PETRA_PG-9-2010

PETRASupport for Hollow Core Slabs

for Floor Openings

Version: Peikko Group 9/2010Replaces version EN-3/2010

PETRA support for HC slabs

Peikko benefi ts

reliable: passed demanding test program

competitive price and delivery time

economical and easy to use in designing, manufacturing and installation of the elements

Benefi ts of Peikko PETRA

Easy to design:

Ready de ned geometry modi cations

Design diagrams

Easy to use:

Just put in place

No need for separate formwork

Fits well with various hollow-core slabs

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Peikko Group 9/2010CONTENTS

1. DESCRIPTION OF THE SYSTEM .......................4

2. DIMENSIONS AND MATERIALS ......................5

3. MANUFACTURING ..........................................63.1 Manufacturing method 6

3.2 Quality control 6

4. STRUCTURAL BEHAVIOR ................................64.1 Assembly time 6

4.2 Normal use 6

4.3 Fire situation 7

5. APPLICATION ..................................................75.1 Limitations for application 7

5.2 Design assumptions 85.2.1 Design values of actions 85.2.2 Global behaviour of the hollowcore fl oor 8

6. INSTALLATION ................................................9

7. ORDERING PETRA .........................................107.1 Examples of PETRA ordering codes 11

8. DESIGN DIAGRAMS ......................................12

4PETRA support for HC slabs

Figure 1. PETRA is supported by parallel hollowcore slabs

Figure 2. Hollowcore slab supported by PETRA

Figure 3. Typical layout of a hollowcore fl oor with PETRA (view from top)

supported slab

supporting slab 2

supporting slab 1

PETRA

opening in the oor

The resistance of the trimmer beam is provided by the bending strength of the front plate during normal use of the structure and by the composite action of the re rebar and concrete grouting at re situation.

1. DESCRIPTION OF THE SYSTEMPeikko PETRA is for supporting hollowcore slabs around oor openings. PETRA consists of an L-shaped front plate welded together with two side plates. The additional reinforcing bar provides resistance during re. PETRA is usually supported by two parallel slabs (Figure 1) and one or more slabs are supported by the front plate (Figure 2). The joints between the hollowcore slabs and PETRA have to be grouted before imposed loads are applied to the structure. The trimmer beam, consisting of PETRA and concrete grouting, transfers loads from the supported slab to parallel supporting slabs (Figure 3).

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Peikko Group 9/2010

Fire rebarSide plate 1

Side plate 2

Front plate

2. DIMENSIONS AND MATERIALSMaterials and standards:Plates S355MC EN 10149-2Rebars B500B EN 10080, SFS 1268 BSt500S DIN 488 A500HW EN 10080, SFS 1215

The shape and dimensions of PETRA depend on the layout of the hollowcore oor. The length of the front plate is determined by the width of the opening in the hollowcore oor. The depth of the front plate corresponds to the depth of the supported slab; the depth of side plates corresponds to the depth of the supporting slabs. In basic types of PETRA the depth of the supporting slabs is the same as the depth of the supported slab (Figure 4 a). In other cases, side plate variations have to be used (Figure 4 b). In spe-cial cases (for example when PETRA is supported by a wall), the side plate may be straight (Figure 4 c). The standard dimensions of structural parts of basic types of PETRA are indicated in Table 1.

Different types of PETRA are described in chapters 7 and 8.

Table 1. Dimensions of standard parts of basic types of PETRA (the depth of supported and supporting slabs are equal)

Depth of slabs [mm]

Front plate Side plate

Width b1 [mm]

Length L2 [mm]

Width b2 [mm]

150 140 150 100

175 140 150 100

200 140 150 100

220 160 170 100

265 160 170 100

300 160 170 100

320 160 170 100

350 160 170 100

370 160 170 100

400 160 170 100

450 160 170 100

500 160 170 100

Manufacturing tolerances 2 2 2

L2 = length of the side plate

b1 = width of the front plate

hf = depth of the supported slab

b2 = width of the side plate

hs = depth of the supporting slab

a) basic types of PETRA

b) side plate variation

c) side plate variation

Figure 4. Examples of PETRA slab hangers


3. MANUFACTURING3.1 Manufacturing method

Plates Flame or mechanical cutting and bendingRebars Mechanical cuttingWelding MAG by hand or with a robot

Welding class C (SFS-EN ISO 5817)

