Bridge bearings are crucial components of bridge structures, playing a vital role in transferring loads, accommodating movements, and ensuring the long-term integrity of bridges. The American Association of State Highway and Transportation Officials (AASHTO) estimates that there are over 750,000 bridges in the United States alone.
Type of Bridge Bearing | Function |
---|---|
Elastomeric Bearings | Provide vertical support and accommodate horizontal movements |
Metallic Bearings | Transfer vertical loads and allow for axial and rotational movements |
PTFE Bearings | Offer low friction and are suitable for bridges with large movements |
Material | Advantages | Disadvantages |
---|---|---|
Elastomers (e.g., rubber) | High damping capacity, low friction | Limited load capacity, susceptible to ozone and UV degradation |
Metals (e.g., steel, aluminum) | High load capacity, durable | Prone to corrosion, high friction |
PTFE (Polytetrafluoroethylene) | Extremely low friction, corrosion-resistant | High cost, sensitive to temperature changes |
Success Stories:
Selecting the appropriate bridge bearings involves careful consideration of factors such as load capacity, movement requirements, environmental conditions, and bridge design.
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FAQs about Bridge Bearings
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