Rubber Bridge Bearing

PRODUCT OVERVIEW

VSR Elastomeric Bearings made by Vinh Hung investment and production Co., Ltd (Vinh Hung IP) are in compliance with TCVN 10308: 2014, AASHTO LRFD â?? Section 18, AASHTO M 251 â?? 96 (2011), BS5400, EN1337, KSF4420

VSR Elastomeric Bearings have been used in road bridge constructions, with a maximum load of 5000kN.



2. PRODUCT CHARACTERISTIC

Elastomeric bearings are composed of rubber and steel plates which are chemically bonded through vulcanization. The thickness of the bearing is calculated to ensure the load, displacement and rotation as the requirement.

Elastomeric bearings are simple geometric structures, bringing convenience during the installation, operation and maintenance. In addition, this type of bearing provides high resistance of vibrations impacted to the bridge span structures and piers.

1. Product Overview

VSR Elastomeric Bearings made by Vinh Hung investment and production Co., Ltd (Vinh Hung IP) are in compliance with TCVN 10308: 2014, AASHTO LRFD Section 18, AASHTO M 251 96 (2011), BS5400, EN1337, KSF4420

VSR Elastomeric Bearings have been used in road bridge constructions, with a maximum load of 5000kN.

2.  Product Characteristic

Elastomeric bearings are composed of rubber and steel plates which are chemically bonded through vulcanization. The thickness of the bearing is calculated to ensure the load, displacement and rotation as the requirement.

Elastomeric bearings are simple geometric structures, bringing convenience during the installation, operation and maintenance. In addition, this type of bearing provides high resistance of vibrations impacted to the bridge span structures and piers.

Elastomeric bearings reinforced internally with one or more steel plates, chemically bonded during vulcanisation are called laminatid elastomeric bearings.

Elastomeric bearings permit a smooth and uniform transfer of loads from beams to substructure and also allow beam rotations at the point of support due to deflection of beam under loading.

They further allow lateral and longitudinal movement of beams caused by thermal forces.

Elastomeric bearings have no moving parts and thermal expansion and contractions are supported by shear capacity of elastomers.

There is no sliding motion between bearing and beam or between bearing and abutment.

Dimensions:
Width: 300*400 & 350*450 & 250*400 & 600*700 mm According to loads and customer needs.
Height: 8 - 200 mm
According to loads and customer needs.

Types:
- Type (C2): laminated bearing with elastomer comprising steel reinforcing plates in layers and with
smooth steel plates in top and bottom.
- Type (C4): laminated bearing with elastomer comprising steel reinforcing plates in layers and with
shaped steel plates in top and bottom.
- Type (B): laminated bearing fully covered with elastomer comprising steel reinforcing plates.
- Type (F): Plain Pad bearing, Block from Neoprene Rubber

Description:
Neoprene Bearing Rubber Pads provide a uniform transfer of load from beam to structure. They permit
rotation at the bearing point due to deflection or misalignment. They absorb vibration and prevent sound
transfer, while reducing the destructive action of vibration between movable and stationary members.
They also provide for movement caused by normal expansion and contraction.
Meets Standard Specifications for Highway Bridges, Fourteenth Edition 1989, Division II, Section 25-
Elastomeric Bearings, and EN13373-, and AASHTO Standard Specifications for Transportation Materials
and Methods of Sampling and Testing, Seventeenth Edition, M251.
Neoprene Bearing Pads are used extensively in bridge structures and prestressed and precast concrete
buildings. Also used in industrial machinery and heavy equipment applications

If, on the contrary, a fixed bearing is desired, guides are added parallel to both axes, so that movement is completely blocked.

Each elemental layer, subject to stresses and movements, deflects

Elastomeric bearings we have defined so far are the basic types, which constant feature is the fact that they allow all-ways movements and rotation.

However, movements can be limited in one or all ways, thus obtaining guided or fixed bearings, respectively.

In the first case -guided bearings- the restriction is obtained by means of guides parallel to the supporting axe that allows movement.

To make friction as low as possible, PTFE and stainless steel sheets are welded to the guides.

High damping rubber bearing (HDRB) were developed in 1985 by Professor James Kelly at the University of California at Berkeley.

Ozdekan was the first company which manufactured and applied this technology in Turkey, using it in 2014 for the AFAD building in Ankara, Turkey.

The isolating system was designed with consultation by engineers.

Ozdekan was the first company in Turkey which developed the lead rubber bearings with consultation of university researchers.

The HDRB isolators are composed of a series of vulcanized rubber layers separated by reinforcing steel plates, thus providing a device capable of supporting high vertical loads with minimal compression (elevated vertical stiffness) and allowing high horizontal displacements with relatively small reactions (low horizontal stiffness).

The main property of the rubber is its ability to dissipate energy (damping capacity). When positioned underneath a building or bridge beams, they have the effect of increasing the structure's fundamental vibration period, thus greatly reducing any effects of seismic activity.

The HDRB isolators are bolted to external metal plates allowing them to be fixed to the adjacent structures using anchor brackets or bolts.