비탄성요구스펙트럼의 작성을 위한 강도감소계수 공식의 비교 평가
Comparative Evaluation of Formulas of Strength Reduction Factors for the Generation of an Inelastic Demand Spectrum
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초록
비탄성요구스펙트럼의 형상은 구조물의 내진성능평가 결과에 많은 영향을 미친다. 비탄성요구스펙트럼은 강도감소계수를 적용하여 탄성응답스펙트럼을 비례축소시킴으로써 얻어질 수 있다. 이 연구는 기존에 많은 연구자들이 제안한 강도감소계수의 공식을 조사하였다. 이 논문에는 과거에 제안된 공식에 따라 작성된 강도감소계수 곡선과 비탄성요구스펙트럼 곡선의 형상 및 특성을 비교하고 있다. 조사된 공식으로 작성된 강도감소계수 곡선의 평균곡선을 구하고, 회귀분석을 통하여 평균 곡선의 공식을 유도하였다. 비교 연구를 통하여, 새롭게 제안된 강도감소계수 공식에 따라 작성된 비탄성요구스펙트럼의 형상은 기존에 제안된 공식으로 생성한 비탄성요구스펙트럼의 평균곡선과 일치함을 확인하였다.
Abstract
The shape of an inelastic demand spectrum may have a major impact on the seismic evaluation results of a structure. The inelastic demand spectrum could be obtained by scaling down from the elastic response spectrum by applying the strength reduction factor (SRF). This study has investigated formulas for SRFs that were suggested by numerous previous studies. This paper compares their characteristics, including the shapes of the curves of the SRFs and the inelastic demand spectra that were produced by applying the various formulas for SRFs. The mean curve was computed from the SRF curves generated by the various formulas. This study derives a new formula for the SRF curve through regression analysis. From the comparative study, it is shown that the proposed formula for the SRF can generate the mean curve of the inelastic demand spectra which have been previously suggested by others.
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