COP v3.0:testing; scope

17.1 Scope 

This section provides the methodology to demonstrate that sheet roof and wall cladding complies with the requirements described in Stucture.
 

17.1.1 Allowance for variability of materials 

Provision is made in 17.1.1A Variability Factors for the testing of more than one sample of a test specimen to allow for variability of materials. If many tests are carried out, each sample is required to satisfy the performance criteria. Where various tests are conducted on pierce-fixed roofs at different span lengths, using the same profile, type, and thickness of cladding, fastening type and pattern, and they have the same mode of failure, they must be included as complying with the number of units in 17.1.1A Variability Factors.

Where only static testing is conducted and cyclic test verification testing is not used, the variability factors must be strictly in accordance with 17.1.1A Variability Factors.

The design capacity (R d ) must satisfy

R d < R min / k t where R min is the minimum test value and the factor k t is given in 17.1.1A Variability Factors.

17.1.1A Variability Factors

No units to
be tested
Coefficient of variation
 5%10%15%20%
11.201.461.792.21
21.171.381.641.96
31.151.331.561.83
41.151.301.501.74
51.131.281.461.67
101.101.211.341.49
Factor(kt) to allow for variability of structural units.

NOTE: For values between those listed in the table interpolation may be used.

It is recommended that the Coefficient of variation is established by using the standard deviation method.

17.1.2 Resistance to point load 

17.1.2A General

The point load requirements of this section of this standard classify roof and wall cladding as:

Type 1: Areas that can be accessed from opening windows or awnings. This classification is intended to allow for people gathering to watch a parade or similar situations.
Type 2: Areas that require access for maintenance purposes. Type 2 is for all other roofs that are readily accessible and it divided into two categories.
  • Type A is unrestricted access, where a person may walk anywhere on the roof cladding.
  • Type B is restricted access, where access is restricted to walking within 300 mm of the purlin line or in the pan of the profile.

Type 3: Areas for which support ladders or boards are required for maintenance access (including transparent surfaces) 0.5 kN.

Type 3, No Access' Roofs that are not readily accessible which include, plastic sheeting, roof surfaces with a pitch of more than 35°, or that are regarded as unsafe or unable to be walked or worked on without special provisions being made. Walls are included in this category.

17.1.2B Serviceability Test

When subjected to a point test load as prescribed in this section none of the following must occur :

  • Permanent local deformation (except within residual deflection limits).
  • De-indexing or unclipping.
  • Fracture or failure of any part of the cladding.
  • Fastener failure.

The residual deflection under the point of application of the load within a minimum of 1 minute after removal of the load must not exceed S/400.

For Type A access the concentrated load must be applied to those parts of the cladding which will produce maximum deflection and maximum permanent deformation.

For Type B access the concentrated load must be applied to the pan of the profile at mid-span or any part of the cladding within 300 mm of the purlin line. Where the pan of the profile is less than 100 mm wide, any point load must be spread over two or more ribs.

17.1.2C Strength Test

When any part of the cladding for Type 2A & B, is subjected for not less than 1 minute to a concentrated test load for strength limit state in accordance with 17.5 Determining Wind load Span Graphs, the load must be sustained, irrespective of any permanent deformation that may occur.

Where it is intended to conduct a series of tests, the point load is determined by multiplying the load given in 17.1.2A General by the factor in the 5% variability column of 17.1.1A Variability Factors.

17.1.3 Resistance for wind pressures 

17.1.3A Serviceability Test

 

When the cladding system is subjected to the Uniformly Distributed Load (UDL) test load as prescribed in 17.7 Wind and Point Load Testing none of the following must occur:

Permanent local deformation (except within residual deflection limits).

De-indexing or unclipping.

Fracture or failure of any part of the cladding.

Fastener Failure.

17.1.3B Strength Test

When the cladding system is subjected to the test pressure for strength limit state (as specified in Wind and Point Load Testing), the pressure must be sustained, notwithstanding any permanent distortion that might occur in the sheeting and fastenings.

Type A:
Unrestricted access, where a person may walk anywhere on the roof cladding.

Type B:
Restricted access, where access is restricted to walking within 300 mm of the purlin line or in the pan of the profile.

Type 3:
Areas for which support ladders or boards are required for maintenance access (including transparent surfaces) 0.5 kN.

Type 3, no Access':
Roofs that are not readily accessible which include plastic sheeting, roof surfaces with a pitch of more than 35°; or that are regarded as unsafe or unable to be walked or worked on without special provisions being made. Walls are included in this category.