IMPROVEMENT OF METABOLISM SEISMIC COLUMN FOR RAPID POST-EARTHQUAKE RESTRATION

Abstract

 The authors have developed a ‘metabolism seismic column’ designed to modify seismic performance under axial force and facilitate rapid restoration post-earthquakes. This metabolism seismic column features a double-layered base structure: The outer layer comprises a replaceable plastic zone intended to absorb seismic energy, while the inner part has a permanent hinge designed to support axial and shear forces under regular conditions. In this study, we improved the metabolism seismic steel column by organizing the functions of the bridge piers in order to improve the recoverability of the bridge structure after earthquakes. We specifically examined the impact of augmenting the axial stiffness of the permanent hinge on the column’s seismic performance and its post-earthquake recoverability using cyclic loading tests. The results indicate that enhancing the axial stiffness of the permanent hinge not only improved the seismic performance of the columns but also aided in post-earthquake restoration. This was attributed to the column’s ability to maintain the position of the upper structure due to the permanent hinge.