1. Associate Professor, Dept. of Civil and Engineering Mechanics, Univ. of Arizona, Tucson, AZ 85721-0072.
2. Engineer, Parsons Brinkerhoff, Tempe, AZ 85282.
3. Res. Asst., Dept. of Civ. and Eng. Mech., Univ. of Arizona, Tucson, AZ 85721-0072.
4. Engineer, Pinnacle Engineering, Houston, TX 77063.