1. Graduate Student, Dept. of Civil Engineering, Technical Univ. of Denmark, Brovej Building 118, DK-2800 Kgs Lyngby, Denmark (corresponding author).
2. Professor, Dept. of Civil Engineering, Technical Univ. of Denmark, Brovej Building 118, DK-2800 Kgs Lyngby, Denmark.
3. Associate Professor, Dept. Civil Engineering, Technical Univ. of Denmark, Brovej Building 118, DK-2800 Kgs Lyngby, Denmark.