1. Fraunhofer Institute for Mechanics of Materials, Woehlerstr. 11, 79108 Freiburg, Germany
2. Fraunhofer Institute for Wind Energy Systems, Merkurstr. 13, 30419 Hannover, Germany
3. Test Center Support Structures, Faculty of Civil Engineering and Geodetic Science, Leibniz University Hannover, Merkurstr. 13, 30419 Hannover, Germany