1. Research Assistant, Department of Civil, Architectural, and Environmental Engineering, Missouri Univ. of Science and Technology, Rolla, MO 65409, US, e-mail: xkb4c@mst.edu
2. Research Assistant, Department of Mechanical and Aerospace Engineering, Missouri Univ. of Science and Technology, Rolla, MO 65409, US, e-mail: ycbm7@mst.edu
3. Associate Professor, Department of Civil, Architectural, and Environmental Engineering, National Taiwan Univ., Taipei, TW, e-mail: louisge@ntu.edu.tw