1. Dept. of Civil Engineering, South Africa Univ. of Cape Town, Private Bag X3, Rondebosch 7701, South Africa (corresponding author). ORCID: .
2. Professor, Dept. of Civil Engineering, South Africa Univ. of Cape Town, Private Bag X3, Rondebosch 7701, South Africa.
3. Emeritus Professor, Faculty of Engineering and the Environment, Univ. of Southampton, Southampton SO17 1BJ, UK.