1. Associate Professor, National Univ. of Sciences and Technology, NUST Main Campus, H-12, Islamabad, Pakistan (corresponding author).
2. Graduate Research Assistant, Dept. of Civil and Environmental Engineering, Massachusetts Institute of Technology, 77 Massachusetts Ave., Cambridge, MA 02142; Lyles School of Civil Engineering, Purdue Univ., 550 Stadium Mall Dr., West Lafayette, IN 47907.
3. Assistant Professor, School of Civil Engineering and Geomatics, Universidad del Valle, Cali 760013, Colombia.
4. Professor, Lyles School of Civil Engineering, Purdue Univ., 550 Stadium Mall Dr., West Lafayette, IN 47907.