3.2 Quality control

Peikko Groups production units are externally controlled and periodically audited on the basis of production certi cations and product approvals by various organizations, including Inspecta Certi ca-tion, VTT Expert Services, Nordcert, SLV, TSUS and SPSC among others

4. STRUCTURAL BEHAVIORThe structural behavior and resistance of the trim-mer beam depends on the properties of PETRA as well as on the properties of the hollowcore slabs and the global behavior of the hollowcore oor. PETRA is designed to carry half of the self weight of the supported slab(s) and a part of imposed load from the composite oor in accordance with the following standards:

EN 1993-1-1: Design of steel structures: Gen- eral structural rules and rules for buildingsEN 1992-1-1: Design of concrete structures: General rules and rules for buildings

The following design situations are considered for PETRA: assembly time, normal use situation and re situation. The design at re situation is made with reference to EN 1992-1-2.

4.1 Assembly time

During assembly time, it is considered that PETRA is loaded only by the self weight of the supported slab. Since lateral joints between slabs are not grouted at this point, the supported slab is acting as a simply supported beam with PETRA as one of the supports. The load carried by PETRA is then determined according to Figure 5 as:

where gHC is the self weight of the supported slab [kN/m2].

Figure 5. Load distribution during assembly time

L0 = length of supported slab

gHC

L /20

L

The resultant of this load is situated outside of the shear centre of PETRA and causes torsion of the front plate (Figure 6). The maximum length of the supported slab is determined by PETRAs resistance to torsion during assembly time. Figure 6. Torsion of the front plate

gHC, R

eq

mt

4.2 Normal use

Before the structure is given into use, the lat-eral joints between the hollowcore slabs have to be grouted and hardened. Thereafter, it is possible to consider transverse distribution of loads between hollowcore slabs. This type of analysis is allowed by the Annex C of the European Standard for hollow-core slabs (EN 1168) under the condition that the horizontal displacements of the hollowcore oor are restricted by:

adjacent structural parts friction in supports friction in lateral joints ring reinforcement concrete topping with mesh reinforcement

If at least one of the above mentioned requirements is satis ed, it may be considered that PETRA will have to carry only imposed load situated within a triangular area shown on Figure 7.

2L.g

g 0RHC, HC=

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Figure 7. Load distribution during normal use situation

L0 = length of supported slab

q1L

60

The resistance values of standard PETRAs pre-sented as diagrams at the end of this document are calculated considering distribution of imposed load according to Figure 7. In cases where the above mentioned design model for imposed load may not be accepted, the load distribution from Figure 5 has to be used for imposed loads. In such case, Peikko technical support will design PETRA according to individual requirements (see the input data sheet at the end of this document).

4.3 Fire situation

During re situation, the front plate of PETRA is directly exposed to re without any additional re protection. For this reason, the resistance of the front plate is neglected in re design. The design of PETRA again depends on the structural model chosen for the hollowcore oor:

1) If it is considered that the hollowcore oor looses transverse stiffness when exposed to re, the structural action of the front plate is replaced by a reinforced concrete beam formed by coupling the additional re rebar with compressed concrete of the joint grouting (Figure 8). In this case, both permanent and imposed load carried by PETRA have to be determined according load distribution model from Figure 5. The load bearing behavior of the reinforced concrete end beam is guaranteed for structures with re resistance class R60. For struc-tures with higher re resistance classes, adequate re protection has to be provided to the surface of the front plate directly exposed to re. Figure 8. Reinforced concrete mechanism during fi re situation

tensioned re rebar

compressed concrete(grouting + part of HC slab)

2) If it is possible to consider that the hollow-core oor keeps its transverse stiffness under con-ditions mentioned in paragraph 4.2 also during re situation, the loads from the supported slab will be transferred to supporting slabs by lateral joints and no re reinforcement is needed. At the same time, it is always recommended to use re reinforcement in following cases:

PETRA carries direct linear or point load; PETRA is supporting two (2) or more hollowcore slabs.

5. APPLICATION5.1 Limitations for applicationThe standard PETRAs are designed to carry static loads. In the case of dynamic and fatigue loads, individual design has to be made.

PETRA is designed to be used in indoors and dry conditions. When using PETRA in other conditions, the surface treatment must be adequate accord-ing to environmental exposure class and intended operating life.

The shape of PETRA is optimized to be used with most of hollowcore slabs produced in European countries. The maximum bearing lengths provided by PETRA shown in Table 2 should satisfy require-ments for minimum bearing length speci ed in the type approval of the hollowcore slab.

