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Vulnerability and Robustness of a Security Skyscraper Subjected to Aircraft Impact

: Nöldgen, M.; Fehling, E.; Riedel, W.; Thoma, K.


Computer-Aided Civil and Infrastructure Engineering 27 (2012), Nr.5, S.358-368
ISSN: 1093-9687
ISSN: 0885-9507
ISSN: 1467-8667
Fraunhofer EMI ()

Ultra-high-performance concrete (UHPC) is particularly suitable for application in aircraft-impact-resistant high-rise buildings for combined load-bearing and protective structures. The material provides very high-steel-like-compressive strength, sufficient ductility, and fire resistance due to the addition of steel and polypropylene fibers. The following contribution is focused on two key aspects: hydro-code simulations of structural UHPC walls which protect vertical escape and rescue routes and structural dynamic simulations of the global structure to investigate the impact resistance considering the sudden loss of external columns. A high-speed dynamic material model for UHPC is obtained by implementing the results of a series of Hopkinson-Bar experiments which were recently published. The strain-rate-dependent material properties are implemented in the established RHT-Concrete-Model for hydro-code applications being furthermore extended by a tensile softening law fo r fiber-reinforced UHPC. Based on this material model a series of aircraft-engine impact experiments are configurated supported by three-dimensional nonlinear hydro-code prognosis simulations. With a total of six impact experiments on combined fiber- and rebar-reinforced UHPC panels, all relevant damage states of the structural wall are obtained. The experimental results are compared to the hydro-code prognosis simulations to validate the simulative approach and the material model for UHPC. In addition to the local impact behavior, structural dynamic numerical simulations of a global high-rise structure are presented being focused on the effect of the sudden and notional loss of columns in coincidence with the aircraft impact load function.