Elastomeric bearings

D e s i g n , B u i l d , M a i n t a i n

C VI 3

A laminated elastomeric bearing is an elastomeric rubber

block reinforced with steel plates vulcanised when built.

This bearing is the connection between a structure and its

support, and should make the following possible through

elastic deformation:

• transmission of normal forces;

• horizontal movements;

• rotation of the structure in any direction;

• transmission of horizontal forces, within defined limits.

It may also be provided with a sliding plane for withstanding

large movements of the structure and also having a one or

two horizontal movement locking systems.

All Freyssinet bearings are CE certified.

Elastomeric Bearing

Contents

Applications

Dimensions

Elastomeric bearing types

Production and quality

p 3

p 4

p 6

p 7

3

Applications

Cruas Nuclear Power Plant - France.

compression rotation horizontal deformation

Omnisports Palace at Paris-Bercy - France.

Behaviour

Each elemental layer, subject to stresses and movements, deflects as shown in

the three diagrams below:

Shears that occur in the elastomeric layers depend on their dimensions, stresses

and also the characteristics of the elastomer used.

Sizing of bearings is based on restricting these shears in accordance with current

national or international regulations.

Use

Banded elastomeric bearings are mainly used in the structures field for which

this product has many advantages: long service life, reliability, maintenance free,

lightness, small overall dimensions and easy to install.

These qualities are also sought in the building field where laminated elastomeric

bearings may be used for filtering vibrations (reduction of noise annoyance for

example) or even earthquake proof insulators (acceleration reduction).

Installation

Installation quality is a vital condition for efficient operation and long lasting quality.

Arrangements should be made at the design stage for providing sufficient clea-

rance around the bearings so they can be monitored and possibly replaced.

4

Dimensions The figures provided in this table relate to Type B and Type C bearings in accordance

with EN 1337-3. The different values shown below may be changed as a function

of the actual stresses on the bearing involved.

AllowablerotationAllowable

displacement

Totalthickness of

bearing

Totalelastomerthickness

Thicknessof thicker

steel plates

Allowabledisplacement

Totalthicknessof bearing

Totalelastomerthickness

Reinforcingplates

thickness

Numberof reinforcing

plates(TYPE B)

Numberof

layers

Layerthickness

Compressionload

under zerodisplacement

Plandimensions

ofbearings

100x150100x200

150x200150x250150x300

200x250200x300200x350200x400

Ø200

Ø250

250X300250X400

Ø300

Ø350

300X400300X500300X600

350X450

Ø400

400X500

400X600

Ø450

450X600

TYPE B TYPE C

axb, D F t n ns ts te T w Ts Te T w

mm kN mm mm mm mm mm mm mm mm mm m rad

23

234

3456

234

234

34567

456

34567

3456

34567

3456

45678

45678

3456

456789

120179

408558715

803104312911547

625

1578

16082425

2230

3598

203627873569

3091

3220

4454

5778

5204

6991

8

8

8

8

8

8

8

8

12

12

12

12

12

12

12

34

345

4567

345

345

45678

567

45678

4567

45678

4567

56789

56789

4567

56789

10

3

3

3

3

3

3

3

3

4

4

4

4

4

4

4

2129

212937

29374553

212937

212937

2937455361

374553

2937455361

41536577

4153657789

41536577

53657789

101

53657789

101

41536577

53657789

101113

3041

304152

41526374

304152

304152

4152637485

526374

4152637485

577389

105

577389

105121

577389

105

7389

105121137

7389

105121137

577389

105

7389

105121137153

2129

212937

29374553

212937

212937

2937455361

374553

2937455361

41536577

4153657789

41536577

53657789

101

53657789

101

41536577

53657789

101113

15

15

15

15

15

15

15

15

20

20

20

20

20

20

20

1624

162432

24324048

162432

162432

2432404856

324048

2432404856

36486072

3648607284

36486072

4860728496

4860728496

36486072

4860728496

108

4960

496071

60718293

496071

496071

60718293

104

718293

60718293

104

84100116132

84100116132148

84100116132

100116132148164

100116132148164

84100116132

100116132148164180

1624

162432

24324048

162432

162432

2432404856

324048

2432404856

36486072

3648607284

36486072

4860728496

4860728496

36486072

4860728496

108

2131

101520

8101316

91419

81216

68

101214

91114

579

1012

8101315

79

111315

7101215

79

111214

78

101213

79

1113

678

101113

5

Figures provided as examples. Other sizes are available as a function of the requirements linked to a given application. Contact Freyssinet.

