Accurate FPB Selection: Three Core Key Points
1. Selection by Load and Displacement
Determine the bearing capacity grade, spherical curvature radius and ultimate displacement of FPB according to the vertical load and horizontal seismic displacement of the superstructure.For heavy-load structures, priority shall be given to large-tonnage double-curved FPB; for large displacement scenarios, multi-stage friction pendulum FPB shall be adopted to adapt to working conditions of different earthquake magnitudes.
2. Selection by Site and Working Condition
In areas of high seismic intensity and soft soil foundation, high-damping and large-displacement FPB is preferred.In severe cold and corrosive environments, materials such as stainless steel and low-temperature resistant seals shall be adopted for corrosion and cold resistance.In areas with large wind loads, the friction coefficient shall be optimized to balance wind resistance stability and seismic isolation effect.
3. Selection by Structure Type
For bridge engineering, longitudinal and transverse anisotropic FPB is selected to adapt to beam expansion and contraction.For building engineering, bidirectional isotropic FPB is adopted to resist earthquakes in any direction.For reinforcement of existing buildings, thin and lightweight FPB is selected to reduce renovation difficulty.