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Shock and Vibration
Volume 2017 (2017), Article ID 5184790, 20 pages
Research Article

Seismic Fragility Estimates of LRB Base Isolated Frames Using Performance-Based Design

1Department of Civil Engineering, Birjand University of Technology, Birjand 97175-569, Iran
2School of Civil Engineering, Iran University of Science and Technology, Tehran 16765-163, Iran
3Department of Civil and Environmental Engineering, Incheon National University, 12-1 Songdo-dong, Yeonsu-gu, Incheon 406-840, Republic of Korea
4Head of Center, Incheon Disaster Prevention Research Center, Incheon National University, 12-1 Songdo-dong, Yeonsu-gu, Incheon 406-840, Republic of Korea
5Department of Civil Engineering, Shahid Bahonar University of Kerman, Kerman 76169133, Iran
6Pooya Sazeh Koohin Co., Ltd., Tehran 18718-13553, Iran

Correspondence should be addressed to Jong Wan Hu

Received 29 November 2016; Revised 12 February 2017; Accepted 19 February 2017; Published 11 April 2017

Academic Editor: Longjun Dong

Copyright © 2017 Iman Mansouri et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


With improving technology, the idea of using energy dissipater equipment has been strengthened in order to control the structures response in dynamic loads such as wind and earthquake. In this research, we dealt with seismic performance of base isolated structures with lead-rubber bearing (LRB) using incremental dynamic analysis (IDA). For this purpose, 3- and 9-story buildings have been utilized in the SAC project undergoing 22 earthquake records which were far-fault. Plotting the fragility curve for various states of design time period and isolator damping of LRB, it is observed that, by increasing damping, the isolator has not been activated in small spectrum acceleration, which shows that the annual exceedance probability is increased in immediate occupancy (IO) performance level and decreased in life safety (LS) performance level. The results show the reduction of determined failure probability in fragility curves for two levels of performance of uninterrupted use and lateral safety. Likewise obtained results show that, with increasing design time period of isolator, the amount of failure probability is decreased rather than the isolator with smaller design time period, for both LS and IO states. And the isolator illustrates better performance.