1. Associate Professor, Dept. of Civil Engineering, Colorado State Univ., Mail Stop 1372, Fort Collins, CO 80523-1372 (corresponding author). E-mail: jwv@engr.colostate.edu
2. Associate Professor, Dept. of Wood Science and Engineering, Oregon State Univ., 114 Richardson Hall, Corvallis, OR 97331-5751. E-mail: rakesh.gupta@oregonstate.edu