1. Senior Research Associate, Charles E. Via Jr. Dept. of Civil Engineering, Virginia Polytechnic Institute and State Univ., Blacksburg, VA 24061-0105. E-mail: hildreth@vt.edu
2. David H. Burrows Professor of Construction Engineering and Management, Charles E. Via Jr. Dept. of Civil Engineering, Virginia Polytechnic Institute and State Univ., Blacksburg, VA 24061-0105. E-mail: mikev@vt.edu
3. Associate Professor, Charles E. Via Jr. Dept. of Civil Engineering, Virginia Polytechnic Institute and State Univ., Blacksburg, VA 24061-0105. E-mail: julio@vt.edu