1. Professor, Dept. of Civil and Environmental Engineering, Univ. of Wisconsin–Madison, 2314 Engineering Hall, 1415 Engineering, Dr., Madison, WI 53706. E-mail: hanna@engr.wisc.edu
2. Process Manager, Sheet Products and Tubular U.S. Steel, Fairfield Works, Fairfield, AL 35064.
3. Project Engineer, Air Products, formerly graduate student of Dept. of Civil and Environmental Engineering, Univ. of Wisconsin–Madison, Madison, WI 53706.
4. Assistant Professor, Dept. of Civil and Environmental Engineering, Chungnam National Univ., Daejeon, 305-764, South Korea. E-mail: lmjcm@cnu.ac.kr