耐力劣化を考慮した鉄筋コンクリート構造超高層骨組の巨大地震に対する崩壊クライテリア

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Risks of severe earthquake have high probability to induce collapse potentials of existing structures, especially for existing high-rise buildings subjected to long-period ground motions (LPGMs). The effect of strength and stiffness deterioration of the components on the seismic performance and collapse capacity of existing RC high-rise moment-resisting frames (MRF) is addressed in this paper. According to time history incremental dynamic analysis (IDA) on RC high-rise MRF models incorporating various deterioration levels, significant influences on seismic responses and collapse criteria are obtained. The aleatory uncertainty (record-to-record variability) could not be considered with one-dimension that is based on an assumption that the collapse capacity is judged based on a constant engineering demand parameter for a certain structure, but needs to be considered on two-dimensions of intensity measure and earthquake demand parameter (intensity measure (IM), engineering demand parameter (EDP)). As one parameter of the epistemic uncertainty, strength and stiffness deterioration of RC component clearly shows primary influence on collapse criteria of RC high-rise MRF models, and for the method of IDA, intellective process that increment should be decreased when IM increases at a sensitive level. This study provides assessment criteria on the collapse capacity of RC high-rise buildings incorporating the effect of strength and stiffness deterioration.
2012-07-15

耐力劣化を考慮した鉄筋コンクリート構造超高層骨組の巨大地震に対する崩壊クライテリア

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