Kindly elaborate on the different between ETAG and EC2-4 design. It will be good to come with examples.
Hi Jeremy, thanks for your query.
There are a few main differences between ETAG and EC2-4, in terms of documents and also designs.
ETAG 001 is a guideline and recommendation on how to design post-installed anchors and it has limited updates as well. This will create a limited level of awareness as a non-mandatory document while EC2-4 is a mandatory document when designing anchor channels, cast-in anchors and post-installed fastenings. EC2-4 will also be supported with national annexes published by local governmental entities (e.g. DSM/ JSM). This document also defines how to specify anchors and which steps to follow on the jobsite enabling proper anchor selection and installation.
Meanwhile, other changes in transitioning from ETAG 001 to Eurocode 2 Part 4 can be summarized as below:
Eurocode 2 Part 4 or EC2-4, was published to replace the ETAG anchor calculation methods (Annex C of the ETAG 001 guide for metallic anchors and EOTA TR029 technical report for chemical anchors). The changes below in the design standard will have significant impact on the calculation of:
-> Concrete strength classes
-> Anchor layout configurations
-> Anchor failure modes
-> Concrete strength class evaluation
-> Performance evaluation criteria for various failure modes
-> Tensile and shear combination evaluation
Let's take tensile and shear combination evaluation as example.
*ETAG 001 considers two different equations to check the tension and shear load combination depending on whether there was governing steel failure or not. (e.g. TR029 -> Refer 5.2.4)
*However, on top of ETAG 001's requirements, EC2-4 also takes into consideration the effects of supplementary reinforcement during combined tension and shear load check and evaluates steel and concrete governing failures separately. (e.g. EC2-4 -> Refer 7.2.3)
To understand further with regards to this, please feel free to drop an email to my.engineering@hilti.com or visit https://profisengineering.hilti.com/ to design with EN1992-4 now.
-MY Engineering Team