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Table IEP-1 Initial Evaluation Procedure Step 1
As per NZSEE document "Assessment and Improvement of the Structural Performance of Buildings in Earthquake" (incl Corrigendum No.1)
Building Name:
Trentham Racecourse
Ref.: 15224
Location:
10 Racecourse Road
By: LIS
Members Stand
Date: 28 June 2011
Step 1- General Information
1.1 Photos
1.2 Sketch Plan
N
Transverse
Longitudinal
1.3 List of relevant features
Constructed pre 1965, assumed built between 1935-1965
Multi storey concrete building
Appears to be predominately a concrete frame building
Iregular structure
Concrete ramps at the rear and several additions to origibal construction.
Importance Level 3 building as more than 300 people can congregate in one area
1.4 note information sources
Visual Inspection of Exterior
Visual Inspection of Interior
Drawings
Specifications
Geotechnical Reports
Other
NZSEE- IEP Step 1- General Info
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Table IEP-2 Initial Evaluation Procedure Step 2
As per NZSEE document "Assessment and Improvement of the Structural Performance of Buildings in Earthquake" (incl Corrigendum No.1)
Building Name:
Trentham Racecourse
Ref.: 15224
Location:
10 Racecourse Road
By: LIS
Direction Considered: Longitudinal & Transverse
Date: 28 June 2011
Step 1- Determine of (%NBS)b-
2.1 Determine nominal (%NBS) = (%NBS)nom
a) Code
Pre- 1935
1935-1965
&
Yes
1965-1976
Seismic Zone: A
B
C
1976-1992
Seismic Zone: A
B
C
1992-2004
b) Soil Type
from NZS1170.5:2004, Cl3.1.3
A or B Rock
C Shallow Soil
D Soft Soil
Yes
E Very Soft Soil
from NZS4203:1992, Cl 4.6.2.2, Cl3.1.3
a) Rigid
b) Intermediate
c) Estimated Period, T
<0.4
d) %(NBS)nom determined from Figure 3.3
2.77
Note 1:
For buildings designed prior to 1965 and
known to be designed as public buildings in
accordance with the code of the time, multiply
(%NBS)nom by 1.25. For buildings designed
1
1965-1976 and known to be designed as
public buildings in acocordance with the code
of the time, multiply (%NBS)nom by- 1.33-
Zone A, 1.2- Zone B.
Note 2:
For reinforced concrete buildings designed
1
between 1976-84 multiply (%NBS)nom by 1.2
Note 3:
For URM Buidlings designed prior to 1935
(%NBS)nom if
multiply (%NBS)nom by 0.8 except for
1
2.77
revised by notes 1,
Wellington where the factor may be taken as
1.
2 or 3
NZSEE- IEP Step 2- %NBS
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Longitudinal Direction
2.2 NZS4203:1992 Zone Factor For Site
if T £ 1.5sec, Factor A=1
a) Near Fault Factor, N(T,D)
1.00
(from NZS1170.5:2004, Cl 3.1.6)
b) Near Fault Scaling Factor =
1/N(T,D)
1.00
Factor A
2.3 Hazard Fault Scaling Factor, Factor B
a) Hazard Factor, Z, for site
(from NZS1170.5:2004, table 3.3)
0.42
b) Hazard Scaling Factor
For pre 1992 = 1/Z
For 1992 onwards = Z1992/Z
(W here Z1992 is the Zone actor from NZS4203:1992, figure 4.5(b)
2.38
Factor B
2.4 Risk Period Scaling Factor, Factor C
a) Building Importance Level
3
(from NZS1170.0:2004, table 3.1 and 3.2)
b) Return Period Scaling Factor from accompanying Table 3.1
0.8
Factor C
(from NZS4203:1992, Table 4.6.4)
2.5 Ductility Scaling Factor, D
a) Assessed Ductility of Existing Structure, μ
2
(shall be less than maximum given in accompanying Table 3.2)
b) Ductility Scaling Factor
For pre 1992 = kμ
1.57
For 1992 onwards = 1
(W here kμ is NZS1170.5:2004 Ductility Factor, from
accompanying Table 4.3))
1.57
Factor D
2.6 Structural Performance Scaling Factor, Factor E
a) Structural Performance Factor, Sp
0.7
from accompanying Figure 3.4
b) Structural Performance Scaling Factor =
1/Sp
1.43
Factor E
2.7 Longitudinal Direction Baseline (% NBS)b
12
(equals (%NBS)nom x A x B x C x D x E)
NZSEE- IEP Step 2- %NBS
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Transverse Direction
2.2 NZS4203:1992 Zone Factor For Site
if T £ 1.5sec, Factor A=1
a) Near Fault Factor, N(T,D)
1.00
(from NZS1170.5:2004, Cl 3.1.6)
b) Near Fault Scaling Factor =
1/N(T,D)
1.00
Factor A
