Fragility Assessment of Damaged Piloti-Type RC Building With/Without BRB Under Successive Earthquakes

연속 지진에 의하여 손상된 필로티 RC 건축물의 BRB 보강 전/후의 취약성 평가

  • Shin, Jiuk (Building Research Dept., Korea Institute of Construction Technology) ;
  • Kim, JunHee (Dept. of Architectural Engineering, Yonsei Univ.) ;
  • Lee, Kihak (Dept. of Architectural Engineering, Sejong Univ.)
  • 신지욱 (한국건설기술연구원 공공건축연구본부) ;
  • 김준희 (연세대학교 건축공학과) ;
  • 이기학 (세종대학교 건축공학과)
  • Received : 2012.10.19
  • Accepted : 2013.03.27
  • Published : 2013.05.02


This paper presents the seismic evaluation and prediction of a damaged piloti-type Reinforced Concrete (RC) building before and after post-retrofitting under successive earthquakes. For considering realistic successive earthquakes, the past records measured at the same station were combined. In this study, the damaged RC building due to the first earthquake was retrofitted with a buckling-restrained brace (BRB) before the second earthquake occurred. Nonlinear Time History Analysis (NTHA) was performed under the scaled intensity of the successive ground motions. Based on the extensive structural response data obtained form from the NTHA, the fragility relationships between the ground shaking intensity and the probability of reaching a pre-determined limit state was were derived. In addition, The the fragility curves of the pre-damaged building without and with the BRBs were employed to evaluate the effect of the successive earthquakes and the post-retrofit effect. Through the seismic assessment subjected to the successive records, it was observed that the seismic performance of the pre-damaged building was significantly affected by the severity of the damage from the first earthquake damages and the hysteresis behavior of the retrofit element.


Damaged Piloti-Type Reinforced Concrete Building;Successive Earthquakes;Buckling-Restrained Brace;Post-Retrofit;Fragility Analysis


Supported by : 한국건설교통기술평가원, 한국연구재단


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