> ## Documentation Index
> Fetch the complete documentation index at: https://docs.clariti.site/llms.txt
> Use this file to discover all available pages before exploring further.

# EN 1992-4 Overview

> Introduction to EN 1992-4 and its application in anchor channel design

EN 1992-4 is the European standard governing the design of fastenings for use in concrete. This page provides an overview of the standard and how Clariti implements it.

## What is EN 1992-4?

**EN 1992-4:2018** (*Design of fastenings for use in concrete*) is a harmonized European standard that defines:

* Design methods for concrete fasteners
* Verification procedures for all failure modes
* Partial safety factors and reliability requirements
* Product qualification criteria

It replaced the previous ETAG 001 guidelines and is part of the Eurocode system (specifically, part of EC2).

## Scope

The standard covers:

<CardGroup cols={2}>
  <Card title="Cast-in Fasteners" icon="star">
    Anchor channels, headed studs, and other fasteners placed before concrete is poured. These are Clariti's primary focus.
  </Card>

  <Card title="Post-installed Fasteners" icon="star">
    Mechanical anchors, chemical anchors, and undercut anchors installed in hardened concrete.
  </Card>
</CardGroup>

### What's Covered

* Fasteners under static, quasi-static, and fatigue loading
* Tension, shear, and combined loading
* Cracked and uncracked concrete
* Single fasteners and groups

### What's Not Covered

* Seismic design (see EN 1992-4 Annex C or national annexes)
* Fire design (see EN 1992-1-2)
* Fasteners in lightweight concrete (special provisions)
* Fibre reinforced concrete (requires additional guidance)

## Document Structure

EN 1992-4 is organized as follows:

| Section | Content                                          |
| ------- | ------------------------------------------------ |
| 1-3     | Scope, references, definitions                   |
| 4       | Basis of design                                  |
| 5       | Determination of action effects                  |
| 6       | Cast-in headed fasteners                         |
| **7**   | **Anchor channels** (primary Clariti reference)  |
| 8       | Post-installed mechanical fasteners              |
| 9       | Post-installed chemical fasteners                |
| Annexes | National parameters, seismic provisions, testing |

## Design Philosophy

EN 1992-4 follows limit state design principles consistent with other Eurocodes:

### Ultimate Limit State (ULS)

Verification that the design resistance exceeds the design action:

```
Ed ≤ Rd

Where:
  Ed = design value of action (factored load)
  Rd = design value of resistance (factored capacity)
```

All failure modes must satisfy this inequality.

### Serviceability Limit State (SLS)

Verification of:

* Displacement limits
* Crack width control
* Durability requirements

<Tip>
  Clariti primarily addresses ULS verification. SLS checks (deflection, fatigue) may require additional analysis outside the tool.
</Tip>

## Material Assumptions

The standard assumes:

**Concrete:**

* Normal weight concrete (density 2000-2600 kg/m³)
* Strength classes C12/15 to C90/105
* Cracked or uncracked state

**Steel:**

* Carbon steel or stainless steel
* Defined by characteristic yield and ultimate strength
* Ductility requirements for certain applications

**Grout/Mortar:**

* Where applicable, must meet specified strength requirements

## Cracked vs. Uncracked Concrete

A critical design assumption:

| Condition | Assumption | When to Use                                 |
| --------- | ---------- | ------------------------------------------- |
| Cracked   | k₁ = 8.9   | Default — assume cracking occurs            |
| Uncracked | k₁ = 12.7  | Only when cracking can be reliably excluded |

**Uncracked concrete** may be assumed only when:

* Tension zone is always in compression (prestressed elements)
* Detailed analysis proves no cracking occurs under SLS loads
* Member is designed to remain uncracked throughout its life

<Warning>
  Most structural applications should assume cracked concrete. Using uncracked values without justification is unconservative and may not be accepted by checking engineers.
</Warning>

## Product Qualification

Anchor channels must have:

* **ETA (European Technical Assessment)** — Product-specific approval
* **CE marking** — Conformity to European standards
* **Declaration of Performance** — Manufacturer's declared properties

Clariti only includes products with valid ETAs, ensuring all resistance values are certified and traceable.

## National Annexes

EN 1992-4 allows national variation through National Annexes (NAs). Key nationally determined parameters include:

* Partial safety factors (γ<sub>M</sub> values)
* Design working life assumptions
* Seismic provisions
* Additional requirements for specific applications

Clariti uses the recommended values from the base standard. Check your jurisdiction's National Annex for any modifications.

## Relationship to Other Standards

EN 1992-4 interfaces with:

| Standard    | Interface                                     |
| ----------- | --------------------------------------------- |
| EN 1990     | Basis of structural design, load combinations |
| EN 1991     | Actions on structures (load values)           |
| EN 1992-1-1 | Concrete design (material properties)         |
| EN 1993-1-1 | Steel design (for steel elements)             |
| EN 1998-1   | Seismic design                                |

Design loads (N<sub>Ed</sub>, V<sub>Ed</sub>) come from EN 1991 analysis. Clariti focuses on the resistance side per EN 1992-4.

## Further Reading

* [Safety Factors](/en-1992-4/safety-factors) — Detailed partial factor information
* [Design Methods](/en-1992-4/design-methods) — Verification approaches
* [Load Combinations](/en-1992-4/load-combinations) — How loads are combined
* [Partial Factors](/en-1992-4/partial-factors) — γ values for different modes