1. Associate Professor, Dept. of Civil and Environmental Engineering, 400SN, Northeastern Univ., Boston, MA 02115 (corresponding author).
2. Professor, Construction Science Div., Univ. of Oklahoma, 830 Van Vleet Oval, Rm. 162, Norman, OK 73019-6141.
3. Associate Professor, Dept. of Civil, Environmental, and Architectural Engineering, 428 UCB, Univ. of Colorado, Boulder, CO 80309-0428.
4. Formerly, Research Assistant, Dept. of Civil and Environmental Engineering, 400SN, Northeastern Univ., Boston, MA 02115.