MEEMD-Based Ground Vibration Component Extraction and Response Analysis of Long Period Ground Vibration on High-Pier Large-Span Bridges

Abstract

Comparing the empirical modal decomposition (EMD) method and the modified ensemble empirical modal decomposition (MEEMD) method, a response analysis of the long-period components, with the separation and reconstruction of the two methods, and the original long-period ground vibration on high-pier bridges is carried out to verify the validity of the extracted long-period components. In addition, the response characteristics of the components extracted based on the MEEMD and the original ground vibration are studied on the bridges at different points. The results show that, through the correlation of the displacement response of the bridge piers, the long-period component of the long-period ground shaking can well reflect the response characteristics of the long-period ground shaking on the long-period structure, and the MEEMD provides better results than the EMD extraction method. The long-period structure resonates during the long-period component of the long-period ground shaking, the short-period structure resonates during the short-period component, and the structural seismic response is similar to the self-resonance of the structure. The seismic response of the structures is closely related to the self-oscillation period and the spectral parameters of the ground shaking.