Initial Evaluation Procedure (IEP) Assessment


Table IEP-2: Initial Evaluation Procedure Step 2

Step 2 – Determination of (%NBS)b
2.1 Determine Nominal (%NBS)LongitudinalTransverse
a) Building Strengthening Data
Has the building been strengthened in this direction?
b) Building Information
Year of Design/Strengthening:
c) Soil Type
From NZS1170.5:2004, Cl 3.1.3:
d) Estimate Period, T
Moment Resisting Concrete Frames: T = max{0.09hn0.75,0.4}
Moment Resisting Steel Frames: T = max{0.14hn0.75,0.4}
Eccentrically Braced Steel Frames: T = max{0.08hn0.75,0.4}
All Other Frame Structures: T = max{0.06hn0.75,0.4}
Concrete Shear Walls: T = max{0.09hn0.75/Ac0.5,0.4}
Concrete Shear Walls: T ≤ 0.4s
User Defined (Input Period)
T=
e) Factor A:
f) Factor B:
g) Factor C:
h) Factor D:
(%NBS)nom = A*B*C*D = %%


Table IEP-2 Initial Evaluation Procedure Step 2 continued

2.2 Near Fault Scaling Factor, Factor E
If T ≤ 1.5s, Factor E = 1LongitudinalTransverse
a) Near Fault Factor, N(T,D) =
b) Factor E:
2.3 Hazard Scaling Factor, Factor F
a) Hazard Factor, Z, for siteLocation:
Z =
Z1992 =
Z2004 =
b) Factor F:
2.4 Return Period Scaling Factor, Factor G
I =
Ro =
c) Return Period Factor, R













R =
d) Factor G:
Ductility Scaling Factor, Factor H
a) Available Displacement Ductility Within Existing Structure μ =
b) Factor Hkμkμ
For pre 1976 (maximum of 2) =
For 1976 onwards =
Factor H:
2.6 Structural Performance Scaling Factor, Factor I
a) Structural Performance Factor, Sp
Tick if light timber-framed construction in this direction
Sp =
b) Structural Performance Scaling Factor = 1/Sp
Factor I:
2.7 Baseline %NBS for Building, %NBSb
(equals (%NBS)nom x E x F x G x H x I )


Table IEP-3 Initial Evaluation Procedure Step 3 (Longitudinal)

Step 3 – Assessment of Performance Achievement Ratio (PAR)
a) Longitudinal Direction
Potential CSWsEffect on Structural PerformanceFactors
3.1 Plan Irregularity:




Factor A:
3.2 Vertical Irregularity:




Factor B:
3.3 Short Columns:




Factor C:
3.4 Pounding Potential
Factor D1: Pounding Effect
Factor D1 For Longitudinal Direction:
Table for Selection of Factor D1SevereSignificantInsignificant
Separation0<Sep<.005H.005<Sep<0.01HSep>0.01H
Alignment of Floors within 20% of Storey Height
Alignment of Floors not within 20% of Storey Height

Factor D2: Height Difference Effect

Factor D2 For Longitudinal Direction:
Table for Selection of Factor D2SevereSignificantInsignificant
Separation0<Sep<.005H.005<Sep<0.01HSep>0.01H
Height Difference > 4 Storeys
Height Difference 2 to 4 Storeys
Height Difference < 2 Storeys
Factor D:
3.5 Site Characteristics
Effect on Structural PerformanceFactor E:
3.6 Other Factors –
Factor F:
3.7 Performance Achievement Ratio (PAR) (equals A * B * C * D * E * F)
Longitudinal:

Table IEP-3 Initial Evaluation Procedure Step 3 (Transverse)

Step 3 – Assessment of Performance Achievement Ratio (PAR)
a) Transverse Direction
Potential CSWsEffect on Structural PerformanceFactors
3.1 Plan Irregularity:




Factor A:
3.2 Vertical Irregularity:




Factor B:
3.3 Short Columns:




Factor C:
3.4 Pounding Potential
Factor D1: Pounding Effect
Factor D1 For Transverse Direction:
Table for Selection of Factor D1SevereSignificantInsignificant
Separation0<Sep<.005H.005<Sep<0.01HSep>0.01H
Alignment of Floors within 20% of Storey Height
Alignment of Floors not within 20% of Storey Height

Factor D2: Height Difference Effect

Factor D2 For Transverse Direction:
Table for Selection of Factor D2SevereSignificantInsignificant
Separation0<Sep<.005H.005<Sep<0.01HSep>0.01H
Height Difference > 4 Storeys
Height Difference 2 to 4 Storeys
Height Difference < 2 Storeys
Factor D:
3.5 Site Characteristics
Effect on Structural PerformanceFactor E:
3.6 Other Factors –
Factor F:
3.7 Performance Achievement Ratio (PAR) (equals A * B * C * D * E * F)
Transverse:

Table IEP-4 Initial Evaluation Procedure Steps 4, 5, 6 and 7

Step 4 – Percentage of New Building Standard (%NBS)LongitudinalTransverse
4.1 Assessed Baseline %NBS (NBS)b
Performance Achievement Ratio (PAR)
PAR * Baseline (%NBS)b
4.4 Percentage New Building Standard (%NBS) – Seismic Rating
Step 5 – Is %NBS < 34?
Step 6 – Potential Earthquake Risk (is %NBS < 67)?
Step 7 – Provisional Grading for Seismic Risk based on IEP
Seismic Grade:

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