CROSS Safety Report
Importance of bearings
This report is over 2 years old
A reporter is concerned that the long-term characteristics and behaviour of bearings are often underestimated.
Key Learning Outcomes
For civil and structural design engineers:
It is important to leave sufficient space around bearings for inspection and replacement and that maintenance regimes specify how often inspection should take place
A useful reference is the Construction Industry Research and Information Association (CIRIA) publication Safe access for maintenance and repair - Guidance for designers, second edition 2009.
For asset owners and managers:
Regular inspections and maintenance should be carried out in accordance with the specification to ensure bearings do not deteriorate
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Bearings are an important component of the superstructure. A reporter says that they are often underestimated in their long-term characteristics and behaviour. This includes strength, space for inspection, types of connection and anchorages, and ease of replacement.
It is vitally important to have regular inspections of bearings and seatings with maintenance as required and the facility to replace faulty components.
The reporter wonders whether any systematic study on the overall issues of bearing assembly and associated requirements has been done.
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The reporter is correct that bearings are important components of bridges and buildings and they may well be neglected. It is important that designers leave sufficient room around bearings for inspection and replacement and that maintenance regimes specify how often inspection should take place. Seized bearings can result in unknown loads being generated and affecting serviceability and ultimate performance.
Failure of the bearings under the Thelwall viaduct on the M62 in 2004 resulted in reported replacement costs of £52 million. There have been other cases where it has been necessary to partially dismantle a structure to maintain or replace bearings. Statements such as ‘designed for life’ or ‘maintenance free’ have to be treated with considerable caution.
A useful reference in this regard is the Construction Industry Research and Information Association (CIRIA) publication Safe access for maintenance and repair - Guidance for designers, second edition 2009.