Core Application Scenarios Of Friction Pendulum Bearing (FPB)

Friction Pendulum Bearing (FPB), featuring core advantages such as self-centering, friction energy dissipation, large displacement adaptability and high vertical load-bearing capacity, can effectively isolate seismic energy and reduce structural vibration response. It is widely used in various buildings and bridge projects in high-intensity seismic zones, especially suitable for special structures with strict requirements on safety and stability. Specific application scenarios are as follows:

1. Applicable ScenariosSuper high-rise residential buildings, commercial complexes, skyscraper office buildings and other structures exceeding 100 meters in height. Such buildings have a high center of gravity and are sensitive to seismic response, which are prone to structural damage due to excessive horizontal displacement.

2. Technical Value

• By virtue of the simple pendulum motion mechanism of FPB, the natural vibration period of the building is prolonged to avoid the predominant period of seismic waves, thus significantly reducing the horizontal shear force under seismic action.
• The Hyperbolic Friction Pendulum Bearing (HSFPB) can achieve bidirectional horizontal displacement adaptation, meeting the multi-dimensional deformation requirements of super high-rise buildings under strong earthquakes. Meanwhile, it realizes self-centering after earthquakes relying on its own curvature without additional reset devices.

3. Selection PointsPriority shall be given to FPB with large curvature radius and high vertical load-bearing capacity, combined with damping-enhanced products (such as lead-core composite friction pendulum bearings) to improve energy dissipation capacity.

1. Applicable Scenarios

Continuous beam bridges, cable-stayed bridges, cross-sea bridges, high-speed railway bridges, urban rail transit bridges, etc. Such projects have large spans and high structural flexibility, imposing extremely high requirements on the displacement adaptability and durability of bearings.

2. Technical Value

• Resisting seismic loads: Under strong earthquakes, FPB limits the horizontal displacement of the main beam of the bridge through friction energy dissipation on the sliding surface, preventing the beam body from colliding with abutments or piers and causing damage.
• Adapting to temperature deformation: It has dual functions of seismic isolation and temperature expansion compensation, solving the linear deformation problem of long-span bridges caused by temperature differences, and replacing the traditional combination scheme of expansion joints and bearings.
• Special advantages for rail transit: It reduces the vibration transmission during train operation, improves riding comfort, and ensures the integrity of the track structure during earthquakes.

3. Selection Points

For cross-sea bridges, corrosion-resistant FPB shall be selected (the sliding surface adopts stainless steel + modified polytetrafluoroethylene, and the bearing body is coated with anti-corrosion coating); for high-speed railway bridges, the friction coefficient of bearings shall be strictly controlled to avoid excessive displacement caused by train braking.

1. Nuclear Power Plant Buildings

• Core Requirements: As Class I seismic fortification buildings, it is necessary to ensure that key facilities such as reactors and main control rooms do not fail under rare earthquakes.
• FPB Application Value: It isolates seismic energy to prevent radioactive material leakage; the bearing has anti-lifting and anti-overturning capacity to adapt to the heavy-load characteristics of nuclear power plant equipment.

2. Hospitals, Fire Command Centers and Emergency Shelter Sites

• Core Requirements: Functions shall remain normal after earthquakes to support disaster relief work.
• FPB Application Value: It reduces the degree of building seismic damage, ensures the operational safety of medical equipment and rescue facilities, and avoids the interruption of rescue work due to structural damage.

3. Protection of Cultural Relics and Historic Buildings

• Applicable Scenarios: Ancient building halls, ancient towers, grotto temples and other immovable cultural relics. Most of these structures are made of brick, stone and wood materials, with poor seismic performance and high repair difficulty.
• FPB Application Value: FPB with low friction coefficient and small displacement is adopted. On the premise of not damaging the original structure of ancient buildings, seismic energy is absorbed through the isolation layer to reduce the vibration response of the main structure, realizing the protection goal of "repairing the old as the old".

1. Applicable Scenarios

Large workshops, metallurgical plants, precision instrument production bases, heavy-duty equipment foundations (such as rolling mill and generator foundations).

2. Technical Value

• It isolates the two-way transmission between equipment operation vibration and external earthquakes: it not only prevents equipment vibration from affecting the stability of plant structures, but also avoids seismic damage to high-precision production equipment.
• Lead-core composite friction pendulum bearings can provide higher damping ratio, effectively suppressing resonance during equipment operation and improving production accuracy.

3. Selection Points

Customize FPB with high load-bearing capacity and adjustable damping according to equipment weight and vibration frequency. The bearing shall have good fatigue resistance to adapt to long-term dynamic loads.

1. Applicable Scenarios

Subway stations, underground pipe galleries, integrated transportation hubs, large parking lots and other underground structures.

2. Technical Value

• Underground structures are vulnerable to seismic secondary disasters (such as sand liquefaction and foundation settlement). FPB can adapt to vertical deformation caused by uneven foundation settlement and resist horizontal seismic force.
• It improves the seismic resilience of underground space, prevents subway tunnel collapse and pipe gallery fracture, and ensures the normal operation of urban lifeline systems.

3. Selection Points

Select sealed FPB to prevent groundwater and sediment from invading the sliding surface and affecting bearing performance; match with pre-embedded anchorage structure to enhance installation stability.