Structural overall damage index based on structural strain energy

Abstract

In order to accurately evaluate the overall damage degree of a structure after an earthquake and provide guidance for structural reinforcement and repair, it is crucial to develop a reasonable damage model that can effectively describe the structural overall damage. This has been a focal point of research in the field of seismic engineering. Structural strain energy (SSE) is a parameter that can sensitively reflect the damage condition of the entire structure. Therefore, based on SSE and considering the coupling effect of the first transcendental failure and cumulative hysteretic energy dissipation, a structural overall damage index is derived through theoretical analysis. This index aims to capture the extent of damage based on SSE. To validate the credibility of the proposed damage index, a 60-story truss frame-core tube structure model with outrigger (TCO), measuring 237.60 m in height, is selected as an example. Six representative damage indices are chosen for comparison purposes. The nonlinear dynamic characteristics of the entire structure are analyzed using incremental dynamic analysis (IDA). Additionally, the seven damage indices, including the code-specified values, are compared to verify the credibility and applicability of the proposed structural overall damage index.