Performance Objectives (KANEPE)

According to KANEPE section 2.2, the objectives of the assessment or redesign (Table 2.1) consist of combinations of both a performance level and a seismic action, given an "acceptable probability of exceedance within the life cycle of the building" (design earthquake), as shown in Table 2.1 of KANEPE below.

The target building performance levels refer to the state of damage in the structure defined through three limit states, namely Immediate Occupancy (A), Life Safety (B) and Collapse Prevention (C).

Note: As structural systems of Type 1 are denoted structures with low ductility (e.g. buildings constructed prior to 1985 or buildings whose capacity curve is characterized by an available displacement ductility which is lower than 2), that are expected to have inferior hysteretic behaviour than structures with high ductility which are characterised as Type 2 systems, e.g. buildings constructed after 1985, or buildings whose capacity curve is characterized by an available displacement ductility which is higher than 2. Given the fact that the influence of hysteretic behaviour is greater for higher levels of post-elastic structural response, the values of the coefficient C2 are conditioned to the performance level.

Performance Level of Immediate Occupancy (A)
The Immediate Occupancy after the earthquake (A), according to KANEPE, is a condition in which it is expected that no building operation is interrupted during and after the design earthquake, with the possible exception of minor importance functions. A few hairline crack may occur in the structure.

Performance Level of Life Safety (B)
The Life Safety (B), according to KANEPE, is a condition in which repairable damage to the structure is expected to occur during the design earthquake, without causing loss or serious injury of people and without substantial damage to personal property or materials that are stored in the building.

Performance Level of Collapse Prevention (C)
The Collapse Prevention (C), according to KANEPE, is a condition in which extensive and serious or severe (non-repairable, in general) damage to the structure is expected during the design earthquake; however, the structure retains its ability to bear the prescribed vertical loads (during and for a period after the earthquake), but without other substantial safety factor against total or partial collapse.

The choice of which Performance Objectives will be checked may be found in KANEPE.