Original Operating Instructions
Platform SCP
Introduction
9
999805802 - 03/2016
Eurocodes at Doka
In Europe, a uniform series of Standards known as
Eurocodes
(EC) was developed for the construction
field by the end of 2007. These are intended to provide
a uniform basis, valid throughout Europe, for product
specifications, tenders and mathematical verification.
The EC are the world's most highly developed Stand-
ards in the construction field.
In the Doka Group, the EC are to be used as standard
from the end of 2008. They will thus supersede the DIN
norms as the "Doka standard" for product design.
The widely used "Permissible stress design" (compar-
ing the actual stresses with the permissible stresses)
has been superseded by a new safety concept in the
EC.
The EC contrast the actions (loads) with the resistance
(capacity). The previous safety factor in the permissible
stresses is now divided into several partial factors. The
safety level remains the same!
Comparison of the safety concepts (example)
E
d
Design value of effect of actions
(E ... effect; d ... design)
Internal forces from action F
d
(V
Ed
, N
Ed
, M
Ed
)
R
d
Design value of the resistance
(R ... resistance; d ... design)
Design capacity of cross-section
(V
Rd
, N
Rd
, M
Rd
)
F
d
Design value of an action
Steel:
R
d
=
R
k
Timber: R
d
= k
mod
·
R
k
F
d
=
F
· F
k
M
M
(F ... force)
F
k
Characteristic value of an action
"actual load", service load
(k ... characteristic)
e.g. dead weight, live load, concrete pressure,
wind
R
k
Characteristic value of the resistance
e.g. moment resistance to yield stress
F
Partial factor for actions
(in terms of load; F ... force)
e.g. for dead weight, live load, concrete pres-
sure, wind
Values from EN
12812
M
Partial factor for a material property
(in terms of material; M...material)
e.g. for steel or timber
Values from EN
12812
k
mod
Modification factor
(only for timber – to take
account of the moisture and the duration of load
action)
e.g. for Doka beam H20
Values as given in EN 1995-1-1 and EN
13377
E
d
R
d
Permissible stress design
EC
/
DIN concept
F
actual
F
permissible
E
d
R
d
A
Utilisation factor
60 [kN]
60<70 [kN]
115.5 [kN]
n
~ 1.65
F
yield
F
permissible
F
actual
98013-100
A
90 [kN]
115.5 [kN]
90<105 [kN]
R
k
R
d
E
d
g
M
= 1.1
g
F
= 1.5
98013-102
A
The "permissible values" communicated in
Doka documents (e.g.: Q
permissible
= 70
kN)
do not correspond to the design values
(e.g.: V
Rd
= 105
kN)!
➤
Avoid any confusion between the two!
➤
Our documents will continue to state the per-
missible values.
Allowance has been made for the following par-
tial factors:
F
= 1.5
M, timber
= 1.3
M, steel
= 1.1
k
mod
= 0.9
In this way, all the design values needed in an
EC design calculation can be ascertained from
the permissible values.
Summary of Contents for Platform SCP
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Page 31: ...Original Operating Instructions Platform SCP Anchoring on the structure 31 999805802 03 2016 ...
Page 61: ...Original Operating Instructions Platform SCP Start up phases 61 999805802 03 2016 ...
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