1. Professor, Dept. of Engineering Science and Mechanics, The Pennsylvania State Univ., 212 Earth-Engineering Sciences Bldg., University Park, PA 16802.
2. Professor, Dept. of Architectural Engineering, The Pennsylvania State Univ., 104 Engineering Unit A, University Park, PA 16802.
3. Project Director, Thornton Tomasetti, 51 Madison Ave., New York, NY 10010; formerly, Dept. of Architectural Engineering, The Pennsylvania State Univ., University Park, PA 16802.