헌치로 보강된 철골모멘트골조의 지진응답 사례연구

A Case Study on Seismic Response of Haunch Repaired Steel MRFs

  • 발행 : 1997.06.01

초록

철골 모멘트 접합부의 보 하부를 헌치로 보강하여 내진성을 크게 향상 시킬 수 있음이 최근의 실물대 보-기둥 "부분골조" 실험을 토하여 확인된 바 있다. 그러나 헌치보강에서 기인할 수 있는 부작용 (side effecs) 또는 보강구조체의 "시스템 레벨"의 거동에 관해서는 현재 잘알려진 것이 없다. 본 연구에서는 헌치보강시 생성되는 이중패널존의 거동을 해석과정에 반영하여 보강구조체의 시스템 레벨의 거동변화를 고찰하였다. 이중패널존의 모델링은 최근에 필자가 제시한 기법을 사용하였으며 1994년 노스리지 지진 당시 접합부 손상을 입은 13층 철골모멘트골조를 대상으로 연구를 수행하였다. 정적/동적 비선형해석에 의해 얻어진 원구조물과 부강구조물의 전체적 응답(global responses)은 큰 차이를 보이지 않았으며 취약층(weak story)의 촉진과 같은 유해한 부작용도 수반되지 않았다.은 유해한 부작용도 수반되지 않았다.

Recent test results of steel moment connections repaired with a haunch on the bottom side of the beam have been shown to be a very promising solution to enhancing the seismic performance of steel moment-resisting frames. Yet, litle is known about the effects of using such a repair scheme on the system seismic performance of structures. To investigate the effects of haunch repair on the system seismic performance, a case study was conducted for a 13-story steel frame building damaged during the 1994 Northridge earthquake. When haunches are incorporated in a steel moment frame, the response prediction is complicated by the presence of "dual" panel zones in the column. A new analytical modeling technique for the dual panel zone recently developed by the author was incorporated in the analysis. Incorporating the behavior of dual panel zone was among the most significant consideration in the analyses. Both the inelastic static and dynamic analyses did not indicate detrimental side effects resulting from the repair.he repair.

키워드

참고문헌

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