Our High Damping Rubber Bearings (HDRB) provide reliable seismic protection for bridges and buildings. Laminated high-damping rubber with steel shims transforms earthquake vibrations into slow, controlled movements, reducing structural damage. HDRBs combine strong vertical support, horizontal flexibility, and self-centering ability for long-term stability.
High Damping Rubber Bearings (HDRB), also commonly referred to as HDR seismic isolation bearings or HDR bearing pads, are a cornerstone of modern seismic protection technology for bridges and buildings. Their widespread global adoption in regions of high seismicity, supported by decades of proven performance in real earthquakes, positions them as a premier choice for engineers designing resilient infrastructure. This reputation stems from their exceptional ability to drastically reduce earthquake damage. Essentially, an HDR bearing is a type of base isolator composed of specially formulated rubber with intrinsically high damping properties, meticulously laminated and vulcanized between multiple layers of steel plates (shims).
This unique construction is the key to its success: it provides immense vertical stiffness to solidly support the structure's weight while offering the horizontal flexibility needed to translate destructive earthquake vibrations into a gentle, slow rocking motion. The high damping rubber itself is engineered to absorb and dissipate a significant amount of seismic energy as heat, a crucial function that significantly reduces the forces transferred to the substructure. Furthermore, HDR bearings possess an excellent self-centering ability, ensuring the structure returns to its original position after the seismic event.
The combination of all-in-one functionality, long-term reliability, and minimal maintenance requirements—thanks to the fact that internal steel plates are fully sealed within the resilient rubber for corrosion protection—makes HDR bearings a highly preferred and trusted solution. For installation, they are typically supplied with top and bottom steel connection plates and anchor plates for secure attachment and easier future maintenance. Similar in concept to Lead Rubber Bearings but utilizing a purely elastomeric damping mechanism, High Damping Rubber Bearings stand as a robust, validated, and globally recognized technology for safeguarding critical structures against earthquakes.
High Damping Rubber Bearings (HDRBs) achieve their exceptional seismic performance through a specially formulated rubber compound that inherently provides a high damping ratio, typically between 15% and 18%. The working principle is intelligent and efficient: the bearing's stiffness is dependent on the deformation level. Under minor loads or service conditions, it remains stiff to ensure stability. During a major earthquake, however, it undergoes large horizontal deformations, becoming significantly softer to lengthen the structure's natural period and isolate it from the damaging shock waves. Simultaneously, the high-damping rubber efficiently absorbs and dissipates seismic energy as heat.
This unique mechanism delivers several key features and benefits. HDRBs offer high vertical load capacity alongside excellent horizontal flexibility and outstanding self-centering (recovery) ability. Their full hysteretic behavior ensures effective isolation protection across a wide range of seismic events, from minor to major. As a self-contained unit that requires no additional damping devices, they significantly reduce long-term maintenance and repair costs. Furthermore, these bearings are renowned for their reliability, exhibiting minimal sensitivity to temperature variations, excellent creep resistance due to advanced rubber formulations, and superior anti-aging properties. A protective EPDM cover often shields the internal rubber from ozone and ultraviolet radiation, ensuring long-term durability. These combined principles and features make High Damping Rubber Bearings a robust and versatile solution for modern seismic isolation needs.
Working temperature range: -40 °C to +60 °C.
Rad: 0.006 rad and 0.008 rad.
Damping ratio:
HDR (Ⅰ) bearing rubber: 15%.
HDR (Ⅱ) bearing rubber: 12%.
LNR bearing rubber: 10%.
