Seismic Zone Pipe Truss Isolation Bearing Selection

When selecting isolation bearings for pipe trusses in seismic zones, laminated rubber bearings should be prioritized due to their horizontal deformation capacity, which can effectively absorb seismic energy and reduce structural acceleration response. For large-span pipe trusses, lead rubber bearings are recommended to balance wind resistance and seismic isolation requirements. The bearing arrangement should ensure matching with the truss node stiffness to avoid localized stress concentration.

During selection, it is necessary to check the tensile stress under rare earthquakes, which should not exceed 0.5MPa in soft soil areas such as Shanghai. The bottom surfaces of the bearings should preferably be kept at the same elevation to simplify construction and ensure the collaborative work of the isolation layer. If necessary, wind-resistant devices should be added to supplement stability during minor earthquakes.