2.3 Hazard Fault Scaling Factor, Factor B
a) Hazard Factor, Z, for site
(from NZS1170.5:2004, table 3.3)
0.42
b) Hazard Scaling Factor
For pre 1992 = 1/Z
For 1992 onwards = Z1992/Z
(W here Z1992 is the Zone actor from NZS4203:1992, figure 4.5(b)
2.38
Factor B
2.4 Risk Period Scaling Factor, Factor C
a) Building Importance Level
3
(from NZS1170.0:2004, table 3.1 and 3.2)
b) Return Period Scaling Factor from accompanying Table 3.1
0.8
Factor C
(from NZS4203:1992, Table 4.6.4)
2.5 Ductility Scaling Factor, D
a) Assessed Ductility of Existing Structure, μ
2
(shall be less than maximum given in accompanying Table 3.2)
b) Ductility Scaling Factor
For pre 1992 = kμ
1.57
For 1992 onwards = 1
(W here kμ is NZS1170.5:2004 Ductility Factor, from
accompanying Table 4.3))
1.57
Factor D
2.6 Structural Performance Scaling Factor, Factor E
a) Structural Performance Factor, Sp
0.7
from accompanying Figure 3.4
b) Structural Performance Scaling Factor =
1/Sp
1.43
Factor E
2.7 Transverse Direction Baseline (% NBS)b
12
(equals (%NBS)nom x A x B x C x D x E)
NZSEE- IEP Step 2- %NBS
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Table 3.1: Return period scaling factor
NZS1170.5:2004 Return Period Factor R
Return Period Scaling Factor, C
Importance
Annual Probability Return Period
Pre
Comment
1965-76
1976-92
1992-04
Level
of Exceedance
Factor R
1965
Minor structures (failure not likely to
1
1/100
0.5
2
2
2
1.2
endanger human life)
Normal structures and structures not
2
1/500
1
1
1
1
1
failing into other levels
3
Major structures (affecting crowds)
1/1000
1.3
0.8
0.8
1.1
0.9
Post-disaster structures (post-disaster
4
1/2500
1.8
0.6
0.6
1
0.7
functions or dangerous activities)
5
Exceptional structures are outside the scope of the IEP, special study required.
Where R is the return period factor appropriate to the current use of the building, as shown in Table 3.5 of NZS 1170.0:2002
Table 3.2: Ductility factors to be used for existing buildings
Maximum allowable ductility factor for IEP
Structure Type
Pre 1935
1935-1965
1965-1976
1976-2004
All buildings
2
2
2
6
Table 3.3: Ductility scaling factor
Structural Ductility Scaling Factor, ku
1.0 or less
1.25
1.5
2
Soil Type
A,B,C & D
E
A,B,C & D
E
A,B,C & D
E
A,B,C & D
E
Period,T
≤ 0.40s
1
1
1.14
1.25
1.29
1.50
1.57
1.70
0.50s
1
1
1.18
1.25
1.36
1.50
1.71
1.75
0.60s
1
1
1.21
1.25
1.43
1.50
1.86
1.80
0.70s
1
1
1.25
1.25
1.50
1.50
2.00
1.85
0.80s
1
1
1.25
1.25
1.50
1.50
2.00
1.90
≥ 1.00s
1
1
1.25
1.25
1.50
1.50
2.00
2.00
Structural Performance Factor, Sp
1.3
1
pS
0.7
0.4
1
1.5
2
2.5
3
Ductility, μ
Where SP is the Structural Performance Factor form NZS1170.5:2004, Cl 4.4.2.
Figure 3.4: Structural performance factor, SP
Tables 3.1, 3.2, 3.3 & 3.4
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Table IEP-3 Initial Evaluation Procedure Step 3
As per NZSEE document "Assessment and Improvement of the Structural Performance of Buildings in Earthquake" (incl Corrigendum No.1)
Building Name:
Trentham Racecourse
Ref.: 15224
Location:
10 Racecourse Road
By: LIS
Direction Considered:
Longitudinal Direction
Date: 28 June 2011
Step 3- Assessment of Performance Achievement Ration (PAR)
(Refer Appendix B- Section B3.2)
For Factors A to C
Severe
0.4
max
Critical Structural Weakness
Significant
0.7
Insignificant
1
3.1 Plan Irregularity
Effect on Structural Performance
2
0.7
Factor A
Significant
Comment: Due to canopy mass/centre of rigidity offset > 0.3 width
3.2 Vertical Irregularity
Effect on Structural Performance Insignific
3
ant
1.0
Factor B
3.3 Short Columns
Effect on Structural Performance Insignific 3
ant
1.0
Factor C
3.4 Pounding Potential
(Estimate D1 and D2 and set D = the lower of the two or = 1.0 if no potential for pounding)
a) Factor D1 - Pounding Effect
Note: Values given assume the building has a frame structure. For stiff buildings (e.g. with shear walls), the effect
of pounding may be reduced by taking the co-efficient to the right of the value applicable to frame buildings.