Table 2. Maximum bearing lengths provided by PETRA [mm]

Depth of the supported slab [mm]

ot [mm]

othf

hf 200 80

hf > 200 100

The width of lateral joints between hollowcore slabs has to be within limits indicated in Table 3 to avoid cases illustrated on Figure 9.


Figure 9. Limits for widths of lateral joints

a) Joint is too narrow the side plate interferes with the upper edge of the supporting slab

b) Joint is too wide the bearing length of the side plate is not suffi cient

Table 3. Limits for widths of lateral joints

b

hs

Depth of the supporting slab [mm]

b [mm]

min max

hs 200 50 70

200 < hs 300 50 70

300 < hs 500 50 65

If the requirements concerning bearing length and width of joint of the hollowcore slab are different from those indicated in Table 2 and Table 3, Peikko technical support will design PETRA with special shape.

5.2 Design assumptions

5.2.1 Design values of actions

The design values of actions on PETRA are deter-mined according to EN 1990.

During assembly time, only actions resulting from the self weight of the hollowcore slab are consideredDuring normal use situation, both self weight and imposed loads are creating the sum of actions. During re situation, the load combination acting on PETRA consists of both self weight and imposed load.

5.2.2 Global behaviour of the hollowcore fl oor

The reactions from PETRA are transferred to sup-porting slabs over a relatively small area of the side plates. The resistance of the supported slab to withstand such point load should be checked by the designer of the hollowcore oor (especially with small hollowcore slabs or when there are openings in the supporting hollowcore slab).

The reaction transmitted by the side plates should be calculated using load distribution models presented in Chapter 4. If triangular distribution of imposed load according to Figure 7 may be considered, the design value of vertical reaction in the side plate of PETRA is:

( )12Q0HCGEd .q0,433.L.4.LL.g.V +=where q1 is the imposed load (kNm-2)gHC is the self weight of the supported slab (kNm-2)L is the length of the PETRA (mm)L0 is the length of the supported slab (mm)G,Q are partial safety factors for permanent and imposed load.

VEd

VEd

L

L0

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6. INSTALLATIONPETRA must be installed on an undamaged hol-lowcore slab to the location determined in the plan drawing. The slab has to be placed so that it is in contact with the re rebar or with the hori-zontal steel strip welded to the front plate of long PETRA hangers (Figure 10). When determining the position of PETRA and the length of the supported slab, please consider that the minimum distance between the edge of the opening in the oor and the supported slab is 51 mm for PETRA with depth of front plate hF 200 mm and 57 mm for other PETRAs (Figure 10). Figure 10. Position of supported slab (PETRA with fi re reinforcement)

L051-57 mm

edg

e o

f o

pen

ing

in

th

e

oo

r

If short PETRA (L < 1200 mm) is used without re rebar, the arrangement between the supported slab and the edge of the opening should be as shown on Figure 11. Figure 11. Position of supported slab (PETRA without fi re reinforcement)

L030 mm

edg

e o

f o

pen

ing

in

th

e

oo

r

The bottom edge of the supported slab should be removed according to Figure 12 so that the slab is bearing directly on the front plate.

Figure 12. Bottom edge of the supported slab should be removed so that the supported slab fi ts within the side plates. 12 mm hole for expander bolt at top of side plates.

removed bottom edge of hollowcore slab

12 mm hole for expander bolt

The gap between PETRA and the hollowcore slab should be fully cast when concreting the oor. The concrete should be hardened before applying loads to the oor.

On the top ange of side plates of PETRA are 12 mm holes for fastening PETRA to supporting hollow core slabs with expander bolts (Figure 12).

Figure 15. Two hollows must be connected, reinforced, casted and designed to support PETRA when there is a need to support PETRA on the area of hollows

Figure 14. It is not allowed to support PETRA on the area of empty non-reinforced hollow

Figure 13. PETRA must be installed on an undamaged edge of hollow core slab

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PETRA strong 200-1200 st320-200 without fire rebar

Heavy model (strong)

hf hs1 hs2L

Height of the supported slab hf and width of the opening L

In case of non-symmetric PETRA, the height of the supporting slabs 1 and 2 are indicated in this order. If straight side plate is required, it is indicated with code st followed with the side plates height.

If PETRA is ordered without re rebar, this is indicated at the end of the ordering code with the English words without re rebar

All dimensions in [mm]

7. ORDERING PETRAThe standard PETRAs may be ordered using codes given on the Figure 16.

If standard PETRA can not be used, or if standard design of PETRA is not possible (load cases or layout of the hollowcore oor not considered for standard PETRA, i.e. large openings in supported or supporting slabs), please ll the form at the end of this manual and contact Peikko technical support who will assist you in designing the PETRA special.

