1. Dept. of Civil & Environmental Engineering, Univ. of Wisconsin–Madison, 1415 Engineering Drive, Madison, WI 53706.
2. Dept. of Civil & Environmental Engineering, Univ. of Wisconsin–Madison, 1415 Engineering Drive, Madison, WI 53706 (corresponding author).
3. Dept. of Civil and Disaster Prevention Engineering, National United Univ., 1 Lien-Kung, Miaoli, 36003 Taiwan, R.O.C.
4. Dept. of Bioenvironmental Systems Engineering, National Taiwan Univ., 1, Section 4, Roosevelt Road, Taipei, 10617 Taiwan, R.O.C.