1. Timber Research Engineer, Dept. of Civil and Natural Resources Engineering, Univ. of Canterbury, Private Bag 8400, Christchurch 8140, New Zealand (corresponding author).
2. Associate Professor, Dept. of Civil and Natural Resources Engineering, Univ. of Canterbury, Private Bag 8400, Christchurch 8140, New Zealand.
3. Professor, Dept. of Civil and Natural Resources Engineering, Univ. of Canterbury, Private Bag 8400, Christchurch 8140, New Zealand.