Figure 16. Forming PETRA product code

supporting slab 1

supporting slab 2

supported slab

wid

th o

f the

op

enin

g L

hs1

hs2

hf

Parts of product code marked with blue, purple and green are optional and independent from one another.

On the left:PETRA 200-1200 200-280

200

280

200

1200

Fire rebar

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Peikko Group 9/2010

7.1 Examples of PETRA ordering codes

1200

200

1800

200

1200

200

600

200

1400

200320

1200

200

320

1200

200

PETRA strong 200-1200 200-st200 without fi re rebar

PETRA 200-1200

PETRA 200-600 without fi re rebar

PETRA 200-1200 st320-200

PETRA strong 200-1800

PETRA strong 200-1400 320-200

PETRA strong 200-1200 without fi re rebar

Basic types of PETRA: Side plates are L-shaped and as high as front plate. There is no need to de ne side plates

Side plate variations: Both side plates have to be de ned

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8. DESIGN DIAGRAMSPETRAs are produced in three models:

PETRA model primarily used to support slabs with lengths of 4 6 m.PETRA strong model primarily used to support longer slabs or slabs subjected to high imposed loads.PETRA special model for special requirements

The colours of PETRA models:PETRA Light bluePETRA strong GreyPETRA special Green

The type of PETRA slab hanger should be selected using design diagrams on pages 14-25. The design diagrams of PETRA give the maximum value of imposed load as a function of the length and weight of the supported slab gHC. If other permanent loads g (concrete topping ) are acting on the hollowcore slab before the lateral joints between slabs are hardened, the total permanent load should be taken as gHC+g.

Loads in design diagrams are characteristic ones. Peikko has taken account partial safety factors when de n-ing curves.

If partial factors for loads are different than those indicated on the design diagrams, the maximum imposed load on PETRA is obtained as:

( )NA

Q

kNA

GNA HC

1,5.q1,35q += g

whereqk is the maximum value of imposed load obtained from load diagramsGNA; QNA are the partial factors determined according to National AnnexesIndividual design will be done by Peikko technical support for special cases:

load distribution models in the hollowcore oor are different than those assumed for standard PETRAs PETRA with high lengths (L > 2400 mm) PETRA carrying direct linear or point load

At the end of this document you will nd an input data sheet for the design of special PETRA.

The process of selection and design of PETRA is shown on the following gure:

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Peikko Group 9/2010

Standard design situationStandard design assumptions L 2400 mm only uniformly distributed load

Non-standard design situationDifferent to standard:

Load distributions Partial factors Self weight of slab

L > 2400 mm Point load or linear load on hanger

Properties of product:Load bearing resistance (pages 14-25) Geometry (Table 2 + Table 3)

Order PETRA: (Figure 16)Select model according to loads:

PETRA PETRA strong

Check the needed heights and shapes of side plates: Basic type of PETRA or side plate variationsSelect model according to global behaviour of hollow core oor (chapter 5.2.2): With or without re rebar

Contact Peikko technical support:Fill the ordering form at the end of this manual to order PETRA special and send it to Peikkos technical support

Peikko will:Design your PETRA special Give an unique name and ID-code to the productInstruct you to use this given name and ID-code in your design drawingsMake a shop drawing

Make an order to Peikko with the given name and ID-code

OK

NOTOK

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Span of the supported slab [m]


Imp

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Normal situation

Normal situation

Fire situation, class R60


PETRAPETRA strong

PETRAPETRA strong

PETRAPETRA strong

PETRAPETRA strong

Not valid for modelPETRA without fire rebar


G = 1,35Q = 1,50M0 = 1,0c = 1,4kN/m2kN/m2kN/m2

Self weight of the slab [kN/m2]Use characteristic values of both self weights and imposed loads when using these curves.

Add weight of the topping into self weight of slab if the topping will be casted before slab joints are hardened.

