Tectonus RSFJ self-centering friction damper technology

A cost-effective alternative to base isolators, Tectonus RSFJ is our original patented technology, combining damping and self-centering all-in-one. Applied in braces, cross-braces, and in rocking shear walls, RSFJ provides continuous protection through aftershocks, and limits residual drift to below 0.1%. In doing so, building owners and occupiers reduce the risk of injury and death, minimize post-quake damage, and experience less downtime than their peers in a significant seismic event.

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Patented Technology

When applied force overcomes the frictional resistance between the sloped surfaces, the center plates start to slide and energy is dissipated via friction during sliding cycles.

The shape of the plate ridges and use of disc springs and high-strength bolts, provides the self-centering behavior. The angle of the grooves is designed such that at the time of unloading, the reversing force induced by the elastically compacted disc springs is larger than the friction force acting between the facing surfaces. That way, the system is recentered upon unloading.

Flag-shaped Hysteresis

The Tectonus RSFJ’s compact and scalable configuration offers design freedom for any application.

The device is exceptionally scalable and can be implemented in all types of projects involving various materials and configurations. Any flag shape response can be achieved.

The device load deformation is geometrically non-linear and all parts remain within their material elastic range within the design earthquake.

The device provides 10 to 15% hysteretic damping depending on the range of deformation specified. All parts of the device are capacity designed.

Rigorously Tested

Thanks to our roots in academia, the RSFJ has been extensively tested over the years.

Shake Table Testing
Steel and timber brace system tests as per AISC 341 and ISO 13033
Timber and concrete wall system tests as per ISO 13033
Component tests as per ASCE 7-16
Durability and secondary fuse tests.

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Unique Design

The device consists of two outer plates and two center plates with elongated holes. The outer cap plates and the center plates are grooved and clamped together with high-strength bolts and disc springs.