Structural dynamic behavior of reinforced concrete slabs under impact loads for variable velocities

The present paper describes essential results of comprehensive experimental investigations of the analysis of rc-slabs under impact loads. The presented work was done in collaboration between the Fraunhofer Institute for High-Speed Dynamics - Ernst-Mach-Institut (EMI) and the Technical University of Dresden (TUD) in the national research project impact on concrete structures - experiment and simulation sponsored by the DFG (Deutsche Forschungsgemeinschaft). In a comprehensive test series the loading of a so-called hard impact - that means the kinetic energy is almost completely introduced in the structure - was studied for different velocity ranges (4.2-6.0 m/s; 44-67 m/s and 200-274 m/s). The resulting damage phenomena and the dynamic structural response were measured by extensive instrumentation (strain gauges, pressure sensors, laser and high-speed cameras). The received data for low and high strain rates serves for the general understanding of the relations between local transient loading and global structural response. It is the basis for the adaption of existing material models, the development of engineering models and the validation of numerical calculations.