Seismic brake

E - Fixed Constructions – 04 – H

Patent

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Details

E04H 9/02 (2006.01) F16L 3/10 (2006.01)

Patent

CA 2186026

A seismic brake assembly (100) comprises an annular pipe (1) journaled through a gripping block (2) which frictionally engages the pipe (1) about the pipe's outer diameter. The force with which the gripping block (2) frictionally engages the pipe (1) is controlled by a Belleville or spring-loaded washer (9). By securing the gripping block (2) to one point in a structure (11) and securing one end of the pipe (1) to another point in or associated with the same building or structure (11) to be supported, the seismic brake (100) functions as a rigid member of applied lateral stresses less than a design threshold. When the applied lateral forces exceed the design threshold, controlled sliding friction between the pipe (1) and gripping block (2) is experienced, whereupon the building or structural framing returns the seismic brake (100) to its normal position when the seismic activity ceases. By controlling various factors including the diameter of the pipe (1) and the tension with which the gripping block (2) engages the pipe (1), virtually any desired hysteresis loop may be achieved.

Ensemble frein sismique (100) comportant un tube annulaire (1) monté en porte à faux sur un bloc de serrage qui enserre par la surface extérieure du tube (1). La force de frottement exercée par le bloc (2) sur le tube (1) est fournie par une rondelle de type Belleville ou chargée par ressort. En fixant le bloc (2) en un point d'une structure (11) et une extrémité du tube (1) en un autre point à l'intérieur de ou associé à la structure ou au bâtiment, le frein sismique (100) se comporte comme un élément rigide tant que les forces latérales appliquées ne dépassent pas un seuil donné. Lorsque les forces latérales appliquées dépassent ledit seuil, il se produit un frottement d'intensité contrôlée entre le tube (1) et le bloc (2), après quoi le bâtiment ou la structure ramène le frein (100) à sa position de repos, lorsque l'activité sismique a cessé. En faisant varier différents facteurs tels que le diamètre du tube (1) et la tension du bloc (2) sur le tube (1), on peut pratiquement réaliser tout type de cycle hystérésis.

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