1. Assistant Professor, Delft Univ. of Technology, Koiter Institute Delft/Faculty of Aerospace Engineering, P.O. Box 5058, NL-2600 GB Delft, The Netherlands.
2. Emeritus Professor, Univ. of Massachusetts, Dept. of Civil and Environmental Engineering, 28, Marston Hall, Amherst, MA 01003.
3. Graduate Research Assistant, Univ. of Massachusetts, Dept. of Civil and Environmental Engineering, 28, Marston Hall, Amherst, MA 01003.