Affiliation: | 1Associate, Schnabel Engineering Associates, Inc., 510 East Gay St., West Chester, PA?19380. 2Professor, Dept. of Civil and Environmental Engineering, Virginia Polytechnic Institute and State Univ., Blacksburg, VA?24061-0105 (corresponding author). 3Research Civil Engineer, U.S. Army Engineers Research and Development Center, Information Technology Lab, 3909 Halls Ferry Rd., Vicksburg, MS?39180.
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