elastomeric bearing pads and strips brochure 2010

7/30/2019 Elastomeric Bearing Pads and Strips Brochure 2010

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Elastomeric Bearing Pads & Strips



Trelleborg Elastomerical Bearing Pads & StripsTrelleborg elastomeric structuralbearing pads and strips aremanu actured rom premium qualitynatural rubber.

The compounds comply withAS5100.4 Bearings. Alternativecompounds are available inNeoprene.

A range o hardness’s are availablerom SDH 50 to SDH 70 to suit

special applications.

The pads nominated inthe ollowing tables havebeen designed using theparameters as speci ed inAS5100.4.

Pads are also able to be designedand o ered in accordance withBS5400 and NAASRA HighwayBridge Speci cation(1976).

Shear Defection/Sti nessThe allowable shear de ormationis normally in the order o 30% to50% o the compressed pad/stripthickness rom the neutral position.Shear de ections o up to 70% may be

considered but care ul considerationmust taken o possible slippage due tothe rictional coe fcient o the rubber tostructure mating sur aces.

Vertical LoadsLoadings shown in the table are themaximum recommended working loads.At these loads a de ection o up to15% o the initial pad height could beexpected.

As these pads are not bonded to themating sur aces, the actual de ection

is determined by the rictionalcharacteristic o the contact sur aces.

Care should be taken as holes or cutouts in the pads/strips may have asubstantial e ect by reducing the loadcarrying capacity and increasing thede ection o the pad or strip.

d

Fv

t

VERTICAL

t

H

SHEAR

FV

FH



SlippageNon-rein orced bearing pads will“spread” in sur ace contact area whenunder load. The amount o “spread”is largely determined by the rictionalcoe fcients o the structures sur aces

mating with the rubber pad/strip. It isimportant to allow clearances aroundthe pad/strip to allow or this slippageonce the structures weight is imposedon the pad/strip.

RotationTilting o the load bearing sur acesrelative to each other causes a“rotation” o the bearing pad/strip. Thebasic limiting criterion is that no gapoccurs between the structure and the

pad/strip. The rotational capacity tablesinclude the 0.0035 radians that shouldbe allowed to accommodate designtolerances.

dt

ROTATION

MFv

Fv

t

Slippage Slippage

SLIPPAGE

The mating sur aces should be at,parallel and ree rom cavities, gapsor protrusions. It is pre erable or the

structures sur aces to have a roughtexture without lubrication, particularly

oils and hydrocarbons. Due to slippagewhen compressed, a gap aroundall sides o the pad/strip must be

provided. It is recommended that thisgap be a minimum o 12mm.

Installation

The bearing is restrained in lateralmovement by the rictional coe fcientbetween the rubber and the structure.The ratio o lateral load over verticalload should not exceed the ollowingvalues:

• 0.35 Elastomer/wood oat fnish

• 0.30 Elastomer/steel oat fnish

• 0.25 Elastomer/steel, elastomer/in-situ concrete nish

Friction

Rubber Speci cation:The elastomer supplied will comply with the requirements o AS5100.4 Table B3(A) Type 60H.


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Part No. Strip Working Compressive Shear Shear RotationDimensions Load per Sti ness Sti ness Capacity Capacitymm x mm Metre kN/m kN/mm/m kN/mm/m +/- mm rad

Type O 5 x 50 5 x 50 200 550 9.0 2 0.022Type O 5 x 75 5 x 75 300 1163 13.5 2 0.010Type O 5 x 100 5 x 100 400 2001 18.0 2 0.006Type O 5 x 125 5 x 125 500 3061 22.5 2 0.004Type O 5 x 150 5 x 150 600 4348 27.0 2 0.003Type O 5 x 200 5 x 200 800 7599 36.0 2 0.002

Type O 10 x 50 10 x 50 100 138 4.5 5 0.044Type O 10 x 75 10 x 75 225 309 6.8 5 0.029Type O 10 x 100 10 x 100 400 550 9.0 5 0.022Type O 10 x 125 10 x 125 500 828 11.3 5 0.014Type O 10 x 150 10 x 150 600 1163 13.5 5 0.010Type O 10 x 200 10 x 200 800 2001 18.0 5 0.006

Type O 15 x 75 15 x 75 150 138 4.5 8 0.044Type O 15 x 100 15 x 100 265 244 6.0 8 0.033Type O 15 x 125 15 x 125 415 381 7.5 8 0.026Type O 15 x 150 15 x 150 600 550 9.0 8 0.022Type O 15 x 200 15 x 200 800 933 12.0 8 0.013

Type O 20 x 75 20 x 75 110 77 3.4 10 0.058

Type O 20 x 100 20 x 100 200 138 4.5 10 0.044Type O 20 x 125 20 x 125 315 215 5.6 10 0.035Type O 20 x 150 20 x 150 450 309 6.8 10 0.029Type O 20 x 200 20 x 200 800 550 9.0 10 0.022Type O 20 x 250 20 x 250 1000 828 11.3 10 0.014

Type O 25 x 100 25 x 100 160 88 3.6 13 0.055Type O 25 x 125 25 x 125 250 138 4.5 13 0.044Type O 25 x 150 25 x 150 360 198 5.4 13 0.036Type O 25 x 200 25 x 200 640 352 7.2 13 0.027

Type O 25 x 250 25 x 250 1000 550 9.0 13 0.022

Other sizes available upon request 1. Calculations based on AS5100.4 Bearings 2. Maximum Total Load = Working Load as stated in table + 25%

3. Parameters or rubber: Hardness SDH 60, Shear Modulus (MN/m²)=0.94. For thicknesses over 5mm shear defection is 50%. For 5mm thickness shear defection is 40%5. Maximum Rotation = Rotation as stated in table + 30% (table value includes 0.0035 radians or construction tolerances).6. Tolerance on calculated sti ness value +/-20%7. Calculations based on bearing strip mounted between wood oat fnished concrete sur aces

Trelleborg Elastomeric Bearing Pads & Strips

BrisbanePhone +61 (7) 3866 7444

Facsimile + 61 (7) 3263 4912Email: tqr.in [email protected]

www.trelleborg.com.au

PerthPhone +61 (8) 9256 6000



MelbournePhone +61 (0) 407 966 291



elastomeric bearing pads and strips brochure 2010

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