1. Postdoctoral Fellow, Dept. of Civil Eng., Univ. of New Mexico, Albuquerque, NM 87131.
2. Research Assistant, Dept. of Civil Eng., Univ. of New Mexico, Albuquerque, NM 87131.
3. Assistant Professor, Dept. of Civil Eng., Assiut Univ., Assiut 71516, Egypt.
4. Professor and Chair, Dept. of Civil Eng., Univ. of New Mexico, Albuquerque, NM 87131 (corresponding author).