The loading limits given in this table correspond to the loading of a bearing device to the ULS, in accordance with the verification

requirements of standard EN 1337-3-2005.

AllowablerotationAllowable

displacement

Totalthickness of

bearing

Totalelastomerthickness

Thicknessof thicker

steel plates

Allowabledisplacement

Totalthicknessof bearing

Totalelastomerthickness

Reinforcingplates

thickness

Numberof reinforcing

plates(TYPE B)

Numberof

layers

Layerthickness

Compressionload

under zerodisplacement

Plandimensions

ofbearings

Ø500

500x600

Ø550Ø600

600x600

600x700

700x700Ø700Ø750

700x800

800x800Ø800Ø850

900x900Ø900

TYPE B TYPE C

axb, D F t n ns ts te T w Ts Te T w

mm kN mm mm mm mm mm mm mm mm mm m rad

34567

456789

10

45678

456789

456789

456789

10

456789

10

456789

10

456789

1011

6848

8262

882512561

8214

10329

137491055313949

16772

150541158814804

2197116951

12

12

12

16

16

16

16

20

20

45678

56789

1011

56789

56789

10

56789

10

56789

1011

56789

1011

56789

1011

56789

101112

4

4

4

5

5

5

5

5

5

4153657789

53657789

101113125

53657789

101

6985

101117133149

6985

101117133149

6985

101117133149165

6985

101117133149165

85105125145165185205

85105125145165185205225

577389

105121

7389

105121137153169

7389

105121137

94115136157178199

94115136157178199

94115136157178199220

94115136157178199220

110135160185210235260

110135160185210235260285

4153657789

53657789

101113125

53657789

101

6985

101117133149

6985

101117133149

6985

101117133149165

6985

101117133149165

85105125145165185205

85105125145165185205225

20

20

20

20

20

20

20

20

20

3648607284

4860728496

108120

4860728496

648096

112128144

648096

112128144

648096

112128144160

648096

112128144160

80100120140160180200

80100120140160180200220

84100116132148

100116132148164180196

100116132148164

109130151172193214

109130151172193214

109130151172193214235

109130151172193214235

125150175200225250275

125150175200225250275300

3648607284

4860728496

108120

4860728496

648096

112128144

648096

112128144

648096

112128144160

648096

112128144160

80100120140160180200

80100120140160180200220

579

1113

5679

101112

678

1011

689

111214

679

101213

5679

101112

5678

101112

5679

101112

46789

101112

6

Standard bearings

Bearings are individually moulded and the reinforcing plates are completely buried

in the elastomer with at least 4mm lateral cover and generally 2.5mm thick (type

B) outside layers with the exception of bearings provided with thick external bands

(type C).

These bearings may have a rectangular, square or circular section. They may also

have holes for running specific materials through (cross bar anchor), for fitting

damping material or for reducing vertical stiffness.

Bearings with anchor plates

Freyssinet offers several solutions appropriate for different configurations, conside-

ring the variety of construction methods for structures and the stresses transmitted

by bearings.

Type B Type C

Bearings fitted with corruga-

ted outer plates to guarantee

thin connexion.

Bearings fitted with outer plates,

anchor plates and connexion

devices.

Bearings fitted with outer plates,

anchor plates and shear discs.

Elastomericbearing types

7

Bearings with sliding surface

Laminated elastomeric bearings can be fitted with a sliding surface comprising a PTFE

(polytetrafluoroethylene) sheet dipped in the elastomer of the bearing or notched in

the top thick outer plate and a sliding plate provided with an austenitic steel sheet for

decks requiring significant movement. Therefore, the built up bearing only provides

very little movement resistance (limited to PTFE/ austenitic steel friction).

Restrained bearings

Transfer of large horizontal loads in either direction can be provided using

steel guides.

Freyssinet offers neoprene and natural rubber based bearings to meet different

national or international standards (BS, AASHTO, DIN, EN, etc.). Production quality

of these bearings is guaranteed by appropriate formulation, control of mix prepa-

ration and steel plate surface treatment quality, as well as by the care applied to

construction and moulding. Internal and external inspections are made at each

production stage.

Moreover, Freyssinet conducts a policy of permanently improving its products

and research and development of new processes or materials. The rigorous

product quality control practices Freyssinet has developed have enabled the

Group to obtain CE marking to distribute its elastomeric bearings.

Productionand quality

Morethan60officesworldwide

1 bis, rue du Petit Clamart 78140 Vélizy-Villacoublay - FranceTel: +33 1 46 01 84 84 - Fax: +33 1 46 01 85 85

www.freyssinet.com May

201

0

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