What are the advantages of cable supports for highway bridges
1、 Normal operation phase: Inheriting the basic characteristics of high-performance bearings
1. High vertical bearing capacity and excellent rotational ability
Relying on spherical/bowl shaped bodies, it can withstand large tonnage vertical loads; Spherical universal rotation, suitable for deflection and warping deformation of the main beam under live load, without generating additional be
1、 Normal operation phase: Inheriting the basic characteristics of high-performance bearings
1. High vertical bearing capacity and excellent rotational ability
Relying on spherical/bowl shaped bodies, it can withstand large tonnage vertical loads; Spherical universal rotation, suitable for deflection and warping deformation of the main beam under live load, without generating additional bending moments, suitable for large-span highway continuous beams and steel box beams.
2. Free adaptation to temperature, shrinkage and creep displacement
Under normal operating conditions, the cable is in a relaxed state and does not constrain the normal sliding of the support; The PTFE skateboard has a low friction coefficient, allowing for smooth release of longitudinal expansion and slight lateral displacement without altering the conventional stress system of the bridge.
3. Clear force system and strong design compatibility
Under small earthquakes and conventional loads, it is equivalent to ordinary fixed/movable bearings. The static calculation mode is mature and easy to match with existing highway bridge design specifications.
2、 Seismic conditions: core differentiation advantages
1. A graded working mechanism to achieve "normal small earthquakes and isolated large earthquakes"
Minor and frequent earthquakes: the anti shear pin does not cut, maintaining the original support constraint state;
Rare Strong Earthquakes: Shear pins are sheared, bearings are transformed into frictional sliding isolation systems, the natural vibration period of the structure is elongated, the seismic shear force of bridge piers is reduced, and the pier columns are protected from severe plastic damage.
2. Proactively limit and prevent the risk of falling beams from the root
After the slip exceeds the preset stroke, the surrounding steel cables are tensioned to strictly limit the relative displacement of the pier and beam;
Addressing the safety hazards of uncontrolled post earthquake displacement and beam detachment from the cover beam of ordinary sliding bearings, it is particularly suitable for high-intensity areas, simply supported beams, and elevated bridges.
3. Possess self resetting ability to reduce residual deformation after earthquakes
After the earthquake slip ends, the tension of the cable provides restoring force, pushing the upper and lower seat plates of the support back to the center; Compared with ordinary friction sliding bearing, it has large residual displacement and is difficult to reset, which greatly reduces the cost of beam adjustment and repair after the earthquake.
4. Diversified energy consumption paths and good seismic stability
Relying on sliding friction for energy dissipation and elastic deformation of cables for energy absorption, it has strong adaptability to seismic spectra; Unlike rubber bearings, which are significantly affected by temperature and aging, their durability is more suitable for outdoor highway environments.
3、 Advantages of construction, construction, and operation and maintenance
1. Integrated design, simplifying on-site layout
The limit cable is directly assembled on the support body, without the need to separately install external limit devices on the pier top and main beam, reducing the number of embedded parts and anchoring structures, and lowering the difficulty of on-site construction.
2. Excellent durability and strong environmental adaptability
Corrosion prevention of main steel structure and external protection of cables; There is no problem of long-term creep and aging failure of rubber bearings, which is suitable for coastal, de icing salt, and road environments with large temperature differences between day and night.
3. Convenient maintenance and replacement
Integrated modularization of supports; If it is necessary to repair the cable and replace the shear pin in the later stage, there is no need for large-scale chiseling of concrete, and the maintenance workload is smaller compared to the external limit device.
4. Strong adaptability for renovation
In the seismic reinforcement project of old bridges, the advantages are prominent: it can directly replace the original ordinary bearings, quickly improve the seismic and anti falling ability of the bridge, and does not require significant renovation of the pier and abutment structure.
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