Valid for opening widths of 0 < L 1200 mm


PETRA 150-1200, PETRA strong 150-1200


PETRA 150, PETRA strong 150

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Normal situation

Normal situation



PETRAPETRA strong

PETRAPETRA strong

PETRAPETRA strong



PETRAPETRA strong

G = 1,35Q = 1,50M0 = 1,0c = 1,4kN/m2kN/m2kN/m2








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Normal situation

Normal situation



PETRAPETRA strong

PETRAPETRA strong

PETRAPETRA strong

PETRAPETRA strong



G = 1,35Q = 1,50M0 = 1,0c = 1,4kN/m2kN/m2kN/m2








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Imp

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Normal situation

Normal situation



PETRAPETRA strong

PETRAPETRA strong

PETRAPETRA strong



PETRAPETRA strong

G = 1,35Q = 1,50M0 = 1,0c = 1,4kN/m2kN/m2kN/m2








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Imp

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Normal situation

Normal situation



PETRAPETRA strong

PETRAPETRA strong

PETRAPETRA strong

PETRAPETRA strong



G = 1,35Q = 1,50M0 = 1,0c = 1,4kN/m2kN/m2kN/m2





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Imp

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-2]



Normal situation

Normal situation



PETRAPETRA strong

PETRAPETRA strong

PETRAPETRA strong



PETRAPETRA strong

G = 1,35Q = 1,50M0 = 1,0c = 1,4kN/m2kN/m2kN/m2





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ose

d lo

ad (

wit

ho

ut

self

wei

gh

t o

f th

e sl

ab)

[kN

m-2

]Im

po

sed

load

(w

ith

ou

t se

lf w

eig

ht

of

the

slab

) [k

Nm

-2]



Normal situation

Normal situation



PETRAPETRA strong

PETRAPETRA strong

PETRAPETRA strong

PETRAPETRA strong



G = 1,35Q = 1,50M0 = 1,0c = 1,4kN/m2kN/m2kN/m2





5,04,03,0




21www.peikko.com

0

2

4

6

8

10

12

14

16

2 3 4 5 6 7 8 9 10

0

2

4

6

8

10

12

14

16

2 3 4 5 6 7 8 9 100

2

4

6

8

10

12

14

16

2 3 4 5 6 7 8 9 10

0

2

4

6

8

10

12

14

16

2 3 4 5 6 7 8 9 10

Peikko Group 9/2010



Imp

ose

d lo

ad (

wit

ho

ut

self

wei

gh

t o

f th

e sl

ab)

[kN

m-2

]Im

po

sed

load

(w

ith

ou

t se

lf w

eig

ht

of

the

slab

) [k

Nm

-2]

Imp

ose

d lo

ad (

wit

ho

ut

self

wei

gh

t o

f th

e sl

ab)

[kN

m-2

]Im

po

sed

load

(w

ith

ou

t se

lf w

eig

ht

of

the

slab

) [k

Nm

-2]



Normal situation

Normal situation



PETRAPETRA strong

PETRAPETRA strong

PETRAPETRA strong



PETRAPETRA strong

G = 1,35Q = 1,50M0 = 1,0c = 1,4kN/m2kN/m2kN/m2





6,05,04,0




22

0

2

4

6

8

10

12

14

16

2 3 4 5 6 7 8 9 10

0

2

4

6

8

10

12

14

16

2 3 4 5 6 7 8 9 10

0

2

4

6

8

10

12

14

16

2 3 4 5 6 7 8 9 10

0

2

4

6

8

10

12

14

16

2 3 4 5 6 7 8 9 10




Imp

ose

d lo

ad (

wit

ho

ut

self

wei

gh

t o

f th

e sl

ab)

[kN

m-2

]Im

po

sed

load

(w

ith

ou

t se

lf w

eig

ht

of

the

slab

) [k

Nm

-2]

Imp

ose

d lo

ad (

wit

ho

ut

self

wei

gh

t o

f th

e sl

ab)

[kN

m-2

]Im

po

sed

load

(w

ith

ou

t se

lf w

eig

ht

of

the

slab

) [k

Nm

-2]



Normal situation

Normal situation



PETRAPETRA strong

PETRAPETRA strong

PETRAPETRA strong

PETRAPETRA strong



G = 1,35Q = 1,50M0 = 1,0c = 1,4kN/m2kN/m2kN/m2





6,05,04,0




23www.peikko.com

0

2

4

6

8

10

12

14

16

18

20

22

24

2 4 6 8 10 12 14

0

2

4

6

8

10

12

14

16

18

20

22

24

2 4 6 8 10 12 14

0

2

4

6

8

10

12

14

16

18

20

22

24

2 4 6 8 10 12 14

0

2

4

6

8

10

12

14

16

18

20

22

24

2 4 6 8 10 12 14

Peikko Group 9/2010



Imp

ose

d lo

ad (

wit

ho

ut

self

wei

gh

t o

f th

e sl

ab)

