TYPES OF BRIDGE BEARING PDF
TYPES OF BRIDGE BEARING PDF!
Read chapter 10 Bridge Bearings: TRB's second Strategic Highway Research Program (SHRP 2) Report S2-R19A-RW Design Guide for Bridges for Service. There are several types of mechanical bridge bearing, such as the pinned bearing, which in turn includes specific types such as the rocker bearing, and the roller bearing. Another type of mechanical bearing is the fixed bearing, which allows rotation, but not other forms of movement. Table Bearing Suitability. Movement. Rotation about bridge axis inidicated. Resistance to Loads. Type of Bearing. Plain Elastomeric Pad. Long. S.
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Laminated elastomeric bearing is manufactured through the process of vulcanization and moulding to form a homogeneous unit with layers of steel plated embedded in.
Comparing with plain elastomeric bearing, this one has higher vertical load capacity, excellent vibration and sound isolation. It types of bridge bearing ideal for bridges with short span and flyovers, etc.
PTFE top elastomeric bearing, a variation of traditional laminated elastomeric bearingfeatures a layer of PTFE bonded to top surface of the bearing.
In types of bridge bearing with lubricant in the dimples of PTFE, the bearing allows for excellent sliding movements with reduced friction coefficient.
The matting plate shall have sufficient margin on both sides beyond the PTFE pad so that even after the sliding, loads from the superstructure gets properly transferred to the PTFE pads.
The PTFE pads shall be properly bonded at the base with a base plate or a backing plate either a steel plate or a reinforced elastomeric pad with a view to eliminate or substantially minimise types of bridge bearing under loads.
Bridge articulation and bearing specification -
PTFE pads may be bonded with high temperature epoxy adhesives under factory controlled condition. Cast steel bearings are usually very costly and not easily available from the manufacturers and therefore, for medium span bridges where types of bridge bearing use of roller and rocker bearings is obligatory, R.
Since the bearings are most vulnerable part of a bridge structure, special care should be taken in the manufacture of such bearings.
A rich concrete mix of 1: Interlocking spirals are provided both vertically and horizontally for this purpose. Dowel bars with copper lining are types of bridge bearing from the pier or abutment cap up to the deck through the elliptical holes of the rollers.
These holes permit rolling of the rollers when required whereas the dowel bars prevent over-rolling of the rollers.
Bridge bearing - Wikipedia
Lead sheet of 6 mm to 10 mm thickness is used both at the top types of bridge bearing bottom of the rollers for uniform distribution of the load over the rollers.
The lead sheet also helps in easy rolling of the rollers.
- Bridge bearing - Wikipedia
- 10 Bridge Bearings | Design Guide for Bridges for Service Life | The National Academies Press
- Use of Bearings under the Bridge: 7 Types
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Rocker is nothing but a R. Unlike cast steel rocker bearing, R.
But in case of rocker, no elliptical hole is provided and the dowel bar holds the deck in a semi-hinged condition. There are several different types of bridge bearings which types of bridge bearing used depending on a number of different factors including the bridge span.
Another type of mechanical bearing is the fixed bearing, which allows rotation, but not other forms of movement. General rules  Part 2: Sliding elements types of bridge bearing Part 3: Elastomeric bearings  Part 5: Pot bearings  Part 8: