What factors affect the friction coefficient of friction pendulum ball bearings for highway bridges
Friction pendulum ball bearings (FPS bearings) for highway bridges are a new type of seismic isolation bearings suitable for large-span and high seismic demand bridges. Their core characteristics revolve around three dimensions: seismic isolation performance, bearing capacity, and adaptability, as follows:
Friction pendulum ball bearings (FPS bearings) for highway bridges are a new type of seismic isolation bearings suitable for large-span and high seismic demand bridges. Their core characteristics revolve around three dimensions: seismic isolation performance, bearing capacity, and adaptability, as follows:
1. Excellent seismic isolation performance (core advantage)
Friction energy dissipation and shock absorption: The sliding surface of the support is made of low friction coefficient materials (such as polytetrafluoroethylene and stainless steel plate combination). During an earthquake, friction is generated through the relative sliding of the upper and lower supports, converting seismic energy into thermal energy consumption and significantly reducing the seismic response (such as displacement and acceleration) of the upper structure of the bridge.
Principle of pendulum isolation: Utilizing the characteristic of "pendulum motion", the rotation is achieved through the spherical contact of the support, so that the bridge can sway with a fixed "natural vibration period" (much longer than the main period of the seismic wave) during earthquakes, avoiding resonance risks and reducing structural stress.
2. High load-bearing capacity and stability
Large bearing capacity design: The spherical contact form can uniformly transmit vertical loads and adapt to the heavy load requirements of large-span bridges (such as continuous beams and cable-stayed bridges). The vertical bearing capacity of a single support can reach thousands of tons.
Strong anti overturning ability: The spherical curvature and sliding surface constraint design of the support can limit excessive lateral displacement, and further ensure structural stability under earthquakes or strong winds through limit devices (such as stoppers), avoiding support detachment or bridge overturning.
3. Good adaptability and durability
Adapt to multidimensional deformation: It can simultaneously meet the vertical rotation and horizontal displacement requirements of bridges under temperature changes, concrete shrinkage and creep, and load, without the need for additional displacement joints or rotation devices, simplifying structural design.
Strong durability: key components (such as stainless steel plate, PTFE slider) are resistant to corrosion and aging, and the sliding surface is usually filled with grease to reduce wear; Some supports are also equipped with dust-proof and waterproof devices to extend their service life (the design life can generally reach more than 50 years).
4. Easy installation and maintenance
Easy to control installation accuracy: The support structure is modular, and the bridge elevation and horizontal position can be controlled by adjusting the spherical contact position or gasket thickness to adapt to construction errors.
Low maintenance cost: No complex maintenance is required on a daily basis, only regular inspections of the wear and lubrication status of the sliding surface are needed. When local components (such as sliders) are damaged, they can be replaced separately without the need to remove the support as a whole.
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