1. Professor, Dept. of Civil Engineering, National Taiwan Univ., No. 1 Roosevelt Rd., Sec. 4, Taipei, Taiwan.
2. Professor, Dept. of Finance, National Taiwan Univ., No. 1 Roosevelt Rd., Sec. 4, Taipei, Taiwan.
3. Professor, Dept. of Civil, Construction, and Environmental Engineering, North Carolina State Univ., Mann Hall, Raleigh, NC 27965; formerly, Professor, Dept. of Civil, Construction, and Environmental Engineering, 394 Town Engineering Building, Iowa State Univ., Ames, IA 50011.
4. Dept. of Civil Engineering, National Taiwan Univ., No. 1 Roosevelt Rd., Sec. 4, Taipei, Taiwan; President, Taiwan Structural Engineers Association, 21F-2, NO. 266, Wen Hua Rd., Sec. 1, Pan-Chiao, Taipei Hsien, Taiwan (corresponding author).
5. Ph.D. Student, Dept. of Civil Engineering, National Taiwan Univ., No. 1 Roosevelt Rd., Sec. 4, Taipei, Taiwan.