Expert's Guide to the World of Anchors

WEBINAR
EXPERTS GUIDE TO THE WORLD OF ANCHORS…

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Mr. Tinu Thomas
Technical Manager - UAE
Presenter
User ID – fischer MEA
WEBINAR EXPERTS GUIDE TO WORLD OF ANCHORS

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Time Split
Duration of the Webinar – 45 Minutes
Question & Answer – 10 Minutes
Poll & Feedback Session – 5 Minutes
11.00 AM Till 11.45AM
11.45 AM Till 11.55AM
11.55 AM Till 12.00PM

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For better experience
 USE ONLY GOOGLE CHROME OR FIREFOX
 DO NOT USE INTERNET EXPLORER
 PLS DO NOT DO PARALLEL DOWNLOADS
 QUESTIONS WILL BE ANSWERED AT THE END
 ALL ANSWERS WOULD BE MAILED

> WEBINAR EXPERTS GUIDE TO WORLD OF ANCHORS

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Founded in the Black Forest
Worldwide success – in 47 subsidiaries
Our locations
USA
Brazil
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Italy
Czech Republic
China
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>
also gives other companies
access to fischer’s
outstanding knowledge for
the improvement of internal
company processes and for
preventing waste.
is an intelligent
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children – and much more.
Even industrial machines
and plants can be
simulated into the smallest
detail.
Divisions
develops, manufactures and
distributes custom so-called
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and Multitouch systems. LNT
also develops and produces
for all of fischer’s divisions
offers a unique and
complete range of products
for the areas of plastic,
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as well as additional
ranges for experts and
DIYers.
creates comfort and
organization in cars – from
cupholders to complete
multifunctional consoles, for
both national and
international car
manufacturers.

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What is an Anchor??
A B
Anchor bolts are used to connect
structural and non-structural
elements to the concrete, masonry,
boards etc.

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TYPE OF ANCHORS

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 Resin Bonding Anchors  Undercut Anchors Expansion Anchors
Concrete

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Fun quiz!!!
Who founded the first Nylon Plug?
Prof. Arthur Fischer

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Main Factors Affecting the Anchor
Performance
Base Material Drill Method
Load Directions Load Type Anchor Layout

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Anchor selection depends on material
The following differentiation is
made:
Concrete
is a material containing cement
Masonry
is a composite material made from
stones and mortar
Board elements
are thin-walled materials
made from plasterboard, hard
fibres, plywood etc.
Material

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Concrete
Concrete comprises two sub-groups:
Normal
concrete
Lightweight
concrete
Material

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fails under low tensile loading (approx. 10% of
compressive strength).
Concrete
Cracks in concrete from
tensile loads.
Material

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 The load bearing capacity of anchors, designed for use in
cracked concrete, is reduced by approximately 30%
compared to non-cracked concrete
What is the influence of cracks on the performance of
anchors ?
Anchors suitable for cracked concrete:

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Masonry materials
Solid blocks with dense structure
Perforated materials with dense
structure
Solid blocks with porous structure
Perforated materials with porous
structure
Material

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Material: board elements
The third main group
consists of thin-walled
materials that are often
very low in strength.
Material

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Tip for board elements
Here, the anchors
selected should be those
that induce forces
through form-fit, e.g.
anchored directly on the
back of the board in the
cavity.
Suitable anchors for this
are normally called cavity
fixings.
Metal cavity fixing HM-S
Board fixing PD
Material

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Hammer drilling =
Turning motion
Small no. of impacts
High impact energy.
Impact drilling =
Turning motion
Large no. of impacts
Low impact energy.
Rotary drilling =
Only turning
Motion.
Drilling method

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Fun Fact!!!
Prof. Arthur Fischer had more patents than Edison.
1100 Patents!
Did you Know? He invented the modern flash light.

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Possible stress directions for an
anchor
Shear
force
Tension Oblique
tension
Bending + shear
force
N
V
N
V
V
R
Stress

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Stress type
Shock load
Dynamic load
Predominantly static load
Stress

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Member
Part of the structure to which the
fixture is attached.
The most important dimensions
are:
h
b
s
c1 c2
Member width b
Member thickness h
Spacing s
Edge distance c
Anchorage depth hef
hef
Action and resistance

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1. Required proofs for Tension:
 Steel  Pull-out Splitting Concrete cone

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s
a) Characteristic spacing
s  1.5 hef + 1.5 hef = 3 hef
c) Characteristic edge distance
c  1.5 hef
c
Effect of spacing and edge distance on :
cRkNneCapacityConcreteCo ,
b) For reduced spacing resistance
must be reduced accordingly
Smin

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Concrete Cone Capacity
c,RkN

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Lets Calculate.
What shall be the concrete capacity of a single M10 anchor??
Embedment depth – 100mm
Compressive strength Cube – 40 N/mm2 Cracked Concrete
Safety Factor – 1.5
30.4KN

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Anchor Pull out Capacity
p,RkN Obtained from ETA Assessment of the Product
Directly mentioned in ETA
document
Calculated from bond strength
mentioned in ETA

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Lets Calculate
Calculate pull out capacity of M10 threaded rod installed using Fischer
FIS EM Plus at an embedment depth of 100mm.
Concrete Grade – C20/25 Uncracked
Temperature range I

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2. Required proofs for Shear:
 Steel failure  Concrete pry-out
failure
 Concrete edge failure

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Steel failure
- shear load without lever arm
- shear load with lever arm
 Concrete pry-out failure
 Concrete edge failure
ukSs,Rk fA5.0V 
l
M
V
s,RkM
s,Rk


c,Rkcp,Rk NkV 
V,ucrV,ecV,V,hV,s0
V,c
V,c0
c,Rkc,Rk
A
A
VV  
Characteristic shear resistance VRk:

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if edge distance c1 = 100mm
Ao
c,V = 4.5 x c1
2 = 45000
Effect of spacing and edge on VRk,c:

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ETAG:
Taking loads (e.g. from unfavourable
anchors) is avoided through the
arrangement of slotted holes in
the load direction
Slotted holes in accordance
with DIN V ENV 1090-1:
Length l  2.5 . d1
with d1 ... bolt diameter
Characteristic resistance of concrete edge failure
c,RkV
Load transmission close to edges:

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a) Arranged parallel to an edge
Characteristic resistance of concrete edge failure
Load distribution close to an edge:
c,RkV
b) Arranged perpendicular to an edge
hole
clearance 

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Anchor design means that the following proofs are required:
TENSION SHEAR
0,1
N
N
,...Rd
Sd
N  0,1
V
V
,...Rd
Sd
V 
2,1VN 
or
0,15,1
V
5,1
N 
3. Required proofs for Combined load:
COMBINED

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Fischer Professional App
www.fischer.ae

> www.fischer.aeWEBINAR EXPERTS GUIDE TO WORLD OF ANCHORS

Expert's Guide to the World of Anchors

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