1. Associate Professor, Dept. of Civil, Environmental, and Architectural Engineering, Univ. of Colorado, UCB 428, Boulder, CO 30309-0428. E-mail: paul.chinowsky@colorado.edu
2. Professor, Dept. of Civil, Environmental, and Architectural Engineering, Univ. of Colorado, UCB 428, Boulder, CO 30309-0428. E-mail: james.diekmann@colorado.edu