LNR Horizontal Force Distribution Rubber Bearing: Principle, Features and Applications

Structurally, the LNR horizontal force distribution rubber bearing features a premium composite laminated structure composed of multi-layer high-quality natural rubber and thick reinforcing steel plates. Internal uniformly arranged steel plates effectively constrain the radial deformation of rubber materials, delivering high vertical stiffness and stable vertical load-bearing capacity to support bridge deck dead loads and vehicle live loads steadily, while the outer rubber layer protects internal steel components from oxidation, corrosion and aging to extend service life. Different from ordinary plate rubber bearings that are simply placed between beam bodies and piers and fixed only by friction, the LNR bearing is equipped with integrated top and bottom embedded steel plates and complete anchoring structures. This rigid connection with bridge superstructure and substructure completely avoids sliding, dislocation and detachment under frequent vehicle impact, strong wind and dynamic loads. The series is scientifically divided into LNR-G fixed type and LNR-H sliding type, and the combined application of the two types forms a balanced and reliable bridge force-bearing system.

The unique working principle of LNR bearings is the core of its superior performance, covering three key functions: vertical load bearing, uniform horizontal force distribution and automatic elastic reset. In the vertical direction, the steel-reinforced composite structure ensures sufficient rigidity to bear various vertical loads and maintain the overall stability of bridge structures. In the horizontal direction, when bridges face temperature expansion and contraction, vehicle braking force, wind load and seismic impact, the high-elastic rubber layers produce flexible and controllable shear deformation to adapt to structural displacement. Unlike traditional ordinary rubber bearings that concentrate all horizontal loads on a single fixed pier and cause severe local stress concentration, pier cracking and beam offset, the LNR bearing group evenly disperses horizontal forces to all bridge piers, realizing collaborative stress bearing of the entire bridge and fundamentally eliminating structural damage caused by unbalanced force. After external loads disappear, the high-quality natural rubber material delivers excellent elastic recovery performance, enabling the bearing to automatically return to the original design position without residual deformation, ensuring long-term stable operation of the bridge.

Compared with conventional plate-type laminated rubber bearings, LNR horizontal force distribution rubber bearings have essential and revolutionary advantages in structural design, mechanical performance and engineering applicability. In terms of displacement adaptability, ordinary rubber bearings have extremely limited shear deformation capacity and can only meet the displacement demands of small-span straight bridges, failing to adapt to large and complex longitudinal and transverse displacement of long-span continuous beams, curved beams and urban viaducts caused by temperature changes and structural creep. In contrast, LNR bearings are optimized for shear performance with outstanding large displacement adaptability, fully meeting the design requirements of modern complex bridge projects. In terms of seismic and reset performance, traditional bearings have weak vibration isolation and energy dissipation capabilities, and are prone to irreversible residual deformation under seismic impact, leading to permanent structural offset. LNR bearings can effectively absorb and dissipate vibration and seismic energy to reduce the dynamic response of bridge structures and improve overall seismic grade, while achieving accurate zero-residual-deformation reset after load removal.

In terms of engineering practicality, LNR bearings feature simple installation, excellent aging resistance, fatigue resistance and corrosion resistance, requiring no frequent daily maintenance and effectively reducing the long-term operation and maintenance cost of bridge projects. While ordinary plate rubber bearings are only suitable for low-grade, small-span bridge projects with low horizontal load requirements, LNR horizontal force distribution rubber bearings are widely applicable to highway continuous beam bridges, urban viaducts, railway bridges, curved beam bridges, long-span bridges and seismic reinforcement projects of old bridges, perfectly adapting to engineering scenarios with high standards for structural stability, seismic performance and displacement adaptation.