1. Associate Professor, Dept. of Civil and Environmental Engineering, Wonkwang Univ., 460 Iksandae-ro, Iksan, Jeonbuk 570-749, Republic of Korea.
2. Research Assistant, Dept. of Civil and Environmental Engineering, Wonkwang Univ., 460 Iksandae-ro, Iksan, Jeonbuk 570-749, Republic of Korea.
3. Professor and the Fazlur R. Khan Endowed Chair of Structural Engineering and Architecture, Dept. of Civil and Environmental Engineering, ATLSS Engineering Research Center, Lehigh Univ., 117 ATLSS Dr., Bethlehem, PA 18015-4729 (corresponding author).