1. Graduate Research Assistant, Civil, Environmental, and Architectural Engineering Dept., Univ. of Kansas, 1530 W. 15th St., Lawrence, KS 66045-7609.
2. Professor, Civil, Environmental, and Architectural Engineering Dept., Univ. of Kansas, 1530 W. 15th St., Lawrence, KS 66045-7609 (corresponding author).
3. Professor, Civil, Environmental, and Architectural Engineering Dept., Univ. of Kansas, 1530 W. 15th St., Lawrence, KS 66045-7609.