Chemical Anchor Technical Handbook

Theory Section
Differences Compared to the Design Method
According to ETAG Annex C
Chemical Anchoring
Contents Applications
Chemical Anchoring
Theory
Product Overview
Summary
Additional
Information
Product Details
In this handbook, various factors in ETAG Annex C have been combined
into a single factor and some of the factors have been left out in order to
make a simple manual calculation possible. Refer to the document “Metal
Anchors for Use in Concrete, Guideline for European Technical Approval
Annex C” for details regarding the statements below.
Resistance to tensile loads:
• Resistance to steel failure: no changes
• Resistance to pull-out failure: no changes
• Resistance to concrete cone failure: The general formula for concrete
cone resistance is:
N Rk,c = N 0 Rk,c · A c,N
· ψ s,N · ψ ec,N · ψ re,N · ψ ucr,N
A 0 c,N
Resistances to concrete cone failure are based on a standard concrete
quality of C20/25. The factor a B,N accounts for different concrete grades,
which are already reflected in:
A
NRk,c 0 c,N
· The factors a A,N and a A,R combine the factors · ψs,N ·
Ac,N
0
The simplified design method does not include the factor ψ ec,N , which
relates to the eccentricity of the acting load on the anchor plate. The
factor ψ re,N relates to a spalling of the concrete above the first layer of
reinforcing bars. This failure mode is not decisive for an embedment
depth greater than 100 mm or a reasonable layout of the reinforcing bars.
The factor ψ ucr,N accounts for the different resistances of cracked and
uncracked concrete. This manual gives these different values in separate
tables. For this reason, ψ ucr,N is unnecessary.
Resistance to splitting failure:
Splitting is not decisive if the minimum value for the thickness of the
concrete member is taken into account.
Additional
Information
Product Details
Product Overview
Chemical Anchoring
Theory
Contents Applications
1.8.4