Dampers

MAURER dampers convert kinetic energy into thermal energy. This process is called dissipation. The dampers continuously and specifically reduce the energy passed into the structure by seismic impacts and thus prevent damages due to horizontal transgression of acceleration and movement. To this end, the damping property of different materials and liquids is used. Deformation- and speed-depending as well as adaptive systems are at choice.

Hydraulic Dampers: MHD

MAURER Hydraulic Dampers can complement seismic devices by isolators to achieve an even better system behavior as regards less forces and displacements for seismic load cases as well as the operational load case. MAURER Hydraulic Dampers dissipate energy by making use of the viscous behavior of liquids; they differ from commonly used linear viscous dampers by a reaction force at fast movements that is almost independent of velocity. This ensures optimal damping and avoids exceeded design limits. In case of an earthquake, an intelligent fluid flow system allows for relative movements and keeps the response force at a constant level.

Key characteristics of MAURER Hydraulic Dampers:

  • No leaking effects due to the triple-seal-guide system avoiding wearing or fatigue.
  • Protection of device and structure by effective force limiter function with a special valve system.
  • Less displacements and forces within the system with damping indices exponents of 0.04 to 1.0
  • Immediate lock-up after min. 1-3 mm displacement for service forces resulting from high rigidity due to low compressibility of the hydraulic oil.
  • Optimum performance in any climate zone. Functional characteristics virtually independent of the temperature within -40°C to +40°C.
  • Optimized design with CE-marking which is absolutely completely maintenance-free.
  • No long term leaking in its resting state as the MHD is not pre-stressed and is not under any significant pressure.
  • MAURER can provide semi-active dampers especially adapted to the needs of stay cables and tuned mass dampers.

Semi-active Dampers

MAURER Semi-active Dampers are equipped with a magneto-rheological fluid, the viscosity of which can be controlled via an electronically modifiable magnetic field. Thus, the damping behavior can be continuously changed in accordance with individually determined algorithms with shortest reaction times and lowest energy consumption. In this way, deformations and bearing forces can be optimized.

Steel Hysteresis Dampers: MSHD

Plastic deformation of steel is one of the most effective mechanisms for energy dissipation, both from an economical and a technical point of view. In the 1970s, the idea was born to use steel-hysteresis dampers in structures to dissipate large parts of the seismic energy. Dissipators made of steel were designed and produced in many variants. Their strong points: high reliability, functionality independent of temperature and applied speed, high aging resistance, no maintenance required, and limited costs. Yet their severe disadvantage is their limited ability to take large displacements under consideration, like it is required in structures, particularly bridge structures that are built in regions with high seismic activity. MAURER responded to this challenge by developing and experimentally testing two types of steel-hysteresis dampers. The energy dissipation is achieved by subjecting the hysteresis elements to two different applied movements, axial movement and torsion.

Compact Steel Dampers: MCSD

The patented MAURER Compact Steel Damper is operating in one direction (tension and pressure) with resilience capability. The advantage versus customary „buckling restrained braces“ is the more compact design by factor three in longitudinal direction.

Key characteristics of MCSD

  • Very compact design
  • Reliability
  • Elastic displacement capability up to +/-50 mm
  • Plastic displacement capability of +/- 300 mm
  • Service life 100 years plus
  • High aging resistance and wear-free
  • High stiffness under operating load
  • Resistance against up to three design earthquakes
  • Cost-efficient

Steel dampers horizontally operating in two directions and re-centering: MRSD

MRSDs are used in bridge and building construction and can be combined with customary sliding bearings for load transmission. The comparably high energy dissipation is achieved by steel elements of a special geometry that undergo plastic deformation depending on the displacement value. They generate the necessary re-centering of the building at corresponding deformation. Extremely high forces (2,000 kN and more) can be realized in case of very large displacements up to +/-1.5 m and more. Due to the changing stiffness depending on the displacement amplitude and the strong increase of force at the end of the movement capacity, structural displacements are reduced by up to 30% compared to customary hysteresis dampers, hydraulic dampers or sliding isolation pendulum bearings. Thus, the dampers are outstandingly suited as re-centering dissipators in seismic isolations of buildings/bridges as well as in diagonal braces of buildings.


MARTI: Adaptive Re-Centring Torsion Isolator

MARTI (MAURER Adaptive Re-Centering Torsion Isolator) is a combination of a sliding surface isolator and a hysteresis damper. The sliding surface isolator manages vertical load transmission, horizontal flexibility and low damping through friction. The hysteresis damper complements the functionality of MARTI by providing further damping and re-centering. The hysteresis damper is identical with the MRSD.