1. Lecturer, School of Planning Architecture and Civil Engineering, Queen’s Univ. Belfast, David Keir Building, Belfast BT9 5AG, Northern Ireland, U.K. (corresponding author).
2. Chair of Structural Materials, School of Planning Architecture and Civil Engineering, Queen’s Univ. Belfast, David Keir Building, Belfast BT9 5AG, Northern Ireland, U.K.
3. Professor, School of Planning Architecture and Civil Engineering, Queen’s Univ. Belfast, David Keir Building, Belfast BT9 5AG, Northern Ireland, U.K.