1. Prof., Dept. of Civ. Engrg., Hochschule für Technik, Wirtschaft und Kultur Leipzig (FH), PF 66, 04251 Leipzig, Germany; formerly, Res. Assoc., Dept. of Civ., Envir., and Arch. Engrg., Univ. of Colorado at Boulder, Boulder, CO 80309-0428. E-mail: slowik@fbb.htwk-leipzig.de
2. Prof., Dept. of Civ., Envir., and Arch. Engrg., Univ. of Colorado at Boulder, Boulder, CO. E-mail: saouma@bechtel.colorado.edu