1. Associate Professor, Civil and Environmental Engineering Dept., Villanova Univ., 800 Lancaster Ave., Villanova, PA 19085 (corresponding author).
2. Structural Engineer, Thornton Tomasetti, Newark, NJ 07102; formerly, Research Assistant, Villanova Univ., Villanova, PA 19085.
3. Associate Professor, Civil and Environmental Engineering Dept., Univ. of Delaware, Newark, DE 19716.