· HDR (Ⅰ) bearing rubber – Rectangular Fixed
· HDR (Ⅰ) bearing rubber – Round Fixed
· HDR (Ⅱ) bearing rubber – Rectangular Fixed
· HDR (Ⅱ) bearing rubber – Round Fixed
· LNR Rubber Bearing – Rectangular Sliding
· LNR Rubber Bearing – Round Sliding
Characteristics | Requirements | |||
G Modulus (MPa) | 0.7 | 0.9a | 1.15 | |
Tensile strength (MPa) | Moulded Test Piece | ≥16 | ≥16 | ≥16 |
Test Piece From Bearing | ≥14 | ≥14 | ≥14 | |
Minimum Elongation at Break (%) | Moulded Test Piece | 450 | 425 | 300 |
Test Piece from Bearing | 400 | 375 | 250 | |
Minimum Tear Resistance (kN/m) | CR | ≥7 | ≥10 | ≥12 |
NR | ≥5 | ≥8 | ≥10 | |
Compression Set (%) | CR 24 h, 70 °C | ≤15 | ||
NR 24 h, 70 °C | ≤30 | |||
Accelerated Ageing (Maximum change from unaged value) | ||||
Hardness (IRHD) | NR 7d, 70 °C | -5+10 | ||
CR 3d, 100 °C | ±5 | |||
Tensile strength (%) | NR 7d, 70 °C | ±15 | ||
CR 3d, 100 °C | ±15 | |||
Elongation at break (%) | NR 7d, 70 °C | ±25 | ||
CR 3d, 100 °C | ±25 | |||
Ozone Resistance | Elongation: 30%, 96 h | No cracks | ||
40±2 °C | ||||
NR 25 pphm | ||||
CR 100 pphm | ||||
Excellent horizontal displacement. absorb shock energy effecively.
Excellent reset structure. there is no residual displacement.
High damping material. 10% to 18% damping capacity for shock absorption.
Wide range structure for different environments and displacement requirements.
Economical and high performance for lower total construction budget.
Easy installation and replacement for lower maintenance cost.
Damping structure
Fixed type (HDR rubber bearing). The high damping rubber has excellent horizontal shear performance to bear the horizontal force. It can absorb vibration through large displacement in horizontal direction and hysteretic energy.
Rectangular HDR rubber bearing.
Round HDR rubber bearing.
Sliding type (LNR rubber bearing). The displacement is achieved by sliding friction. The top stainless steel plate and PTFE sliding plate can reduce friction coefficient and achieve large displacement for shock absorption.
Rectangular LNR rubber bearing.
Round LNR rubber bearing.
Fixed type
1-top anchor plate ; 2-top steel plate; 3-top connection plate; 4-screw; 5-elastomer; 6-reinforced steel plate; 7-sleeve; 8-anchor bolt; 9-rubber cover; 10-bottom connection plate; 11-bottom steel plate; 12-bottom anchor plate.
Free type
1-anchor bar; 2-top anchor plate ; 3-top steel plate; 4-stainless steel plate; 5-PTFE or UHMWPE; 6-bottom steel plate; 7-rubber cover; 8-reinforced steel plate; 9-elastomer.
elastomer
The elastomeric used in the manufacturing of lead rubber bearing should be specified in the project documentation as either natural rubber (NR) or chloroprene rubber (CR) as the raw polymer.
Physical and mechanical propertied of elastomer
Characteristics | Requirements | Test Methods | |||
G Modulus (MPa) | 0.7 | 0.9a | 1.15 | ISO | Equivalent national standard |
Tensile Strength (MPa) Molded Test Piece Test Piece from Bearing Minimum elongation at break(%) Molded Test Piece Test Piece from Bearing |
≥16 ≥14
450 400 |
≥16 ≥14
425 375 |
≥16 ≥14
300 250 | ISO 37 type2 | GB/T 528-1998(Type 2) |
Minimum Tear Resistance(KN/m) CR NR |
≥7 ≥5 |
≥10 ≥8 |
≥12 ≥10 | ISO 34-1 Trouser （Method A） | GB/T 529-1999 （Pants type） |
Compression Set(%) 24h; 72℃ |
CR ≤15 NR≤30 | ISO 815 φ29×12.5mm, Spacer: 9.38mm,-25% | GB/T 7759-1996 | ||
Accelerated Ageing (Maximum change from unaged value) -Hardness(IRHD) NR 7 d , 70℃ CR 3 d, 100℃ -Tensile strength(%) NR 7 d , 70℃ CR 3 d, 100℃ -Elongation at break(%) NR 7d , 70℃ CR 3d, 100℃ |
-5+10 ±5
±15 ±15
±25 ±25 | ISO 48 ISO 188 | GB/T 6031-1998 GB/T 3512-2001 | ||
Ozone Resistance Elongation: 30% – 96h 40℃±2℃ NR 25pphm CR 100pphm | No cracks | ISO 1431-1 | GB/T 7762-2003 | ||
Steel plates
Reinforcing plates, the top and bottom steel plates, connection plates are made from rolled carbon steel conforming to EN10025, EN10083, and EN10088/SHTOA36 or A570.