[kN

m-2

]Im

po

sed

load

(w

ith

ou

t se

lf w

eig

ht

of

the

slab

) [k

Nm

-2]

Imp

ose

d lo

ad (

wit

ho

ut

self

wei

gh

t o

f th

e sl

ab)

[kN

m-2

]Im

po

sed

load

(w

ith

ou

t se

lf w

eig

ht

of

the

slab

) [k

Nm

-2]



Normal situation

Normal situation



PETRAPETRA strong

PETRAPETRA strong

PETRAPETRA strong



PETRAPETRA strong

G = 1,35Q = 1,50M0 = 1,0c = 1,4kN/m2kN/m2kN/m2





6,05,04,0




24

0

2

4

6

8

10

12

14

16

18

20

22

24

2 4 6 8 10 12

0

2

4

6

8

10

12

14

16

18

20

22

24

2 4 6 8 10 12

0

2

4

6

8

10

12

14

16

18

20

22

24

2 4 6 8 10 12

0

2

4

6

8

10

12

14

16

18

20

22

24

2 4 6 8 10 12




Imp

ose

d lo

ad (

wit

ho

ut

self

wei

gh

t o

f th

e sl

ab)

[kN

m-2

]Im

po

sed

load

(w

ith

ou

t se

lf w

eig

ht

of

the

slab

) [k

Nm

-2]

Imp

ose

d lo

ad (

wit

ho

ut

self

wei

gh

t o

f th

e sl

ab)

[kN

m-2

]Im

po

sed

load

(w

ith

ou

t se

lf w

eig

ht

of

the

slab

) [k

Nm

-2]



Normal situation

Normal situation



PETRAPETRA strong

PETRAPETRA strong

PETRAPETRA strong

PETRAPETRA strong



G = 1,35Q = 1,50M0 = 1,0c = 1,4kN/m2kN/m2kN/m2





7,06,05,0




25www.peikko.com

0

2

4

6

8

10

12

14

16

18

20

22

24

2 4 6 8 10 12

0

2

4

6

8

10

12

14

16

18

20

22

24

2 4 6 8 10 12

0

2

4

6

8

10

12

14

16

18

20

22

24

2 4 6 8 10 12

0

2

4

6

8

10

12

14

16

18

20

22

24

2 4 6 8 10 12

Peikko Group 9/2010



Imp

ose

d lo

ad (

wit

ho

ut

self

wei

gh

t o

f th

e sl

ab)

[kN

m-2

]Im

po

sed

load

(w

ith

ou

t se

lf w

eig

ht

of

the

slab

) [k

Nm

-2]

Imp

ose

d lo

ad (

wit

ho

ut

self

wei

gh

t o

f th

e sl

ab)

[kN

m-2

]Im

po

sed

load

(w

ith

ou

t se

lf w

eig

ht

of

the

slab

) [k

Nm

-2]



Normal situation

Normal situation



PETRAPETRA strong

PETRAPETRA strong

PETRAPETRA strong



PETRAPETRA strong

G = 1,35Q = 1,50M0 = 1,0c = 1,4kN/m2kN/m2kN/m2





7,06,05,0




Permanent loads (characteristic value)

weight of hollowcore slab gHC = kN/m2

other permanent loads g = kN/m2 (on supported slab)

Imposed loads (characteristic value)

surface load q1 = kN/m2 (on supported slab)

linear load q2 = kN/m (on PETRA)

point load Q3 = kN (on PETRA)

Partial factors

concrete c = (recommended value = 1,5)steel M0 = (recommended value = 1,0)

reinforcement s = (recommended value = 1,15)permanent load G = (recommended value = 1,35)

imposed load Q = (recommended value = 1,5)welds M2 = (recommended value = 1,25)

reduction of imposed load during re 1,2 =(0 0,8 depending on the type of building)

Load distribution for imposed load

Basic dimensions

Fire reinforcement

Design model A

Yes (R60) No

Design model B

supporting slab hs2 = mmb = mm

supporting slab hs1 = mm

supported slab hf = mm

length of supported slab L0 = mm

width of opening L = mm

If a non standard PETRA is required, please ll a copy of this form and contact Peikko technical support

Ordering form for PETRA special

L

Peikko Group www.peikko.com

PETRA_PG-9-2010

Documents

dimensions of petra

petra support

ordering petra

petra view

systempeikko petra

hollowcore oor

plate figure

supported slab figure