Phân tích ứng xử của công trình bị hư hại đối với động đất dự đoán sử dụng phân tích mô hình một bậc tự do được xác định từ dữ liệu gia tốc

This study presents a method for analyzing and predicting the seismic response of buildings that have sustained damage during a major earthquake when subjected to future seismic events. The proposed approach is based on an equivalent single-degree-of-freedom (SDOF) model, constructed entirely from recorded floor acceleration data. The method combines the capacity curve extraction method developed by Kusunoki et al. and the method of deriving SDOF model from acceleration data proposed by Pham et al. After the SDOF model is constructed, nonlinear time-history analysis is performed to predict the building's response to a specified ground motion. The method was validated using estimated parameters from experimental data of a full-scale three-story reinforced concrete building tested on E-defense shaking table (Japan). The results show that the error in estimating peak displacement were 4% and 24% compared to the reference displacement determined from displacement response recorded by laser transducers for two considered events, respectively. The proposed method demonstrates strong potential for practical application in rapid post-earthquake assessment and forecasting of structural performance risks, making it suitable for integration into structural health monitoring (SHM) systems.