Page 9 - ASF Katalog 2018 en

2 ANCHORAGES

The verification format for the ultimate limit The design resistances are calculated using
state to DIN EN 1993-5 is: the following equations from EAU 2004, R 20,
for the shaft and core cross-sections:

F = Design tensile resistance of anchor thread Design resistance, thread: F = min (F ; F )
tt,Rd t,Rd tt,Rd yt,Rd
F = Design tensile resistance of anchor shaft Failure in thread: F = k*F *A /γ
tg,Rd tt,Rd t ua s M2
= Design resistance at yield stress / Yield stress, thread: F = F *A /γ
F yt,Rd y s M0
yt,Rd 0.2% proof stress of anchor thread
= Design resistance at yield stress / Design resistance, shaft: F = min (F ; F )
F g,Rd tg,Rd yg,Rd
yg,Rd 0.2% proof stress of anchor shaft Failure in shaft: F = A *F /γ
K = Notch factor tg,Rd g ua M2
t Yield stress, shaft: F yg,Rd = F *A /γ M0
g
y
F = Tensile strength of anchor
ua
F = Yield stress of anchor
y Design resistance, anchor: F = min (F ; F )
A = Stressed cross-sectional area, thread u,Rd t,Rd g,Rd
s
A = Gross cross-sectional area, shaft
g
γ = Partial safety factor for anchor shaft stressed up to failure
M2
γ = Partial safety factor for anchor shaft
M0
Corrosion protection
The simplest and least expensive way of achieving effective corrosion However, should you require coated anchor materials, then any form
protection is to increase the diameter of the bar and the associated of coating is possible. All customary coating systems involving the
thread. The table below will help you decide whether increasing the application of paint on surfaces prepared by abrasive blasting can be
size of the steel is worthwhile for your structure or whether a coating applied.
system would be more appropriate.
Besides coating, the methods most frequently used are wrapping
Please note that every coating increases the price per kilogram, with Densoplast tape or hot-dip galvanising to EN ISO 1461 (except
prolongs the fabrication time for the anchor, is almost always damaged ASF600).
during transport and installation and from the environmental viewpoint
is in some cases at least questionable. Corrosion chart for steel anchors
EN 1993-5, Table 4-1 – Recommended values for loss of thickness
[mm] due to corrosion in soils, with or without groundwater

Required design working life

5 Years 25 Years 50 Years 75 Years 100 Years
Non-compacted and non-aggressive fills (clay, slate, sand, silt) 0.18 0.7 1.2 1.7 2.2
Freshwater (river, canal, ...) in the region of the waterline 0.18 0.55 0.9 1.15 1.4
Severely polluted freshwater (wastewater, industrial wastewater)
in the region of the waterline 0.3 1.3 2.3 3.3 4.3
Seawater in a temperate climate in the region of the waterline 0.55 1.9 3.75 5.6 7.5
(low water and splash water zones)
Seawater in a temperate climate in the underwater or tidal zones 0.25 0.9 1.75 2.6 3.5

Note: For compacted fills, EN 1993-5 permits the corrosion rates to be halved.
EN 1993-5, Table 4-2 – Recommended values for loss of thickness [mm]
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