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Nanwangzhuang Village, Pengdu Township, Binhu New District, Hengshui, Hebei Province
Friction pendulum bearing
- 产品描述
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Basic Principles
Extending the natural vibration period: The friction pendulum bearing utilizes the principle of a simple pendulum to extend the structure's natural vibration period through oscillation. When seismic forces act on a building, the pendulum will oscillate with the seismic waves. Because the pendulum has a relatively large mass and a long movement path, its natural vibration period is usually greater than that of the building, generally more than twice the bridge's natural period, typically in the range of 2s-6s.
Friction energy dissipation: When the ground shakes, the seismic force acting on the building is transmitted to the pendulum through the connecting components, causing the pendulum to slide. Friction is generated between the pendulum and the friction material, converting the seismic energy into frictional heat, thereby reducing the impact of the earthquake on the building.
Structural Composition
Bearing: Fixed to the ground, supporting and securing the entire device.
Connecting component: Connects the pendulum to the building, ensuring that seismic forces are effectively transferred to the pendulum during an earthquake.
Pendulum: The core component, dissipating seismic energy through spherical contact friction sliding and extending the structure's natural vibration period through oscillation.
Friction material: A key factor determining the bearing's performance, requiring good friction properties and durability.
Classification
Classification by curvature: Can be divided into single-pendulum and compound-pendulum structures. A single-pendulum structure has a large difference in curvature between the upper and lower spherical crown plates, generally using the larger radius of curvature as the design basis; a compound-pendulum structure has similar or equal curvatures of the plates. The single-pendulum structure has a larger curvature on one end, making installation inconvenient and the height lower; the compound-pendulum structure has similar upper and lower dimensions, making installation easier and the height higher.
Classification by oscillation method: Can be divided into single-surface and double-surface structures. Single-surface structures, such as the three-sliding-surface bearings of Hengshui Baoli, have the retaining ring sheared off during an earthquake, and the lower pendulum drives the bridge to start oscillating; double-surface structures have the lower part turning the upper pendulum, suitable for design requirements with larger displacements.
Performance Advantages
High load-bearing capacity: Can withstand large vertical and horizontal loads, meeting the support needs of large buildings, bridges, and other structures. The currently designed maximum load-bearing capacity can reach 180MN.
Good durability: The materials and structural design provide a long service life, generally 60-80 years, and the seismic mechanical properties do not change significantly during use.
No damage under large deformation: During an earthquake, it allows for large deformations without damage, effectively protecting the safety of the upper structure.
Strong reset function: After an earthquake, the structure automatically returns to its initial position due to its own weight and friction, reducing post-earthquake repair work and costs.
Applications
High-rise buildings: Effectively reduces earthquake damage to high-rise buildings, improving the building's seismic performance and ensuring the safety of personnel and property.
Bridge engineering: Widely used in bridge construction, especially for large-span bridges and bridges in high-intensity seismic zones. It can extend the bridge's natural vibration period, dissipate seismic energy, and prevent disasters such as bridge collapse.
Large oil storage tanks: Protects large oil storage tanks during earthquakes, reducing tank shaking and damage, and preventing accidents such as oil spills.
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Nanwangzhuang Village, Pengdu Township, Binhu New District, Hengshui, Hebei Province
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