NCC 2016 Volume One
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Part B1 Structural Provisions (Verification Methods)

Part B1 Structural Provisions (Verification Methods)

VERIFICATION METHODS

BV1 Structural reliability

Compliance with and is verified for the design of structural components and connections when—

(a)

the calculated annual structural reliability index (β), for each action, is not less than that listed in Table BV1.1; and

Table BV1.1 – ANNUAL STRUCTURAL RELIABILITY INDICES (β) FOR STRUCTURAL COMPONENTS AND CONNECTIONS

Importance Level (see Table B1.2a) Permanent and imposed actions Wind, earthquake and snow actions
1 3.8 3.2
2 3.4
3 3.6
4 3.8
Note: The structural reliability indices shown in this table are for primary structural components and connections whose failure could result in collapse of the building, structure or other property. For other structural components and connections, the target structural reliability indices can be reduced by 0.3.
(b)

the annual structural reliability index (β) is calculated in accordance with the following formula:

v1_BV1b1_2015.svg

where—

v1_BV1b2_2015.svg
v1_BV1b3_2015.svg
v1_BV1b4_2015.svg
CQ = correction factor for action; and
CR = correction factor for resistance; and
Qm = mean action; and
Qn = nominal design action; and
Rm = mean resistance; and
Rn = nominal design resistance; and
VQ = coefficient of variation with respect to action; and
VR = coefficient of variation with respect to resistance; and
Φ = capacity factor; and
γ = load factor; and
(c)

the action models for calculation of the structural reliability index are determined in accordance with Table BV1.2; and

(d)

the resistance model for the structural component or connection is established after taking into account variability due to material properties, fabrication and construction processes, and structural modelling.

Table BV1.2 – ACTION MODELS

Importance Level (see Table B1.2a) Permanent action Imposed action Wind action Snow action Earthquake action
Non-cyclonic Cyclonic
Qm
 VQ
 Qm
 VQ
 Qm
 VQ
 Qm
 VQ
 Qm
 VQ
 Qm
 VQ
1 1.00 0.10 0.50 0.43 0.41
 0.52
 0.21
 0.79
 0.32
 0.57
 0.072 1.97
2 1.00 0.10 0.50 0.43 0.34 0.52 0.18 0.79 0.30 0.57 0.054 1.97
3 1.00 0.10 0.50 0.43 0.32 0.52 0.16 0.79 0.28 0.57 0.042 1.97
4 1.00 0.10 0.50 0.43 0.30 0.52 0.14 0.79 0.27 0.57 0.036 1.97

is a means to verify the structural reliability of a structural component or connection in order to meet the requirements of and . For further guidance, refer to the ABCB Handbook for Structural Reliability.

BV2 Structural robustness

Compliance with BP1.1(a)(iii) is verified for structural robustness by—

(a)

assessment of the structure such that upon the notional removal in isolation of—

(i)

any supporting column; or

(ii)

any beam supporting one or more columns; or

(iii)

any segment of a load bearing wall of length equal to the height of the wall,

the building remains stable and the resulting collapse does not extend further than the immediately adjacent storeys; and

(b)

demonstrating that if a supporting structural component is relied upon to carry more than 25% of the total structure a systematic risk assessment of the building is undertaken and critical high risk components are identified and designed to cope with the identified hazard or protective measures chosen to minimise the risk.

is a means to verify the structural robustness of a building or structure in order to meet the requirements of . For further guidance, refer to the ABCB Handbook for Structural Robustness.