Anchor system
Equipped with anchor plates to facilitate the connection to the lower and upper concrete structures. Alternatively, the bearing can be prepare for connection to steel structures.
Applicable standards
· European Standard: EN 15129;
· American Standard: AASHTO;
· Other standards, according to customized requirement.
Production & Quality Control
We have advanced equipment for producing high damping rubber bearing.
The high damping rubbers and steel plates will be vulcanized in professional equipment.
Then the laminated bearing pads will be connected with top and bottom steel plate through anchor bolts.
Then the steel plate will be painted into different colors. The popular color is orange, blue and yellow. Other colors can be customized.
High damping bearing rubber will be packed with plastic films to protect bearing rubbers from moisture, dust and impact.
The proven effectiveness of High Damping Rubber Bearings has led to their widespread adoption in seismic isolation projects globally. They are a preferred solution for protecting critical infrastructure, with prominent applications in two key areas:
Bridge Engineering: HDRBs are installed between the bridge deck and its supporting piers, effectively isolating the structure. This prevents catastrophic damage and ensures that vital transportation routes remain functional for emergency response and recovery efforts after a major earthquake.
Building Construction: Their use is critical in base-isolated buildings, especially for essential facilities that must remain operational, such as hospitals, fire stations, data centers, and schools. They are also increasingly specified for commercial and residential high-rises, museums housing priceless artifacts, and industrial plants where minimizing downtime is crucial.
Laminated Elastomeric Bearings, also known as steel reinforced elastomeric bearing pads, are fundamental structural elements engineered to support and protect bridges and other structures. These high-performance bearings are manufactured through a process of vulcanization, which bonds alternating layers of high-quality elastomer (such as natural rubber) and internal steel plates (shims) into a single, integral unit. This robust construction combines high vertical stiffness with beneficial horizontal flexibility, making them a superior and versatile solution for a wide range of applications.
A Lead Rubber Bearing (LRB), also known as a lead-core rubber bearing, is a premium base isolation device engineered to protect bridges and buildings from earthquakes. Its robust construction features a central, cylindrical lead core press-fitted within a laminated stack of elastomeric rubber layers and reinforcing steel plates, all vulcanized into a single, high-performance unit. The lead core delivers exceptional energy dissipation through hysteretic damping, achieving an equivalent viscous damping ratio of up to 30%, while the rubber and steel layers provide flexible support, lengthening the structure's natural period to reduce seismic force impact. This synergy offers superior vertical load capacity, horizontal flexibility, and outstanding corrosion resistance. Available in round and rectangular shapes with single or multiple lead core options, our LRBs are custom-engineered to meet specific project demands for ultimate resilience and safety.
Pot bearings are critical load-bearing and shock-absorption devices widely used in highway bridges, railway bridges, municipal viaducts, and large-scale building structures. They transfer the load from the superstructure by confining an elastomeric pad within a steel pot, while utilizing the low-friction characteristics of PTFE (Polytetrafluoroethylene) plates sliding against stainless steel surfaces to accommodate smooth translational movements. Renowned for their high load capacity, significant horizontal displacement capability, and flexible rotation, pot bearings are indispensable key components in modern long-span bridge engineering.
We supplies premium spherical bridge bearings designed for large loads & rotations. Compliant with EN 1337-7 & AASHTO. Ideal for bridges & complex structures.
Modern structures, from monumental bridges to complex buildings, are designed to be flexible. They must safely accommodate movements and rotations caused by thermal expansion, traffic loads, and wind. Spherical Bearings are engineered to support these structures while safely transferring loads and allowing for controlled movement, ensuring long-term structural integrity and safety.
Westcoast New Area, Qingdao City ,Shandong Province ,China
