatic conditions or anthropogenic causes. For this purpose, an impact test was carried out in the drop tower facility at TU Dresden. The damage caused by the impact, carried out with the compressed air‐accelerated mode of the drop tower facility, with a mass of 8.4 kg at an impact velocity of 35 m/s in the carbon concrete sandwich panel is investigated. In the experimental investigation, the fotogrammetrically determined accelerations and deflections are documented. In addition, the punching shear failure and the perforation of the carbon concrete sandwich panel are analysed in numerical simulations and the results are compared with the experimentally determined data.