International Catalogue

Failure modes
Steel failure tension
Extraction
Concrete edge
breaking
▸ Expert tip
Steel failure shearing
Cracked concrete
Concrete column
breaking
With excess stress, incorrect installation or a substrate with inadequate load bearing
capacity, the following failure modes can occur:
Fracture of the anchor base due to
▪ Tensile load “N” or shear load “V” too high
▪ Inadequate strength of anchor base
▪ Setting depth too low
Component splits due to
▪ Component dimensions too small
▪ Deviation from the specified edge and axial spacings
▪ Expansion pressure too high
Fixing pulls out due to
▪ Failure of the frictional and bonded connection due to high load or
incorrect installation
Steel fracture due to
▪ Fixing and/or steel strength too low for the applied load
▪ In most of the anchor approvals, the anchoring of the mainly static loads is regulated.
However, even officially approved systems are available for anchoring of nonstatic
loads (dynamic, e.g. FHB dyn) as well as for unusual effects in the nuclear power plant
construction (FZA-K).
▪ There are no anchor approvals in Europe for the shock or earthquake type of loads.
The anchoring of such loads is however also possible due to existing guidelines or
with the help of test reports. At the moment, earthquakes loads are regulated in the
American documents. Anchors like FAZ II, FH II and the injection system FIS EM can
be assessed on this basis even for earthquake loads.
▪ Main failure causes for anchors are overload, faulty installation or an
insufficient load-bearing base.
Basic Knowledge of Fastening Technology
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