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What is the function of cable supports for highway bridges

Source：www.jswanbao.com Release date： 2026-06-22

1、 Transmitting the enormous pulling force of the cable and dispersing the load
The tension force, vehicle live load, and self weight of the inclined cable are all transmitted to the main beam or bridge tower through the support, avoiding direct compression of the concrete beam/tower body by the cable.
Disperse the concentrated cable force into uniform surface pressure to prevent local pressure cracking and corner collapse of beams and tower columns.
Balance the tension of multiple cables to ensure uniform force distribution throughout the bridge and reduce local stress concentration.
2、 Adapt to various displacements and deformations of bridges (core function)
Temperature, vehicle load, and concrete shrinkage and creep can cause the beam to expand, rotate, and deflect, and the support provides sliding/rotating space:
Longitudinal expansion and contraction: The main beam elongates and shortens due to temperature fluctuations, and the support allows the cable to slide back and forth with the beam;
Vertical rotation: The main beam of the vehicle crossing the bridge is bent downwards and arched upwards, and the support can rotate slightly to avoid cable bending and fatigue fracture at the bend angle;
Lateral displacement: Wind load, earthquake, and lateral load cause lateral displacement, and the support releases lateral deformation constraints;
Prevent the cable from generating additional secondary bending moments and significantly delay the fatigue damage of the steel cable.
3、 Shock absorption and vibration suppression to prevent cable wind, rain, and vortex vibrations
The support is equipped with rubber damping and vibration reduction blocks, which consume wind-induced vibration energy and reduce the significant swing of the cable;
Reduce cable wear, anchor head loosening, and weld cracking caused by vibration, and extend the service life of cables;
Buffer the impact load during earthquakes and reduce the rigid impact between cables, beams, and towers.
4、 Anchoring, positioning, adjustable cable force
As the bearing base of the cable anchor, fix the cable end and firmly lock the tensile stress;
Matching adjustment pad, jack support pier, and later adjustable cable tension force:
Re tension when stress relaxation and settlement deformation occur after opening to traffic;
Balance the forces on each cable, correct the shape and elevation of the main beam.
Correctly limit the installation angle of the cable, ensure the design inclination angle, and prevent deviation.
5、 Sealed protection, extending the service life of cables and bridge structures
The support is equipped with a waterproof seal and dust-proof sheath, which isolates rainwater, mist, melting salt, and dust from entering the interior of the anchor head;
Protect anchors, steel strands, and anti-corrosion grease from corrosion and reduce rusting;
Isolate sediment friction to avoid wear and damage to the outer skin of the cable.
6、 Wind resistant and earthquake resistant safety buffer
Under strong winds and earthquakes:
The flexible buffering structure absorbs impact energy and prevents the cable from being instantly overloaded and broken;
Limit the extreme swing amplitude of the cables to prevent them from colliding with each other or hitting the main beam.

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