freyssinetelastomericbearings

Elastomeric bearings

Elastomeric bearings

summary

3

4

6

7

Applications

Dimensions

Elastomeric bearing types

Production and quality

Omnisports Palace at Paris-Bercy - France.

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.

Applications

3

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 clearance around the bearings so they can

be monitored and possibly replaced.

Clichy Bridge - France.

Cruas Nuclear Power Plant - France.

compression rotation horizontal deformation

Allowablerotation

Allowabledisplacement

Totalthickness of

bearing

Totalelastomerthickness

Thicknessof thicker

steel plates


Totalthickness of

bearing


TYPE B TYPE C

Reinforcingplates

thickness

Numberof reinforcing

plates(TYPE B)

Numberof layers

Layerthickness

Compressionload under zerodisplacement

Plandimensions of

bearings

axb, D F t n ns ts Te T w Ts Te T w α

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

DimensionsThe 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.

2131

101520

8101316

91419

81216

68

101214

91114

579

1012

8101315

79

111315

7101215

79

111214

78

101213

79

1113

678

101113

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

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

4860728496108

2129

212937

29374553

212937

212937

2937455361

374553

2937455361

41536577

4153657789

41536577

53657789101

53657789101

41536577

53657789101113

15

15

15

15

15

15

15

15

20

20

20

20

20

20

20

23

234

3456

234

234

34567

456

34567

3456

34567

3456

45678

45678

3456

456789

34

345

4567

345

345

45678

567

45678

4567

45678

4567

56789

56789

4567

56789

10

8

8

8

8

8

8

8

8

12

12

12

12

12

12

12

3

3

3

3

3

3

3

3

4

4

4

4

4

4

4

120179

408558715

803104312911547

625

1578

16082425

2230

3598

203627873569

3091

3220

4454

5778

5204

6991

100x150100x200

150x200150x250150x300

200x250200x300200x350200x400

Ø200

Ø250

250X300250X400

Ø300

Ø350

300X400300X500300X600

350X450

Ø400

400X500

400X600

Ø450

450X600

4

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

5

Allowablerotation


Totalthickness of

bearing


Thicknessof thicker

steel plates


Totalthickness of

bearing


TYPE B TYPE C

Reinforcingplates

thickness

Numberof reinforcing

plates(TYPE B)

Numberof layers

Layerthickness

Compressionload under zerodisplacement

Plandimensionsof bearings

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

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

84100116132148

100116132148164180196

100116132148164

109130151172193214

109130151172193214

109130151172193214235

109130151172193214235

125150175200225250275

125150175200225250275300

3648607284

4860728496

108120

4860728496

648096

112128144

648096

112128144

648096

112128144160

648096

112128144160

80100120140160180200

80100120140160180200220

20

20

20

20

20

20

20

20

20

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

4

4

4

5

5

5

5

5

5

45678

56789

1011

56789

56789

10

56789

10

56789

1011

56789

1011

56789

1011

56789

101112

34567

456789

10

45678

456789

456789

456789

10

456789

10

456789

10

456789

1011

12

12

12

16

16

16

16

20

20

6848

8262

882512561

8214

10329

137491055313949

16772

150541158814804

2197116951

Ø500

500x600

Ø550Ø600

600x600

600x700

700x700Ø700Ø750

700x800

800x800Ø800Ø850

900x900Ø900

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.

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, considering

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

bearings.

Elastomeric bearing types

Type CType B

Bearings fitted with

corrugated outer plates

to guarantee thin connexion.


outer plates, anchor plates

and shear discs.


outer plates, anchor plates

and connexion devices.

Section of a standard bearing.

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.

Production and quality

Freyssinet offers neoprene and natural rubber based bearings to meet different natio-

nal or international standards (BS, AASHTO, DIN, EN, etc.). Production quality of these

bearings is guaranteed by appropriate formulation, control of mix preparation 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.

7

1 bis, rue du Petit Clamart

78140 Vélizy-Villacoublay - France

Tel.:+33 1 46 01 84 84 - Fax:+33 1 46 01 85 85

www.freyss inet .com mar

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