Post on 08-May-2023
The Formwork Experts
Regulations, standardsand tables
Design loadings
Design values for Dokasystem parts
Calculation informationWall formwork
Calculation informationFloor formwork
Tables
DokaCalculation Guide
Auszugslänge zul. axiale Last a. Druck [kN]
L [m] min. L halb. L max. L Zug
6,0 - 7,440,0
40,027,8
7,1 - 8,540,0
38,224,3
8,4 - 9,840,0
35,621,7
9,7 - 11,140,0
31,719,0
40
10,8 - 12,240,0
27,816,1
11,9 - 13,334,2
24,113,4
13,2 - 14,627,1
21,512,2
14,5 - 15,920,8
17,59,5
12/2002 NK
The Formwork Experts2
© by Doka Industrie GmbH
A-3300 Amstetten
Reprinting and reproduction of this Calculation Aids documentation - even in part - is not
permissible without the express permission of Messrs. Doka Industrie GmbH.
DIN Standards are reproduced with the permission of DIN Deutsches Institut für Normung
e.V. Where reference is made to a DIN Standard, the most recently issued edition of the
respective Standard, as available from Beuth Verlag GmbH, Burggrafenstrasse 6, D-10787
Berlin 30, shall be applicable.
We reserve the right to effect modifications in the interests of technical progress.
The Formwork Experts 3
TablesProfile tables Page 49Characteristic material values Page 62Frequently used formulae Page 66
Calculation information: Floor formworkBeam-forming supports Page 39Dokaflex 20 Page 41Tableforms d2 Page 42Tower frames d2 Page 43Supporting scaffold Aluxo Page 44Supporting scaffold Staxo Page 46
Calculation information: Wall formworkLarge-area formwork: Timber formwork beam Doka H 20 Page 22Steel walings Page 24Column formwork Page 26Supporting construction frames Page 28Struts Page 30Panel stabilisers Page 32Form ties Page 33Climbing formwork Page 34Folding platforms Page 36Shaft platforms Page 38
Design values for Doka system partsFormwork sheathing Page 11Timber beams Page 15Steel components Page 19
Design LoadingsVertical and horizontal loads Page 7Pressure of fresh concrete on vertical formwork Page 9
Regulations, Standards and TablesGeneral remarks Page 5
The Formwork Experts 5
General remarksRegulations and Standards
DIN 1052 - Structural use of timber / Ouvrages en bois
DIN 1055 - Design loads for buildings / Charges théoriques pour bâtiments
DIN 4420 - Service and working scaffolds / Echafaudages de service
DIN 4421 - Falsework / Echafaudages d'étaiment
DIN 4424 - Telescopic steel props / Montants télescopiques en acier avec un dispositifd'extension
DIN 18.202 - Tolerances in building / Tolerances dimensionelles dans la constructionimmobilière
DIN 18.215 - Timber form boards for concrete and reinforced concrete structures, standarddimension 0.50 m <x> 1.50 m, thickness = 21 mm / Panneaux de coffrage en bois,pour ouvrage en béton et en béton armé, dimensions standard: 0,50 m <x> 1,50m, epaisseur 21 mm
DIN 18.216 - Formwork ties / Tirants de coffrage
DIN 18.217 - Concrete surfaces and formwork surface / Surface de béton et film de coffrage
DIN 18.218 - Pressure of fresh concrete on vertical formwork / Pression de béton fraichementmalaxé sur des coffrages verticaux
DIN 18.800 - Structural steelwork / Construction métalliques
DIN 68791 - Large area shuttering panels of core plywood for concrete and reinforcedconcrete / Panneaux de coffrage à grande surface en contreplaqué latté oulamellé pour béton et béton armé
Accident prevention regulations of "Bauberufsgenossenschaft" employee safety organisation.
Tables
The Doka Calculation Aids contain the principal data needed for using Doka formwork systems.
Please see our brochures for detailed information and "how-to-use" instructions.
For help with special applicational problems, please see the following reference works:
Bautabellen (Construction Tables), Sträußler/KrapfenbauerPublishers: Verlag Jugend und Volk
Stahl im Hochbau (Steel in building construction),Verein Deutscher EisenhüttenleutePublishers: Verlag Stahleisen, Düsseldorf
Stahlbauprofile (Structural steel sections)Verein Deutscher EisenhüttenleutePublishers: Verlag Stahleisen, Düsseldorf
Bautechnische Zahlentafeln (Numerical tables for construction engineering), Wendehorst/MuthPublishers: B.G. Teubner, Stuttgart
Holzbau Taschenbuch (Timber construction pocket book), Halász/ScheerPublishers: Verlag Wilhelm Ernst & Sohn, Berlin
The Formwork Experts 7
Vertical and horizontal loadsVertical loads
Constant loads
Self-weight of formwork according to DIN 1055 Part 1 - Design loadings for buildings.For weights of individual parts of the DOKA system, see DOKA brochures.
