Ph.D. Student, Dept. of Civil and Environmental Engineering, Faculty of Engineering, Univ. of Auckland, 20 Symonds St., CBD, Private Bag 92019, Auckland 1142, New Zealand (corresponding author). Email: ; Lecturer, Dept. of Civil and Environmental Engineering, Faculty of Engineering, Univ. of Auckland, 20 Symonds St., CBD, Private Bag 92019, Auckland 1142, New Zealand. Email: Professor of Timber Design, Dept. of Civil and Environmental Engineering, Faculty of Engineering, Univ.