presentatie bridge hagestein

8/9/2019 Presentatie Bridge Hagestein

http://slidepdf.com/reader/full/presentatie-bridge-hagestein 1/19

22/03/2012 1

Bridge Hagestein

Modified sliding elements and guides in

new bearings

J.S.Leendertz, Ministry of Transport NL



22/03/2012 2

• 3 Span plate girder twin bridge on Motorway A27• Built 1980

• Each bridge: 2 main girders, H = 3.5, at piers 5.8 m,crossbeams c.o.c. 4.0 m, orthotropic steel deck• Each bridge is supported by 8 spherical bearings

• 100.000 vehicles/day, incl. 14.000 lorries(Northbound + Southbound)



22/03/2012 3



22/03/2012 4

Support system after renovation



22/03/2012 5

Dimpled PTFE-disc with remains of lubricant



22/03/2012 6

Discussion on damages:

1. Black grease

2. Dimples

3. Lipping (circular, or one sided)

What is the mechanism behind it?



22/03/2012 7

Worn out Guide



22/03/2012 8

Discussion on state of guides:

1. Where is the DU-B (or CM) material

2. Worn out steel surfaces

What might be the mechanisms?



22/03/2012 9

Vertical deflections and rotations undertraffic loads



22/03/2012 10

Longitudinal shift and rotations of bearingsfor midspan load

Rotation of bridge cross section aboutshear centre



22/03/2012 11

Combination of rotation and transverse effects (effectof bearing centre to neutral axis distance excluded)



22/03/2012 12

The sliding elements must fulfil the followingrequirements:

1. Contact stresses not too high to limit extrusion of

PTFE (lipping)2. Contact stresses not too low to maintain the sealingeffect

3. No partial separation to avoid redistribution oflubricant and danger of dislocation of PTFE



22/03/2012 14

t 0m

t t 20m 10.000m

t 10.020m

t t 10.040m

d EN1337

MPA T1 -35 T 2 +35 T 3 +21 +21 T +30 T 1 -35 T 2 +35 T 3 +21 press ure=30 0.023

(0.008)0.006(0.003)

0.008-

press ure=50-

0.054(0.022)

0.025(0.008)

0.027- (0.030)

GLACIER - - T room T room - - - press ure=30 - -

0.011 Start0.009 End

press ure=280.011 Start0.010 End0.023 After dwell

- - -

0,00

0,02

0,04

0,06

0,08

0,10

coefficient of frictionµm

ax

-40

-20

0

20

40

60

temperature T

100 200 300 400 900 1000 1100 number of strokes n1

0 2 4 6 8 16 18 20 22 total slide path s t

PTFE white

m

µ

T

T (comparison test))

°C

Coefficient of friction for model bearings with a dimple greased (silicon grease) PTFE+UHMWPE ring systemor PTFE as sliding element and austenitic steel as mating surface at the end of a long term test with a total slide

path of about 10000 m

p= 30 MPa, s = 0...10 mm, v = 0,4 mm/s, t v,u = 1 h(with PTFE+UHMWPE ring p = 50 MPa for most of the long term test)

VirginPTFE

PTFE +UHMWPERing



22/03/2012 15

Testing location Specimen type Wear products(g)

Decrease of protrusion(mm)

Observations

MPA p=50

PTFE +UHMWPE-ring

2.2

19.5

5000m: 0.6810.000m: 0.625000m: 0.68

10.000m: 2.20

Severe lipping of ring insliding direction, 4.3 - 5.4mmPartial collapse of ring in

direction perpendicular tothe sliding direction, 4.8 -5.0mm

MPA p=50

PTFE - - Worn out after 2500m

Glacier p=30

PTFE +UHMWPE-ring

0.1250.084

- Minor lipping, 0.9mmMinor lipping, 0.8mm

Wear:



22/03/2012 16

Test specimen for guides

Testinglocation

t 0m

t t

20m 10.000mt

10.020mt t

10.040md

EN 1337MPA T 1 -37 T 2 +35 T 3 +21 Controlled Temp. at

MPA

T1 -37 T 2 +35 T 3 +21

UHMWPE pres sure=30

0.040 0.010 0.012 pressure=50 0.098 0.042 0.047 -

PTFE pres sure=30

0.110 - 0.040 pressure=30 0.107(5000m)

- 0.060 0.060

CM1 pres sure=75

0.137 - 0.047 pressure=75 0.151(5.000m)

- 0.065 0.080

Testing locationMPA

Specimen type Wear production(g)

Decrease of protrusion(mm)

Observations

p=50UHMWPE-strip none

none

5000m: 0.5510.000m: 0.425000m: 0.5310.000m: 0.80

Lipping 1.3 - 1.8mm

Lipping 3.4 - 4.6mm

Friction coefficients

Wear



22/03/2012 17

0,00

0,02

0,04

0,06

0,08

0,10

0,12

0,14

0,16

coefficientoffrictionµ

max

-80

-60

-40

-20

0

20

40

60

80

temperature T

100 200 300 400 900 1000 1100 number of strokes n1

0 2 4 6 8 16 18 20 22 total slide path s t

DU-B (5 km-comparison test) *PTFE stripes (5 km-comparison test) *

m

µ

T

T (DU-B-comparison test)

DU-B

PTFE

PE

°C

Coefficient of friction for model bearings with initially lubricated strips of UHMWPE, CM 1 (DU-B)and unlubricated PTFE as sliding element and austenitic steel as mating surface for the last 22/20 m ofa long term test. Total slide path of about 10.000 m for UHMWPE and 5000 m for PTFE and CM 1s = 0...10 mm, v = 0.4 mm/s, t v,u = 1 h,

p= 30 N/mm 2 for UHMWPE and PTFE, p= 75 N/mm 2 for CM 1(with UHMWPE p = 50 N/mm 2 for the long term test)



22/03/2012 18

R 8 0 0

R 8 0 8

1 4 1

1 2 2

3 0 3

1 5 2

750

ø570

ø530

ø490

1080



22/03/2012 19

Experiences until now and conclusions:

•

The bearings show almost no wear after 7 years ofservice

• The sliding systems provide a with respect to frictioncoefficients reasonable and very durable solution

• The supports for the guides show to be susceptible tofatigue

And:Solving one problem can introduce other problems

presentatie bridge hagestein

Documents