Affiliation: | 1Senior Research Associate, Dept. of Civil and Environmental Engineering, Box 1831-B, Vanderbilt Univ., Nashville, TN 37235. E-mail: xiaomo.jiang@vanderbilt.edu 2Professor, Dept. of Civil and Environmental Engineering, Box 1831-B, Vanderbilt Univ., Nashville, TN 37235. E-mail: sankaran.mahadevan@vanderbilt.edu
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