Design of connections for use in concrete

The design of the attachments used to transmit the actions to the concrete is regulated by part 4 of Eurocode 2 (EN 1992-4) .

By the spring of 2019 , EN 1992-4 will have to be adopted by member states . From that date, the design of the attacks for use in concrete will be regulated, for the first time, by a standard, and not by technical specifications as occurred in the past . This is an important step for the sector.

Finally, a single document for the design of attacks for various actions
The new standard summarizes in a single document the design of various connection systems for different actions. This represents a novelty for the sector, since in the past the design of the attacks was described in various documents (see Figure 1).

EN 1992-4 contains both the rules for the design of pre-installed systems (channel profiles, nail pins), and those for post-installed systems (screws, expansion plugs, …). The document contains the design rules for a wide range of actions: static, almost static, seismic and fatigue . There are also some clauses regarding fire design.

Development of the various guidelines for the design of the connections for use in concrete

Figure 1: Time development of the different guidelines for the design of the connections for use in concrete

EN 1992-4 represents the state of the art for the design of attachments that transmit loads to concrete. The inclusion in the Eurocodes program aligns the level of security of the attacks with the more general level of the structures, with particular reference to concrete structures. Furthermore, it guarantees a uniform design procedure throughout Europe.

From the DAfStb a commentary explaining the EN 1992-4 standard
Following the drafting of a specific part of Eurocode 2, and the consequent attention paid to the design of the attacks to be used in concrete, the German Structural Concrete Committee (DAfStb) decided to draw up a commentary to EN 1992-4. The DAfStb 615 document was prepared with the intention of facilitating the understanding and use of the European standard. In order to spread the use of the commentary, even outside of Germany, the commentary was also written in English.

The first part of the commentary contains the explanation of the text of the standard , notes on the derivation of some rules, as well as additional provisions.

The second part illustrates the technical reports mentioned in the standard . Both parties were drafted by the Technical Sub-committee “Fastening Technology” of the DAfStb applying an approval procedure similar to those used in the standardization committees, or the consensus between all the groups involved.

The third part of the commentary contains the articles written by the members of the “Fastening Technology” Technical Sub-Committee of the DAfStb, and contain further explanations of some specific topics . The contributions derive essentially from the involvement of the authors in the work groups that led to the drafting of EN 1992-4, and concern, in particular, some applications not covered by the standard for which some engineering solutions are also proposed.

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