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Resistance to point load

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.

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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.

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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 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 General by the factor in the 5% variability column of Variability Factors.

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Clause: 
017_001_002_000_000_000_000_000_000
Clause Number: 
17.1.2
/cop/testing/scope#resistance-point-load
Revision Category: 
0 - Clause Removed
Revision Detail: 

Fixed typos – "serviceability" and "strength".

Draft Clause: 
016_001_002_000_000_000_000_000_000