1. Postdoctoral Researcher, School of Engineering (C5), Univ. of Surrey, Guildford, Surrey GU2 7XH, U.K. (corresponding author).
2. Lecturer in Structural Engineering, School of Engineering (C5), Univ. of Surrey, Guildford, Surrey GU2 7XH, U.K.
3. Professor of Structural Systems, School of Engineering (C5), Univ. of Surrey, Guildford, Surrey GU2 7XH, U.K.