노후 철근콘크리트 건물 기둥의 파괴 모드 분류와 변형 능력 예측식 제안

초록

This study addresses the seismic performance of existing reinforced concrete (RC) buildings, which were primarily designed for gravity loadsalone. Assessing the buildings’ seismic capability requires understanding the deformation capacity of the lightly reinforced concrete columnswithin them. The study’s objective is twofold: to establish a procedure for categorizing column failure modes, and to present equations forpredicting deformation capacities based on these failure modes. To achieve this, data from 189 lightly reinforced concrete columns across 53different studies were collected. The effectiveness of the newly proposed failure classification procedure was validated by comparing itsoutcomes to the observed failure modes of the columns. Significantly improved accuracy was demonstrated compared to existing classificationmethods. The study further introduced empirical equations for forecasting column deformation capacity through regression analysis. Theseequations were validated by comparing calculated deformation capacities to actual measurements from column specimens. The empiricalequations proposed in this study showed markedly higher coefficients of determination compared to existing equations proposed by Zhu,Elwood, & Haukaas (2007) and ASCE 41 (2017). This demonstrates that the suggested empirical equations can effectively forecast both thefailure mode and deformation capacity of the lightly reinforced concrete columns.

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