Elastomeric Bridge Bearing: Download

Elastomeric Bridge Bearing provide higprovide high quality Elastomeric Bridge Bearings, also called neoprene bridge bearings, Bridge Bearing and elastomeric bearings. These bearings are manufactured using high grade materials (CR, Black Carbon Reinforcement, and Other  Chemical with the aid of contemporary techniques at our advanced production unit. The bearings provide adequate support to bridges for absorbing vibrations and preventing their deformation. In addition, we offer these Elastomeric Bridge Bearings at reasonable prices.

Features

  • Extended durability 
  • Excellent flexibility under lateral load 
  • Easy to install

We are one of the eminent manufacturers and suppliers of Elastomeric Bridge Bearing Pads. These pads are manufactured using the finest quality material, procured from reliable vendors under the observation of seasoned professionals. Offered pads are checked at our well-equipped facility on various parameters to ensure its long service life. These pads provide economical solution used to withstand loads and deformation in any direction for the

construction of large-span bridges and buildings. Elastomeric Bridge Bearing Pads are available at industry leading prices.

Application

Laminated elastomeric bearing or neoprene bridge bearing pads are simple to install as contrast with different sorts of bearings deployed and demand zero handling. Dissimilar to numerous elastomer, neoprene rubber experiences no marked contraction at least temperatures when bridge neck thermal contraction is performed at optimum; as such contraction can be harmful to structure and bearing. Suitably compounded and precisely outlined bearings can be anticipated to work productively for minimum 15 years.

As utilitarian bearings for sell beams, pre-stressed concrete or pre-cast concrete in buildings and bridge are imperative, our elastomeric bridge bearings allow uniform and smooth transfer to load through beam to the frame as well as permit beam revolution for bearings because of beam deflection under load. These also permit longitudinal and lateral beam movement that is induced by heat pressures. They do not possess any movable components. In addition, thermal contraction and expansion are assimilated by ability of pad to offer and take shear. No sliding movement between pad and abutment or between pad and beam is present.

Benefits

Our bridge deck are composed of numerous elastomeric material laminates that is separated through steel supports. The complete bearing size and laminate thickness is as per demand of transferred load. Bearings possessing steel plates are supported should be compresses or cast vulcanizes or molded as one unit in mold below heat and pressure.

Testing Of Our Bearings

In house manufacturing test of every bearing is completed in the presence of the client or his representative. Trials adhere to IRC 83 PART II/UIC772, Spec – EN-1337-3. Particulars are as per affirmed examination on either level 2 or level 1 or long and short duration’s compression trails of approximately 800 ton with levelled shear load of around 150 ton can be tested in our facility.

Four Type of Test Conducted on Finish Bearing after 7 day of Manufacturing before 6 month as per specification

1.     Elastic Modula’s Test.

2.     Shear Modula’s Test.

3.     Adhesion Strength

4.     Compression Test                                                                           

Role of the Elastomeric Bearing Pad

Bridge flexibility is primarily achieved by a component called bridge elastomeric bearing pad. This is typically made of a strong and pliable material such as neoprene—a type of heavy-duty industrial rubber. These pads are placed in between superstructures such as the bridge beam and substructures such as the vertical supports called piers. Their primary function is to distribute superstructure loads to the substructure and allow the superstructure to undergo necessary movements in irregular environmental conditions without creating any harmful stresses that might compromise the structural integrity of the bridge. When the structural integrity of the bridge is compromised, the bridge could collapse.

Preventing collapse is not the only function of an elastomeric bearing pad. The pads extend the life of bridges by reducing wear and tear on bridge materials. The pads help governments save money by delaying the replacement of bridges, much like the way shoes allow human beings to walk long distances.

Incidentally, elastomeric bearing pads were installed at the location of the Bay Bridge failure as part of a 1999 seismic retrofit project.

ELASTOMERIC DESIGN3D Engineering Simulation in Bridge Design

Finite element analysis of a bridge elastomeric bearing pad carried out with SimScale

Because bridge elastomeric bearing pads are crucial for a safe and cost-effective bridge design, they are extensively prototyped and tested before they are used in production.

Using a simulation software like SimScale as part of the process, it is possible to virtually test an elastomeric bearing pad under different design and load assumptions. For example, the bearing pad can be assumed to be composed of an elastomeric material reinforced by steel plates, and three basic load cases can be simulated and observed: 1) compression, 2) compression with shearing, and 3) compression with rotation.

The results can be analyzed by observing Cauchy stresses in a contour plot. One can even observe that with the introduction of steel plates, the load-carrying capacity of the bearing is enhanced.

ELASTOMERIC BEARING PADConclusion

As we have seen, designing elastomeric bearing pads using simulation software play a crucial role in bridge safety, dependability, and longevity. If you want to give it a try, create a free Community account here and then copy this template of an elastomeric bearing pad simulation, change the settings or the CAD model and perform your own analysis.

You can learn more about the role of engineering simulation in construction applications by downloading a free infographic here.

Set up your own simulation via web in minutes by creating a free account on the SimScale platform. No installation, special hardware or credit card is required.

The Bay Bridge was designed to withstand earthquakes by implementing technology that allowed the bridge to adapt to such dramatic environmental instances. In fact, all bridges are designed to be moderately flexible with an embedded “bend or break” design philosophy; it is assumed that the bridge will be subject to somewhat unpredictable external forces and torques caused by high wind speeds, temperature changes, heavy traffic, and sometimes even earthquakes. So if flexibility is crucial, how is it achieved?

The San Francisco-Oakland Bay Bridge

 

Properties of Elastomer

Physical Properties Unit Specified Test Method
1 Hardness IRHD 60 +5 IS:3400 (Part II)
2 Minimum Tensile Strength (Moulded Test Piece,                   Test Piece from Bearing          MPa                     17.0                 14.0                            IS:3400 (Part I)
3 Minimum Elongation at Break (Moulded Test Piece,                   Test Piece from Bearing           %                     400       350                             IS:3400 (Part I)
4 Maximum Compression Set (24h,100 +1oC) % 35 IS:3400 (Part X)
Accelerated aging (72h,100 +1oC) Maximum Change from un-aged Value  
5 Maximum Change  in Hardness IRHD +5 IS:3400 (Part IV)
6 Maximum Change in Tensile Strength % -15 IS:3400 (Part IV)
7 Maximum Change in Elongation % -30 IS:3400 (Part IV)
8 Shear Modulus at Nominal Temperature G.MPa 0.9 (+0.18)  
9 Ash Contant % 5.        Max IS:3400 (Part XII)
10 Plymers % 60.0min IS:3400 (Part XII)

 

Typical Size of Laminated Bearings

Dimension EBB

Dimension SL

No of                                                                                                                                                                                                                                                                                                                                                                    SL

Total Thick of Steel mm

Total   Middle Elastomer Thickness

Total  Top and Botoom Elastomer Thickness

Thick                                                                                                                                                                                                                                                                                                                                                                           T & B Elastomer

No of                                                                                                                                                                                                                                                                                                                                                                Layer

Thick

No of Layer

Total                                                                                                                                                                                                                                                                                                                                                        Thick of                 EBB

Length

Width

Thick

Length

Width

Thick

1

100

100

25

88

88

3

3

9

8

8

4

2

8

1

25

2

200

100

30

188

88

3

2

6

16

8

4

2

8

2

30

3

200

200

33

188

188

3

3

9

16

8

4

2

8

Diagrams