Affiliation: | 1Research Scientist, Construction Research Institute, Hanyang Univ., Seoul 133-791, Korea. E-mail: khkim6393@hotmail.com 2Virginia Polytechnic Institute and State Univ., Dept. of Civil and Environmental Engineering, 200 Patton Hall (0105), Blacksburg, VA 24061-0105. E-mail: chema@vt.edu
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