fischer fixing-systems main-catalogue Page 662
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Basic knowledge of fastening technology Assessment procedure. Fasteners which are not covered by a harmonised standard (hEN) can apply for an ETA (European Technical Assessment) on the basis of a European Assessment Document (EAD). Section 6 of the ETAG 001 (in the future, EAD 33-0747) regulates the assessment of metal fixings in cracked and non-cracked concrete for multiple use for non-structural systems. Non-load bearing systems include components which do not contribute to the stability of the construction, they only transmit their dead or wind load. These are, for instance, simple suspended ceilings and false ceilings, pipelines and façade claddings. When using fixings for multiple use, it is assumed that if excessive slippage or failure of a fixing point occurs, that the load will be transferred to neighbouring fixing point. A fixing point can be defined as a single anchor or a group of anchors. This is known as a redundant system, where stability is not affected by an individual anchor failure. Existing assessment documents, such as ETAGs (European Technical Approval Guidelines) for metal and plastic fixings are still valid and transferred into EADs in accordance with the EU Construction Products Regulation (CRP). The ETAGs and the new EADs can be downloaded from the EOTA website: http://www.eota.eu The assessment document for mechanical fasteners (ETAG 001- 1, -2, -3, -4 or in the future, EAD 33-0232) and the assessment document for bonded anchors (ETAG 001-5 or in the future, EAD 33-0499) divides possible approvals of metal fixings into 12 options. Options 1-6 are for use in cracked and non-cracked concrete, options 7-12 are only for use in non-cracked concrete. Anchors of Option 1 offer the largest range of flexibility for assessment, since performance values for concrete of the strength classes C20/25 to C50/60, as well as the minimum spacing and edge distances are available (see table below). Possible assessment options according to EAD Options Cracked concrete Non-cracked concrete One value for all concrete strengths Different values for C20/25 to C50/60 One value for load direction 16 Separate values for tensile and shear capacity Ccr/Scr Cmin < Ccr/ Smin < Scr Design method as per EN 1992-4 1 ● – – ● – ● ● ● A 2 ● – ● – – ● ● ● A 3 ● – – ● ● – ● ● B 4 ● – ● – ● – ● ● B 5 ● – – ● ● – ● – C 6 ● – ● – ● – ● – C 7 – ● – ● – ● ● ● A 8 – ● ● – – ● ● ● A 9 – ● – ● ● – ● ● B 10 – ● ● – ● – ● ● B 11 – ● – ● ● – ● – C 12 – ● ● – ● – ● – C 662
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