Disipadores sísmicos de Fricción
Product Features
Beginning
Energy dissipators reduce deformations and stresses produced by the action of winds and earthquakes by increasing the damping of the structure by up to 50%. These devices, located at strategic points in the structures, allow reducing the structural response. Like basic seismic isolation systems, energy dissipation devices have been widely used worldwide in the design of new structures and in the reinforcement of existing structures. They are classified within passive seismic protection systems and are divided into:
- Hysterical heatsinks
- ADAS
- TADAS
- Honey Comb.
- Union of Braces
ADAS (Added Damping and Stiffness) devices
ADAS devices are made up of a set of plates with a tapered or X shape so that the creep is uniform in height. The number of steel plates is variable allowing the heatsink to be adjusted to the needs of the structure in which they are placed. The main advantage of the X-shaped plate is that when it is deformed, its deformation is transmitted evenly over the height of the plate. ADAS devices are generally used in frame structures, the plates are designed to dissipate energy by yield stress in bending. The ADAS system provides greater damping to the structure and reduces accelerations and seismic forces. The rigidity is increased and the period of vibration is reduced.
TADAS devices
TADAS heatsinks are made up of a set of triangular plates arranged to flex out of their plane. It is very similar to the ADAS system. The base of each plate is welded to another rigid plate, taken as an embedment condition, while the other end ensures free movement in the vertical direction.
With a relative displacement between the ends of the plate perpendicular to its plane, the plasticization by bending of simple curvature is obtained. This device gives horizontal resistance for any floor drift, through the flexural deformation of the individual plates. For mild earthquakes, the device is designed to work in the elastic range, while for severe earthquakes the plates have inelastic deformations dissipating a portion of the input energy. The number and dimensions of the plates are determined according to the demand of a particular application.
Profits
The effect of gravitational loads can be completely separated from the heatsink, using vertical perforations in the heatsink-counter-vent connection, then for large deformations the vertical displacements at that end are not restricted, so that only plasticity is produced by bending and the response Inelastic device is highly predictable.
Advantage
With the use of these devices, the structure is able to develop greater ductility and therefore reduce the devastating effect of a severe seismic event on the structural elements. The stresses, accelerations and deformations induced by an earthquake in a structure with seismic dissipation systems can be reduced from 15% to 50% compared to a structure without a seismic protection system, reducing damage to structural and non-structural elements. . These devices can receive a large number of cyclic loads and accumulate a large amount of plastic deformation without losing strength or rigidity.
Profits
- Reduction of damages by severe earthquakes.
- Reduction of costs for post-earthquake repair.
- Less damage to content.
- Increase in capital gains of the building.
- Perception of greater security by the user.
- Cost reduction of the structure.
Materials
Velatoph® uses the following materials to manufacture its hysteric heatsinks:
- Plates that make up the body of the devices: laminated carbon steel according to the ASTM A36 standard.
In some cases and upon request the following materials can be used:
- Neoprene-type synthetic elastomer according to ASTM D412. - Lead center with minimum purity of 99%
Connection system
ADAS and TADAS devices can be supplied already connected to the anti-venting system, which will avoid downtime on site. They can also be prepared for connection to the structure on site. Corrosion protection Velatoph® applies high quality corrosion protection to all its devices, so that they are not affected by the local environmental or terrain conditions where they will be used. Upon request, Velatoph® can provide corrosion protection systems according to international standards.
Inspection and Maintenance Velatoph® Hysteretic Seismic Dissipation Devices do not require preventive maintenance. The condition and position of the devices should be checked at regular intervals. Upon request, these inspections can be carried out by our technicians, reporting the results through a technical report.
Certification
Velatoph® is the first Mexican company to develop seismic protection systems, we are also the pioneers in developing a seismic protection system affordable for small buildings such as houses. We are also participating in the first Mexican Standard for seismic protection, providing the methodologies for calculating and designing prototypes, so that in the short term there may be regulations that allow builders and the general public to know in depth about the different methods that exist in the market to protect their assets and that of their clients.
Velatoph® currently manufactures its products in accordance with the specifications of the ASCE 7 Code, in terms of protection and dissipation of seismic energy.
essays
If the client requires it, Velatoph® can perform quality control tests of production at scale, Velatoph® has collaboration agreements with the main seismic research institutes in Mexico. Commonly performed tests are based on the AASHTO specification guide for seismic isolated design. At the customer's request, tests based on other codes can also be carried out.
