1. Graduate Research Assistant, Dept. of Civil, Construction and Environmental Engineering, North Carolina State Univ., Box 7908, Raleigh, NC 27695-7908.
2. Dept. of Civil and Environmental Engineering, Center for Earthquake Engineering Simulation, Rensselaer Polytechnic Institute, 110 8th St., JEC 4049, Troy, NY 12180.
3. Dept. of Civil, Construction and Environmental Engineering, North Carolina State Univ., Box 7908, Raleigh, NC 27695-7908.