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 Experts4

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 Experts6

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

The Formwork Experts10