Load-bearing behavior of thin-walled hollow concrete elements made of high-strength concrete with fine aggregate

Within the DFG Priority Programme 1542 Concrete Light" thin-walled hollow concrete elements were designed and tested under predominant normal force at the concrete construction department at the TU Braunschweig. The elements are based on the bionic example of bamboo, whose astonishing features are widely used in Asia's building industry and in this case transferred into concrete elements. The selected high-strength concrete with fine aggregate and the examined innovative reinforcement concepts are used to produce bionic hollow concrete elements with wall thicknesses of only 2.5 to 3.0 cm in very high quality. Using experiments under eccentric normal forces, it could be shown that the failure mechanisms of thin-walled components as well as the achieved failure stresses and thus the utilization of the concrete compressive strength are significantly determined by the reinforcement concept and the reinforcement configuration used. Due to the very high deformation ability of the investigated high-strength concrete - in case of very thin-walled concrete elements under predominant normal force - the consideration of concrete properties can not be limited to the compressive strength and needs to be extended to the stress-strain behavior.