1. Dept. of Civil Engineering, Jordan Univ. of Science and Technology, 22110 Irbid, Jordan.
2. Institute of Continuum Mechanics, Leibniz Univ. of Hannover, 30167 Hannover, Germany.
3. Dept. of Production Engineering and Management, Technical Univ. of Crete, 73132 Chania, Greece; and Dept. of Civil Engineering, Technical Univ. of Braunschweig, 38106 Braunschweig, Germany (corresponding author).