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
Scope
The standard covers:Cast-in Fasteners
Anchor channels, headed studs, and other fasteners placed before concrete is poured. These are Clariti’s primary focus.
Post-installed Fasteners
Mechanical anchors, chemical anchors, and undercut anchors installed in hardened concrete.
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: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:Serviceability Limit State (SLS)
Verification of:- Displacement limits
- Crack width control
- Durability requirements
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
- Carbon steel or stainless steel
- Defined by characteristic yield and ultimate strength
- Ductility requirements for certain applications
- Where applicable, must meet specified strength requirements
Cracked vs. Uncracked Concrete
A critical design assumption:
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
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
National Annexes
EN 1992-4 allows national variation through National Annexes (NAs). Key nationally determined parameters include:- Partial safety factors (γM values)
- Design working life assumptions
- Seismic provisions
- Additional requirements for specific applications
Relationship to Other Standards
EN 1992-4 interfaces with:
Design loads (NEd, VEd) come from EN 1991 analysis. Clariti focuses on the resistance side per EN 1992-4.
Further Reading
- Safety Factors — Detailed partial factor information
- Design Methods — Verification approaches
- Load Combinations — How loads are combined
- Partial Factors — γ values for different modes