Method for evaluating seismic capacity of rc member based on coupling frequency and apparent damage

Abstract

The application relates to the field of building structure seismic evaluation, and discloses a reinforced concrete (RC) component seismic capacity evaluation method based on coupling frequency and apparent damage, which comprises the following steps: acquiring initial design parameters to determine the physical parameters of a component section; extracting a first-order modal frequency of a dynamic response signal of a damaged RC component to calculate a first-order modal frequency change rate; extracting the geometric features of a local spalling area of concrete in a blast-facing surface image to construct a local damage correction coefficient; inputting the initial design parameters and the first-order modal frequency change rate into a prediction model to calculate a benchmark residual seismic capacity coefficient; using the local damage correction coefficient to reduce the calculation to obtain a final coupling residual seismic capacity coefficient; and comparing the final coupling residual seismic capacity coefficient with a preset threshold to determine a damage grade. The first-order modal frequency change rate representing the stiffness degradation of the component and the local damage correction coefficient quantifying the local energy consumption weakening are coupled and operated, the defect that a single dynamic index is not sensitive to local damage is made up, and the evaluation accuracy is improved.

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