Anti-overturning Elastomeric Seismic Isolation Bearings
I. Core Definition
Anti-overturning elastomeric seismic isolation bearings are critical safety anti-seismic devices, engineered to satisfy tensile load demands of supertall isolated buildings subjected to seismic excitations and other lateral actions as specified in Eurocode 8 (EN 1998) and EN 15129.
The design and deployment of such bearings primarily mitigate overturning risks of structures under severe seismic loads and external horizontal actions. these devices deliver tensile resistance to enhance overall structural stability. Tensile restraint assemblies adopt diversified working principles and configurations, yet all share the core objective of elevating structural seismic safety and stability per EN 15129 performance criteria.
This integrated bearing system provides simultaneous tensile restraint and rotational capacity, delivers horizontal stiffness during lateral sliding displacement, and supplies vertical compressive stiffness under permanent vertical loads.
II. Anti-uplift Assembly (Mechanical Hook Type)
The bearing's Anti-uplift component adopts a mechanical interlocking hook configuration. Hook interfaces maintain tight contact to rapidly respond to uplift resistance requirements of the isolation layer; the assembly features a compact, straightforward layout with well-defined mechanical mechanisms. Its uplift resistance capacity can be customized to project-specific design loads, accompanied by a high safety factor conforming to EN 15129 load combination rules.
Sliding contact surfaces adopt PTFE sliding sheets paired with mirror-finished stainless steel plates, with no grease lubricant required. Friction coefficients are fully adjustable:
High-friction contact interface: friction coefficient ≤ 0.05;
Low-friction contact interface: friction coefficient range： 0.015 ~ 0.035;
III. Spherical Rotation Assembly
The rotational mechanism adopts a spherical articulation design to enable universal multi-directional rotation of the isolator. It accommodates irregular differential movements of the superstructure and substructure, eliminating jamming and rigid locking during horizontal design displacements (per EN 1998 design displacement provisions). Identical PTFE-on-mirror stainless steel sliding interfaces are implemented for rotational contact surfaces.
IV. Horizontal Seismic Damping Devices
Three types of horizontal damping assemblies are applicable: Spring damping devices, Elastomeric damping devices, and Viscous fluid dampers (VFDs, defined in EN 15129).
Horizontal dampers improve seismic energy dissipation of isolated structures and significantly boost the performance and efficiency of the entire isolation system in line with Eurocode 8 seismic isolation design requirements. Such damping assemblies regulate dynamic horizontal displacements of the isolation layer, thereby reducing seismic force and absolute acceleration imposed upon the isolated superstructure.
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