1. Ph.D. Student, Dept. of Civil Engineering, Univ. of Minnesota, 500 Pillsbury Drive SE, Minneapolis, MN 55455 (corresponding author).
2. James L. Record Professor, Dept. of Civil Engineering, Univ. of Minnesota, 500 Pillsbury Drive SE, Minneapolis, MN 55455.
3. Professor, Dept. of Civil Engineering, Case Western Reserve Univ., 10900 Euclid Ave., Cleveland, OH 44106-7201.
4. Assistant Professor, Dept. of Civil Engineering, Case Western Reserve Univ., Bingham Building, Room 208, 10900 Euclid Ave., Cleveland, OH 44106-7201.
5. Assistant Professor, Dept. of Structural Engineering, Politecnico di Milano, P.za L. Da Vinci 32, 20133 Milano, Italy.