Where are high damping isolation rubber bearings mainly used for highway bridges
High damping isolation rubber bearings (HDR) for highway bridges are mainly used in high-intensity earthquake zones, cross fault zones, large-span and urban key bridges. The core is to provide integrated protection of isolation, energy dissipation and load-bearing between the beam and the pier.
High damping isolation rubber bearings (HDR) for highway bridges are mainly used in high-intensity earthquake zones, cross fault zones, large-span and urban key bridges. The core is to provide integrated protection of isolation, energy dissipation and load-bearing between the beam and the pier.
1、 Core application scenarios (by priority)
1. Bridges in high-intensity earthquake areas (most important)
Areas with seismic fortification intensity of 7 degrees or above (such as the southwest and northwest seismic active zones).
Directly installed between the bridge pier and the beam, it dissipates energy through large shear deformation during earthquakes, reducing structural response by 50% -70%.
Applicable bridge types: continuous beam, T-beam, small box beam, wide box beam, simply supported beam, etc.
2. Bridges crossing earthquake fault zones/geologically complex areas
Key highway bridges crossing active fault zones and geologically unstable areas.
Require the support to have strong damping, large displacement, and high restoring force to prevent beam drop and pier damage.
3. Large span and cross sea/river bridges
Large span beam bridges and cross sea bridges (such as the non navigable span bridge of the Hong Kong Zhuhai Macao Bridge).
Balancing earthquake resistance, wind resistance, and ship collision resistance, the single bearing capacity can reach thousands of tons.
4. Key bridges in the urban core area
Lifeline projects such as urban transportation hubs, cross river/river bridges, and elevated expressways.
Enhance seismic redundancy and ensure rapid recovery of traffic after the earthquake.
5. Special function bridges
Heavy duty transportation bridges, high-speed rail/public rail dual-use bridges, large interchanges, etc.
It is necessary to simultaneously meet the triple requirements of vertical load-bearing, horizontal displacement, and damping energy dissipation.
2、 Installation location and function
Installation: Bottom of beam body ↔ Between the tops of the piers and abutments.
Function:
Vertical: bear the weight of the beam and vehicle loads.
Level: Allowable temperature/contraction displacement, large deformation isolation+hysteresis energy dissipation during earthquakes.
Damping: Equivalent damping ratio of 10% -20%, no additional dampers required.
3、 Typical Engineering Cases
The Hong Kong Zhuhai Macao Bridge: A non navigable span bridge uses 3000 large HDR supports to withstand earthquakes of magnitude 8 and typhoons of magnitude 16.
Seismic design schemes for multiple high-intensity highways and high-speed railway bridges in China.
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