1. Graduate Student, Dept. of Architecture and Architectural Engineering, Seoul National Univ., 1 Gwanak-ro, Seoul 151-744, Korea.
2. Professor, Dept. of Architecture and Architectural Engineering, Seoul National Univ., 1 Gwanak-ro, Seoul 151-744, Korea.
3. General Manager, Shinsegae E&C, 180 Jangchungdan-ro, Seoul 100-391, Korea.
4. Manager, The Naeun Structural Engineering Co. Ltd., 21 Yangpyeong-ro, Seoul 150-105, Korea.
5. Senior Researcher, Building Structure Research Group, POSCO Global R&D Center, 100 Songdogwahak-ro, Incheon 406-840, Korea (corresponding author).