논문 상세보기
Seismic demand on nonstructural components (NSCs) is highly dependent on the coupled behavior of a combined supporting structure- NSC system. Because of the inherent complexities of the problem, many of the affecting factors are inevitably neglected or simplified based on engineering judgments in current seismic design codes. However, a systematic analysis of the key affecting factors should establish reasonable seismic design provisions for NSCs. In this study, an idealized 2-DOF model simulating the coupled structure-NSC system was constructed to analyze the parameters that affect the response of NSCs comprehensively. The analyses were conducted to evaluate the effects of structure-NSC mass ratio, structure, and NSC nonlinearities on the peak component acceleration. Also, the appropriateness of component ductility factor (R p) given by current codes was discussed based on the required ductility capacity of NSCs. It was observed that the responses of NSCs on the coupled system were significantly affected by the mass ratio, resulting in lower accelerations than the floor spectrum-based response, which neglected the interaction effects. Also, the component amplification factor (a p) in current provisions tended to underestimate the dynamic amplification of NSCs with a mass ratio of less than 15%. The nonlinearity of NSCs decreased the component responses. In some cases, the code-specified R p caused nonlinear deformation far beyond the ductility capacity of NSCs, and a practically unacceptable level of ductility was required for short-period NSCs to achieve the assigned amount of response reduction.
2. 현행 기준 및 선행연구 분석
2.1 현행 기준의 비구조요소 수평설계지진력
2.2 선행연구 분석
3. 구조물-비구조요소 결합시스템 모델링 및 수치해석
3.1 운동방정식 유도
3.2 수치해석
3.3 입력지진
4. 구조물-비구조요소 상호작용 효과 분석
4.1 운동방정식에 의한 층응답스펙트럼법 평가
4.2 주요 동특성이 상호작용 효과에 미치는 영향
5. 비구조요소 내진설계계수 평가
5.1 비구조요소 증폭계수(ap) 평가
5.2 비구조요소 반응수정계수(Rp) 평가
6. 결 론
REFERENCES
