US EPA

6873080 

Journal Article 

Investigation of concrete slabs under impact load 

Hummeltenberg, A; Beckmann, B; Weber, T; Curbach, M; , 

2011 

TRANS TECH PUBLICATIONS LTD 

DURNTEN-ZURICH 

398-+ 

10.4028/www.scientific.net/AMM.82.398 

WOS:000306394700063 

The behaviour of concrete slabs under dynamic load such as rock fall or vehicle impact is investigated in this work. The aim of this study is to enlarge the knowledge concerning the subsequent reinforcing of concrete slabs and its influence on their behaviour under impact load. Therefore, the results of the drop tower experiments with standard concrete, high performance concrete (HPC) and ultra-high performance concrete (UHPC) are compared and interpreted. The analysis of the test results focuses on the qualitative evaluation of the protective effect and on the quantitative evaluation of measurement results. Regarding the protective effect, the influence of the additional steel stirrup reinforcement is rather small. In contrast, the subsequent fabric reinforcement prevents the perforation of the concrete slabs. The behaviour of steel fabric and carbon fabric is compared. Although particular differences in fracture behaviour are seen, both types of fabric reinforcement obviate total punch-through and, hence, vastly enhance the protective performance. Comparing the stamping cones and analysing the extent of damage, the protective capacity of different concrete slabs is evaluated. Within the quantitative evaluation of the measurement results, the evolution of strains and strain rates is being considered. On the top side of the concrete slabs, the strain is measured as tensile strain in the first spell after load application, turning into compressive strain later on. The evolution of strains and strain rates indicates wave propagation. Beside the strain results, special attention is paid to the correlation of different measurement techniques. The results of strain gauges, accelerometer, load cells and photogrammetry are contextualised and therefore show the change from the local material behaviour to the global structure response in temporal sequence. 

Cadoni, E; DiPrisco, M; 

978-3-03785-217-0 

3rd International Workshop on Performance, Protection and Strengthening of Structures Under Extreme Loading 

Lugano, SWITZERLAND