PTFE sliding elastomeric bearings are engineered to provide superior performance in structural applications, particularly in bridges and large-span constructions. Their design combines the flexibility of elastomers with the ultra-low friction properties of PTFE (polytetrafluoroethylene), enabling smooth movement, high load-bearing capacity, and durability. Key attributes include self-lubrication, adaptability to rotational and horizontal displacements, and effective vibration isolation, making them ideal for dynamic structural loads and seismic activity. These bearings are also maintenance-free and cost-efficient due to their simple yet robust design.
Key Points Explained:
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Low Friction Coefficient
- PTFE exhibits the lowest coefficient of friction among known solids, especially when paired with polished stainless steel. This ensures free sliding under vertical loads, reducing resistance during thermal expansion, seismic shifts, or live load movements.
- The friction coefficient decreases further under pressure, enhancing performance in high-load scenarios.
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Self-Lubricating Design with Dimpled PTFE Surface
- PTFE sliding pads often feature dimples or recesses to retain lubricants (e.g., silicone grease), ensuring consistent smooth movement over time.
- This design minimizes wear and eliminates the need for external maintenance, even in harsh environments.
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High Compressive Strength
- PTFE can withstand pressures up to 200 kgf/cm² (2900 psi), doubling the capacity of traditional materials like neoprene. This makes it suitable for heavy vertical loads in large-span bridges or high-rise structures.
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Flexibility and Rotational Adaptability
- The elastomeric core allows the bearing to accommodate beam end rotations without losing structural integrity.
- Superior shear deformation capacity enables horizontal displacement absorption, critical for seismic zones or dynamic loads.
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Vibration and Shock Isolation
- The combination of PTFE and elastomer layers provides excellent buffering, reducing impact forces from live loads (e.g., traffic) and earthquakes.
- This isolation effect prolongs the lifespan of both the bearing and the structure it supports.
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Durability and Maintenance-Free Operation
- PTFE’s inherent properties resist corrosion, UV degradation, and chemical exposure.
- Self-lubrication and dirt absorption capabilities ensure long-term performance without servicing.
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Cost-Efficiency and Ease of Installation
- Simple fabrication and modular design reduce installation time and costs.
- Predictable performance under worst-case conditions (e.g., temperature extremes) minimizes lifecycle expenses.
These features collectively make PTFE sliding elastomeric bearings a reliable choice for modern infrastructure, balancing technical excellence with practical economic benefits. Their role in ensuring structural safety and longevity is often understated yet indispensable.
Summary Table:
| Feature | Description |
|---|---|
| Low Friction Coefficient | PTFE offers ultra-low friction, especially with stainless steel, reducing resistance during movement. |
| Self-Lubricating Design | Dimpled PTFE surfaces retain lubricants, ensuring smooth operation without maintenance. |
| High Compressive Strength | Supports up to 200 kgf/cm² (2900 psi), ideal for heavy vertical loads. |
| Rotational Adaptability | Elastomeric core accommodates beam rotations and horizontal displacements. |
| Vibration Isolation | PTFE-elastomer layers buffer shocks from traffic or seismic activity. |
| Durability | Resists corrosion, UV, and chemicals for long-term performance. |
| Cost-Efficiency | Simple design reduces installation and lifecycle costs. |
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