[1]College of Civil Engineering & Architecture Changzhou Institute of Technology Changzhou 213002 China;
[2]State Key Laboratory of Water Resources and Hydropower Engineering Science Wuhan University Wuhan 430072 China;
[3]Department of Civil and Environmental Engineering National University of Singapore 12 Kent Ridge Road 119221 Singapore;
[4]School of Civil Engineering Central South University Changsha 410075 China;