1. Associate Professor, Dept. of Estate, Shanghai Univ., 149 Yan-Chang, Shanghai 200072, P.R. China.
2. Professor, Dept. of Civil Engineering, Shanghai Univ., 149 Yan-Chang, Shanghai 200072, P.R. China (corresponding author).
3. Postdoctor, Dept. of Civil Engineering, Shanghai Univ., 149 Yan-Chang, Shanghai 200072, P.R. China.
4. Professor, Division of Fujita Corporation, 243-0125 Ono, Atsugi, Japan.