1. Associate Professor, Dept. of Civil Engineering, Shandong Institute of Architecture & Engineering, Jinan 250014, China (corresponding author).
2. Professor, Dept. of Civil Engineering, Univ. of Science and Technology of Suzhou, Suzhou 215011, China.
3. Professor, Dept. of Civil Engineering, Shandong Institute of Architecture and Engineering, Jinan 250014, China.