1. Assistant Professor of Civil Engineering, Tamkang Univ., E725, 151 Ying-chuan Rd., Tamsui, Taipei, Taiwan; formerly, Research Assistant, Univ. of Illinois at Urbana-Champaign, Urbana, IL 61801.
2. Professor of Civil Engineering, Univ. of Illinois at Urbana-Champaign, 3129 Newmark Civil Engineering Laboratory, 205 N. Mathews Ave., Urbana, IL 61801.
3. Professor of Civil Engineering, Univ. of Illinois at Urbana-Champaign, USA 3129b Newmark Civil Engineering Laboratory, 205 N. Mathews Ave., Urbana, IL 61801.