1. Post-Doctoral Fellow, Department of Civil and Environmental Engineering, Colorado School of Mines, Golden, CO 80401, US, e-mail: ydong@mines.edu
2. Professor, Department of Civil and Environmental Engineering, Colorado School of Mines, Golden, CO 80401, US, e-mail: ninglu@mines.edu
3. Associate Teaching Professor, Department of Civil and Environmental Engineering, Colorado School of Mines, Golden, CO 80401, US, e-mail: awayllac@mines.edu
4. Assistant Professor, Department of Civil and Environmental Engineering, Colorado School of Mines, Golden, CO 80401 US, e-mail: ksmits@mymail.mines.edu