Effective loads (payloads)
a) For supporting scaffolds:DIN 4421 postulates a payload of 20 % of the self-weight of the fresh concrete on an area of 3.0 x 3.0 m(although not less than 1.5 kN/m² and not more than 5 kN/m²), and of 0.75 kN/m² for remaining areas.
b) For work and safety scaffoldings:As per DIN 4420 Part 1
Concrete loads
(As per DIN 1055 Page 1- Design loadings for buildings)
Reinforced concrete 25 kN/m³Addition for fresh concrete 1 kN/m³
26 kN/m³
Horizontal loads
Pressure of fresh concrete
Pressure of fresh concrete on vertical formwork - DIN 18.218
V100
For supporting scaffolds, 1/100 of the vertical loads should be assumed for the base of the formwork.
Wind loads
Wind loads as per DIN 1055, Part 4
Wind speed Dynamic Wind pressure w for wall pressure q formwork (C
f = 1.3)
0 to 8 m above ground 28.3 m/s 102 km/h 0.5 kN/m² 0.65 kN/m²8 to 20 m above ground 35.8 m/s 129 km/h 0.8 kN/m² 1.04 kN/m²
20 to 100 m above ground 42.0 m/s 151 km/h 1.1 kN/m² 1.43 kN/m²over 100 m above ground 45.6 m/s 164 km/h 1.3 kN/m² 1.69 kN/m²
To obtain the wind pressure w, multiply the dynamic pressure q by the force coefficient cf (as a rule, this
will be cf = 1.3 for wall formwork).
Horizontal loads
such as tension loads from cables, thrust loads etc.
Lateral forces on balustrades
Horizontal single load P = 0.3 kNin the most unfavourable position as defined by DIN 4420, Part 1
The Formwork Experts8
Pressure of fresh concrete onvertical formwork DIN 18 218
Consistency ranges Slump a Compaction v
Meaning Symbol [cm]
stiff K1 - 1.45 to 1.26
plastic K2 ≤40 1.25 to 1.11
soft K3 41 to 50 1.10 to 1.04
Consistency ranges Slump a Compaction v
Meaning Symbol [cm]
stiff KS - ≥1.20
plastic KP 35 to 41 1.19 to 1.08
soft KR 42 to 48 1.07 to 1.02
flowing KF 49 to 60 -
to DIN 1045, Edition1980to DIN 1045, Edition 1972and DIN 18218
Consistency ranges of fresh concrete
September 1980
Prerequisites:
Weight of fresh concrete 25 kN/m³
Setting of concrete 5 h
Tight formwork
Compaction with internal vibrator
Fresh concrete temperature +15°C
Columns
Walls
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0
0
10
20
30
40
50
60
70
80
90
100
110
120
130
140
0
1
2
3
4
5
Speed of placing vb [m/h]
Fre
sh
co
ncre
te p
ressu
re p
[k
N/m
²]
Hy
dro
sta
tic p
ressu
re h
eig
ht
h [
m]
1.0
1.1
1.2
1.3
1.4
Co
mp
acti
on
acco
rdin
g t
o w
alz
Flow
concr
ete
K3
K1 5 · v b + 21
K210 · v b
+ 19
17 · v b
+ 1
7
14 · v b
+ 1
8
The Formwork Experts 9
Pressure of fresh concrete onvertical formwork DIN 18 218
All other prerequisites as per DIN 18218:
Weight of fresh concrete 25 kN/m³Tight formworkCompaction with internal vibrator
Fresh concrete temperature 15 °C
with setting retarded by 5 h
140
130
120
110
100
90
80
70
60
50
40
30
20
10
00 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 6.5 7
Walls
Columns
Flow
concr
ete
K2
K1
K3
Speed of placing vb [m/h]
Fre
sh
co
ncre
te p
ressu
re p
[kN
/m²]
140
130
120
110
100
90
80
70
60
50
40
30
20
10
00 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 6.5 7
Walls
Columns
Flow
concr
ete
K3
K2
K1
Speed of placing vb [m/h]
Fre
sh
co
ncre
te p
ressu
re p
[kN
/m²]
140
130
120
110
100
90
80
70
60
50
40
30
20
10
00 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 6.5 7
Walls
Columns
Flow
concr
ete
K1
K2
K3
Fresh concrete temperature 15 °Cwithout retarding admix
Speed of placing vb [m/h]
Fre
sh
co
ncre
te p
ressu
re p
[kN
/m²]
140
130
120
110
100
90
80
70
60
50
40
30
20
10
00 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 6.5 7
K2
K1
K3
Walls
Columns
Speed of placing vb [m/h]
Fre
sh
co
ncre
te p
ressu
re p
[kN
/m²]
Fresh concrete temperature 5 °Cwithout retarding admix
September 1980
Fresh concrete temperature 5 °Cwith setting retarded by 5 h
Flow
concr
ete