Damage Index for Seismic Evaluation of Infill Walls in Reinforced Concrete Frames

This research presents the determination of an appropriate earthquake damage index for infilled masonry walls in reinforced concrete frame structures. The index can be used to determine the level of damage to the infill wall under earthquake loading. The damage index can be obtained from structural analysis of the infilled RC frame with appropriate model for the frame and infill elements using Park-Ang formula. The proposed damage index was calibrated with the test results collected from previous studies. The data used in this study were based on cyclic tests of RC frames with masonry wall subjected to monotonic and horizontal cyclic loads. The behavior of the infilled wall was stimulated using as two equivalent compression-only struts. The analysis results including the displacement and energy dissipation were used to assess the damage occurred to the infilled wall. The proposed damage index can be used in the design and performance assessment of reinforced concrete frames with masonry walls.