1. Professor, Dept. of Engineering Technology, Univ. of North Texas, Denton, TX 76207 (corresponding author).
2. Ph.D. Candidate, Dept. of Structural Engineering, Tongji Univ., Shanghai 200092, China.
3. Graduate Research Assistant, Dept. of Engineering Technology, Univ. of North Texas, Denton, TX 76207.
4. Graduate Research Assistant, Dept. of Civil Engineering, Tsinghua Univ., Beijing 100083, China.