Fragility functions are developed that predict the method of repair required for older reinforced concrete beam-column joints damaged by earthquake loading. The results of previous experimental studies are used to develop empirical relationships between damage states and traditional measures of earthquake demand, such as interstory drift, joint deformation, and number of load cycles. Damage states are proposed and linked deterministically with commonly employed MORs; these damage states are characterized by parameters such as concrete crack width, extent of concrete spalling, and yielding and buckling of reinforcement. Probability distributions are fit to the empirical data and evaluated using standard statistical methods. The results of this effort are families of fragility curves that can be used to predict the required method of repair for a damaged joint, as well as a framework for using future experimental data to advance damage assessment of joints.
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