1. Assistant Professor, Dept. of Architectural Engineering, Dankook Univ., 152 Jukjeon-ro, Gyeonggi-do 448-701, Korea.
2. Graduate Student, Dept. of Architecture and Architectural Engineering, Seoul National Univ., 599 Gwanak-ro, Seoul 151-744, Korea (corresponding author).
3. Professor, Dept. of Architecture and Architectural Engineering, Seoul National Univ., 599 Gwanak-ro, Seoul 151-744, Korea.
4. President, SEN Structural Engineers Co. Ltd, 121-74, Dangsan-dong 6-ga, Yeongdeungpo-gu, Seoul 150-808, Korea.
5. Structural Engineer, SEN Structural Engineers Co. Ltd, 121-74, Dangsan-dong 6-ga, Yeongdeungpo-gu, Seoul 150-808, Korea.