Report - PEER - University of California, Berkeley

deterioration. These are the type of reinforcing bars (plain or deformed), compressivestrength of concrete, and the transverse reinforcement ratio (confinement).Normalized Dissipated Energy1.00.80.60.40.2CLASSSLCLASSMDCLASSSV0.01 2 3 4 5 6 7 8 9 10Number of Cycles (n)Figure 3. Variation of normalized dissipated energy (Ē h,n ) per cycle vs. thenumber of cycles (n) for each specimen in Table 1.Concrete strength, type of reinforcing bars and the amount of confinementimplemented in construction are easily identifiable parameters for an existingbuilding. A decision chart indicating the level of deterioration can be designed basedon the range of values for these three parameters. Table 2 presents the proposeddecisions for slight, moderate and severe levels of deterioration. The values on the leftin each cell are for deformed bars, and those in parentheses are for plain bars. Thelevels printed in bold are the ones conforming to the experimental results of Table 1.Table 2. Decision chart for the levels of strength deteriorationConcrete Strength (MPa)Confinement Ratio (%)≤ 0.5 0.5 –1.0 ≥ 1.0≤ 15 SV (SV) MD (SV) NA15-25 SV (SV) MD (SV) SL (MD)≥ 25 MD (NA) MD (MD) SL (MD)NA: Not applicable in practiceSENSITIVITY OF INELASTIC AND RESIDUAL DISPLACEMENTS TODETERIORATION LEVELThe influence of the level of deterioration on inelastic and residual displacements isdemonstrated by calculating the displacement time histories of a SDOF system that426