Factor D1
1.0
Table for selection of Factor D1
Severe
Significant
Insignificant
Separation
0<Sep<0.005H
.005<Sep<.01H
Sep>.01H
Alignment of Floors within 20% of Storey Height
0.7
0.8
1.0
Alignment of Floors not within 20% of Storey Height
0.4
0.7
0.8
b) Factor D2- Height Difference Effect
Factor D2
1.0
Table for selection of Factor D2
Severe
Significant
Insignificant
Separation
0<Sep<0.005H
.005<Sep<.01H
Sep>.01H
Height Difference > 4 Storeys
0.4
0.7
1.0
Height Difference 2 to 4 Storeys
0.7
0.9
1.0
Height Difference < 2 Storeys
1.0
1.0
1.0
1.0
Factor D
Lesser of D1 and D2
3.5 Site Characteristics- (Stability, landslide threat, liquefaction etc)
Insignific 3
ant
1.0
Factor E
For Factor E
Severe=
0.5
Significant=
0.7
Insignificant=
1
3.6 Other Factors
1.0
Factor F
For ≤3 Storeys - Max value 2.5, otherwise Max value 1.5. No min.
Rationale for choice of Factor F.
No reason to use an enhanced factor.
3.7 Performance Achievement Ratio (PAR)
0.7
(equals A x B x C x D x E x F)
Step 3- Longitudinal
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Table IEP-3 Initial Evaluation Procedure Step 3
As per NZSEE document "Assessment and Improvement of the Structural Performance of Buildings in Earthquake" (incl Corrigendum No.1)
Building Name:
Trentham Racecourse
Ref.: 15224
Location:
10 Racecourse Road
By: LIS
Direction Considered:
Transverse Direction
Date: 28 June 2011
Step 3- Assessment of Performance Achievement Ration (PAR)
(Refer Appendix B- Section B3.2)
For Factors A to C
Severe
0.4
max
Critical Structural Weakness
Significant
0.7
Insignificant
1
3.1 Plan Irregularity
Effect on Structural Performance Insignific 3
ant
1.0
Factor A
3.2 Vertical Irregularity
Effect on Structural Performance Insignific 3
ant
1.0
Factor B
3.3 Short Columns
Effect on Structural Performance Insignific 3
ant
1.0
Factor C
3.4 Pounding Potential
(Estimate D1 and D2 and set D = the lower of the two or = 1.0 if no potential for pounding)
a) Factor D1 - Pounding Effect
Note: Values given assume the building has a frame structure. For stiff buildings (e.g. with shear walls), the
effect of pounding may be reduced by taking the co-efficient to the right of the value applicable to frame
buildings.
Factor D1
1.0
Table for selection of Factor D1
Severe
Significant
Insignificant
Separation
0<Sep<0.005H
.005<Sep<.01H
Sep>.01H
Alignment of Floors within 20% of Storey Height
0.7
0.8
1.0
Alignment of Floors not within 20% of Storey Height
0.4
0.7
0.8
b) Factor D2- Height Difference Effect
Factor D2
1.0
Table for selection of Factor D2
Severe
Significant
Insignificant
Separation
0<Sep<0.005H
.005<Sep<.01H
Sep>.01H
Height Difference > 4 Storeys
0.4
0.7
1.0
Height Difference 2 to 4 Storeys
0.7
0.9
1.0
Height Difference < 2 Storeys
1.0
1.0
1.0
1.0
Factor D
Lesser of D1 and D2
3.5 Site Characteristics- (Stability, landslide threat, liquefaction etc)
Insignific 3
ant
1.0
Factor E
For Factor E
Severe=
0.5
Significant=
0.7
Insignificant=
1
3.6 Other Factors
1.0
Factor F
For ≤3 Storeys - Max value 2.5, otherwise Max value 1.5. No min.
Rationale for choice of Factor F.
No reason to use an enhanced factor.
3.7 Performance Achievement Ratio (PAR)
1
(equals A x B x C x D x E x F)
Step 3- Transverse
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Table IEP- Initial Evaluation Procedure Step 4, 5 and 6
As per NZSEE document "Assessment and Improvement of the Structural Performance of Buildings in Earthquake" (incl Corrigendum No.1)
Building Name:
Trentham Racecourse
Ref.: 15224
Location:
10 Racecourse Road
By: LIS
Date: 28 June 2011
Step 4- Structural Performance Score
Longitudinal
Transverse
4.1 Assessed Baseline (%NBS)b
11.8
11.8
4.2 Performance Achievement Ratio (PAR)
0.70
1.00
4.3 PAR x Baseline (%NBS)b
8.3
11.8
4.4 Percentage New Building Standard (%NBS)
8
Step 5- Potentially Earthquake Prone
%NBS<34
Yes
Step 6- Potentially Earthquake Risk
%NBS<67
Yes
Step 7 Grading for Seismic Risk
Seismic Grade
E
Relationship between Grade and SPS:
Grade:
A+
A
B
C
D
E
%NBS:
>100
100 to 80
80 to 67
67 to 33
33 to 20
<20
Evaluation by………….. ………………….
Name:
Lily Simpson
Reviewed by………….. ………………….
Name: Ignatius Black
CPEng. No:
259219
NZSEE- IEP steps 4, 5, 6 & 7
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