논문 상세보기
In order to evaluate the earthquake safety of equipment in structures, it is essential to analyze the In-Structure Response Spectrum (ISRS). The ISRS has a peak value at the frequency corresponding to the structural vibration mode, but the frequency and amplitude at the peak can vary because of many uncertain parameters. There are several seismic design criteria for ISRS peak-broadening for fixed base structures. However, there are no suggested criteria for constructing the design ISRS of seismically isolated structures. The ISRS of isolated structures may change due to the major uncertainty parameter of the isolator, which is the shear stiffness of the isolator and the several uncertainty parameters caused by the nonlinear behavior of isolators. This study evaluated the effects on the ISRS due to the initial stiffness of the bi-linear curve of isolators and the variation of effective stiffness by the input ground motion intensity and intense motion duration. Analyzing a simplified structural model for isolated base structure confirmed that the ISRS at the frequency of structural mode was amplified and shifted. It was found that the uncertainty of the initial stiffness of isolators significantly affects the shape of ISRS. The variation caused by the intensity and duration of input ground motions was also evaluated. These results suggested several considerations for generating ISRS for seismically isolated structures.
1. 서 론
2. 면진구조물 ISRS 평가 방법의 필요성
2.1 고정기초구조물의 ISRS 기준
2.2 면진구조물의 ISRS에 관한 연구 사례
2.3 면진구조물의 ISRS 평가 시 고려사항
3. 면진구조물 모델링 및 입력지진파
3.1 집중질량 모델
3.2 면진장치 이선형(Bi-linear) 모델
3.3 입력지진파
4. 면진구조물의 ISRS 분석
4.1 구조물 주기 이동
4.2 비율에 따른 비선형 해석의 ISRS
4.3 지진세기에 따른 ISRS 변화
4.4 지반운동 강진지속시간에 따른 ISRS 변화
5. 결 론
REFERENCES
