1. Assistant Professor, Civil and Environmental Engineering, Louisiana State Univ. and A&M College, Baton Rouge, LA 70803.
2. Associate Professor, School of Architecture and Civil Engineering, Xiamen Univ., Xiamen, Fujian, P.R. China 361005; formerly, Postdoctoral Researcher, Civil and Environmental Engineering, Louisiana State Univ. and A&M College, Baton Rouge, LA 70803 (corresponding author).
3. Professor, Dept. of Structural Engineering, Univ. of California at San Diego, La Jolla, CA 92093.