1. Ph.D. Candidate, Dept. of Civil Engineering, Johns Hopkins Univ., Baltimore, MD 21205 (corresponding author).
2. Professor, Dept. of Civil Engineering, Johns Hopkins Univ., Baltimore, MD 21205.
3. Professor, Conservatoire National des Arts et Métier, Paris, 75003, France.
4. Researcher, Univ. degli Studi di Catania, Catania, 95131, Italy.