1. Ph.D. Student, Dept. of Engineering, Univ. of Cambridge, Civil Engineering Bldg., JJ Thompson Ave. 7a, Cambridge CB3 0FA, UK (corresponding author). ORCID: .
2. Associate Professor, Dept. of Engineering Science, Univ. of Oxford, Parks Rd., Oxford OX1 3PJ, UK.
3. Assistant Professor, Dept. of Civil Engineering, Univ. of California, Berkeley, 760 Davis Hall, Berkeley, CA 94720-1710.