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MPA-based IDA Using the Inelastic Displacement ratio, CR and the Collapse Intensity, RC

비탄성변위비와 붕괴강도비를 이용한 MPA기반의 IDA 해석법

  • Received : 2010.05.28
  • Accepted : 2010.08.24
  • Published : 2010.10.31

Abstract

This study develops an approximate procedure for incremental dynamic analysis (IDA) using modal pushover analysis (MPA) with empirical equations of the inelastic displacement ratio ($C_R$) and the collapse strength ratio ($R_C$). By using this procedure, it is not required to conduct linear or nonlinear response history analyses of multi- or single- degree of freedom (MDF) systems. Thus, IDA curves can be effortlessly obtained. For verification of the proposed procedure, the 6-, 9- and 20-story steel moment frames are tested under an ensemble of 44 ground motions. The results show that the MPA-based IDA with empirical equations of $C_R$ and $R_C$ produced accurate IDA curves of the MDF systems. The computing time is almost negligible compared to the exact IDA using repeated nonlinear response history analysis (RHA) of a structure and the original MPA-based IDA using repeated nonlinear RHA of modal SDF systems.

Acknowledgement

Supported by : 한양대 친환경건축센터, 한국연구재단

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