Seismic restraints shock transmitters C.M.M. LUST
C.M.M. shock transmitters devices LUST are double-acting hydraulic cylinders which, using only the viscous capacity of the oil, guarantee a rigid retention between the two connected structures acting only in the presence of impulsive (dynamic) actions.
The device is to be used when it is necessary to create a non-dissipative rigid connection between two different structures or two structural elements of the same construction (beam-pillar, pile-deck, etc.) that is activated only in the dynamic phase (opposite of the seismic forcing or wind load) and that in any case makes possible the slow movement of the service (irreversible displacements and thermal deformations).
All the components of the device (cylinder, stem, end pins, anchoring to the external structures) are therefore sized on a case-by-case basis according to the maximum axial force to which the device must withstand and the maximum displacement it must guarantee against slow actions.
Each end of the device is anchored to the external structure by means of a pin inserted in an anchoring ring provided with a spherical joint, which guarantees the device the ability to rotate around each axis.
The typical force-displacement behaviour is very simple, since the device is designed to be a rigid retainer (for high load speeds) and not to provide dissipation.
You can therefore have two typical behaviours, based on load speed limit values:
All the components of the device (cylinder, stem, end pins, anchoring to the external structures) are therefore sized on a case-by-case basis according to the maximum axial force to which the device must withstand and the maximum displacement it must guarantee against slow actions.
Each end of the device is anchored to the external structure by means of a pin inserted in an anchoring ring provided with a spherical joint, which guarantees the device the ability to rotate around each axis.
The typical force-displacement behaviour is very simple, since the device is designed to be a rigid retainer (for high load speeds) and not to provide dissipation.
You can therefore have two typical behaviours, based on load speed limit values:
Low load speed (e.g .: thermal actions)
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High loading speed (e.g .: seismic actions)
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