Consistent damage model and performance-based assessment of structural members of different materials

Structural members of different materials in composite structures have different seismic damage performances. Consequently, a unified standard is required to evaluate the performance levels of structural members of a composite structure in order to determine the behavior and the damage process from member-level to structure-level. Based on the classical Park-Ang damage model, a consistent modification of that model is proposed for structural members of different materials. Furthermore, the specific limit values of this damage model at various performance levels are calculated. Obvious differences have been found between the limit values of different types of members. In order to unify the damage limits that correspond to predefined performance levels such that a comparison between different members can be made directly, normalizing parameters for the different types of members are introduced to build the unified damage model. The finite element method utilizing the proposed damage model and performance levels produces results in good agreement with those of testing.