1. Assistant Professor, Dept. of Civil, Environmental and Architectural Engineering, Univ. of Colorado at Boulder, Boulder, CO 80309; formerly, Research Scientist and Project Engineer, George E. Brown Network for Earthquake Engineering Simulation (NEES), Univ. at Buffalo, The State Univ. of New York, Buffalo, NY 14260.
2. Clifford C. Furnas Professor of Structural Engineering, Dept. of Civil, Structural and Environmental Engineering, Univ. at Buffalo, The State Univ. of New York, Buffalo, NY 14260 (corresponding author).