in the construction of the Tomb of Cyrus the Great in Pasargadae, Iran. The earliest uses of base isolation systems date back all the way to 550 B.C. The bearing, which consists of layers of rubber and steel with a lead core, was invented by Dr Robinson in 1974. In order to realize even higher damping, Sliding Isolation Pendulums can be combined with additional horizontal dampers such as MAURER Hydraulic Dampers or MAURER Hysteresis Dampers. Base isolator bearings were pioneered in New Zealand by Dr Bill Robinson during the 1970s. In case of an earthquake, MAURER Sliding Isolation Pendulums are immediately activated without breaking effect, since the static friction is slightly higher than the dynamic friction. MAURER Sliding Isolation Pendulums are completely maintenance-free and have a service life of 100 years plus. Vertical loads of 250 MN and more can be transferred by a sliding isolation pendulum, equaling a mass of 25,000 t. By using the sliding material MSM® in lubricated and non-lubricated form, you may choose from a broad range of friction coefficients between 1% and 7%, and the requirements for a sliding bearing in use are met according to standards.īy varying the coefficients of friction, the pendulum radius, and the bearing movement, the Sliding Isolation Pendulums are conceptualized individually according to the specification. Energy is dissipated by the friction on the sliding surface. The re-centering function is ensured by the curved main sliding surface following the principle of a pendulum. MAURER Sliding Isolation Pendulums feature the outstanding properties of a spherical bearing. The High Damping Rubber features a larger contact surface between elastomer molecule and filler, which leads to higher damping rates of 10 to 20% and thus generates a considerably higher hysteresis. The shear modulus is between 0.6 and 1.2 N/mm 2 depending on the requirements.Įlastomeric isolators with high damping consist of an elastomer with high damping properties. The isolators transmit the vertical loads from the structure with rotations and elastic re-centering allowed at the same time, dependent on the height of the elastomer and its shear modulus. MAURER Elastomeric Bearings isolate the structure and the foundation in case of seismic loads.ĭepending on the requirements, elastomeric mixtures with low (MLDRB, MAURER Low Damping Rubber Bearing) and high damping (MHDRB, MAURER High Damping Rubber Bearing) are available.Įlastomeric isolators with low damping consist of several layers of a special elastomer placed on top of each other, which are connected through steel sheets. They distinguish by a good re-centering capability at horizontal displacement. MAURER Elastomeric Bearings are isolators and feature the properties of a conventional structural bearing.
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