1. Dept. of Civil, Architectural, and Environmental Engineering, Univ. of Miami, 103 McArthur Engineering Bldg., Coral Gables, FL 33146-0630 (corresponding author).
2. Lester and Gwen Fisher Endowed Scholar, Professor and Chair of the Dept. of Civil, Architectural, and Environmental Engineering, Univ. of Miami, 323 McArthur Engineering Bldg., Coral Gables, FL 33146-0630; Professor, Dept. of Structural Engineering, Univ. of Naples, Federico II, Via Claudio 21, Naples, P.O. Box I-80125, Italy.