1. Department of Civil and Environmental Engineering, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, PR China
2. Department of Civil and Environmental Engineering, Hong Kong Polytechnic University, Hung Hum, Kowloon, Hong Kong, PR China; formerly Department of Civil and Environmental Engineering, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, PR China