1. Univ. Professor, FG Computational Mechanics, Technical Univ. of Munich, Arcisstraße 21, D-80333 Munich, Germany.
2. Univ. Assistant, Institute for Mechanics of Materials and Structures, Vienna Univ. of Technology, Karlsplatz 13/202, A-1040 Vienna, Austria.
3. Engineer, kppk Ziviltechniker GmbH, Castellezgasse 36-38/4a, A-1020 Vienna, Austria.