| Title |
Classifying Failure Modes and Proposing Deformation Capacity Prediction Equations for Lightly Reinforced Concrete Columns in Aging Buildings |
| Authors |
구수현(Koo, Su-hyun) ; 한상환(Han, Sang Whan) |
| DOI |
https://doi.org/10.5659/JAIK.2023.39.8.215 |
| Keywords |
Failure mode; Older reinforced concrete buildings; Flexure failure; Shear failure; Deformation capacity; Empirical equation |
| Abstract |
This study addresses the seismic performance of existing reinforced concrete (RC) buildings, which were primarily designed for gravity loads
alone. Assessing the buildings’ seismic capability requires understanding the deformation capacity of the lightly reinforced concrete columns
within them. The study’s objective is twofold: to establish a procedure for categorizing column failure modes, and to present equations for
predicting deformation capacities based on these failure modes. To achieve this, data from 189 lightly reinforced concrete columns across 53
different studies were collected. The effectiveness of the newly proposed failure classification procedure was validated by comparing its
outcomes to the observed failure modes of the columns. Significantly improved accuracy was demonstrated compared to existing classification
methods. The study further introduced empirical equations for forecasting column deformation capacity through regression analysis. These
equations were validated by comparing calculated deformation capacities to actual measurements from column specimens. The empirical
equations 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 the
failure mode and deformation capacity of the lightly reinforced concrete columns. |