1. Professor, Dept. of Civil Engineering, Aalborg Univ., Sohngårdsholmsvej 57, 9000 Aalborg, Denmark.
2. Researcher in Civil Engineering, Cowi A/S, Visionsvej 53, 9000 Aalborg, Denmark.
3. Postdoctoral Fellow, Dept. of Civil Engineering, Aalborg Univ., Sohngårdsholmsvej 57, 9000 Aalborg, Denmark (corresponding author).