1. Associate Research Fellow, National Center for Research on Earthquake Engineering, 200, Section 3, Xinhai Rd., Taipei, Taiwan 10668, Republic of China (corresponding author).
2. Doctoral Candidate, Dept. of Civil Engineering, National Taiwan Univ., No. 1, Section 4, Roosevelt Rd., Taipei, Taiwan 10617, Republic of China.
3. Professor, Dept. of Civil Engineering, National Taiwan Univ., No. 1, Section 4, Roosevelt Rd., Taipei, Taiwan 10617, Republic of China.