New SIP®-V-Bearings Protect Sensitive Laboratory

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BioSense Research Institute Novi Sad: Vibration isolation and seismic protection in one component

The BioSense Research and Development Institute was founded in Belgrade in 2015, and is part of the University of Novi Sad, where the new building has now been constructed. It is considered a pioneer in the field of digital and sustainable agriculture. Micro- and nanoelectronics, sensor design, and cellular agriculture are some of its scientific fields; the laboratory area located in the institute’s new building is accordingly sensitive.

The requirements for the BioSense research building for sustainable agriculture were clear: Inside, the new building has a small building core with a floor plan of 8 x 7 meters and four floors with a height of approximately 17 meters. This core accommodates complex and expensive laboratory instruments and microscopes. They must be protected against ground vibrations caused by traffic and earthquakes. The other parts of the institute building have normal requirements.

MAURER Sliding Isolation Pendulum with integrated vibration isolation SIP®-V

The building core now stands on four Sliding Isolation Pendulums with integrated vibration isolation (SIP®-V).

This new development combines both seismic and vibration protection in one component. To that end, two specialists collaborated and pooled their competencies: MAURER SE (Munich) and Getzner Werkstoffe GmbH (Austria). The lead planner was Dr. Marko Marinković of SDA-engineering. A bearing made of the dynamically highly effective material Sylodyn® (= vibration isolation) was embedded in the sliding lens (puck) of the classic Double Sliding Pendulum Bearing SIP®-D (= seismic protection).

Details on seismic protection

The basis for the SIP®-V is the Double Sliding Pendulum MAURER SIP®-D, which is used since 2004. It has two (“D” for double) concave main sliding surfaces and one sliding lens (puck) and is equipped with the sliding material MSM® (= MAURER Sliding Material).

SIP®-bearings have four functions in this project:

• They isolate the building from its foundations and allow horizontal movement of up to ±100 mm in all directions.
• They limit movements through internal friction by converting kinetic energy into heat. Specifically, a horizontal seismic acceleration of 0.2 g is at least halved.
• They re-center the building core in its initial position following an earthquake, as they have concave sliding surfaces.
• They transmit vertical loads of up to a maximum of 4,000 kN.

Details on vibration isolation

To protect the BioSense laboratory against daily micro-vibrations of the ground, such as those caused by traffic and noise, a Sylodyn®-bearing of Getzner was embedded in the sliding lenses (pucks) of the four SIP®-bearings.

Sylodyn® has been used to isolate structures worldwide for more than 25 years. The closed-cell elastomer prevents disturbing vibrations and secondary airborne sound. The Sylodyn® HRB HS types, in particular, provide high-performance vibration protection in the smallest space and were, therefore, optimally capable of being integrated into the Sliding Isolation Pendulum SIP®-V. The vibration isolation shields vibrations of at least 15 Hz.

The Double Sliding Isolation Pendulums SIP®-V measure 650 x 650 x 210 mm and have a service life of more than 50 years.

Dynamic earthquake and vibration tests

To guarantee the function of the new bearings, they were tested according to EN 15129 at EUCENTRE in Pavia, Italy. All vibration damping parameters, that is, natural frequency, effective damping, and load capacity, were proven.

Dampers protect against tilting

To prevent the slender structure of the building core from tilting, MAURER also installed four hydraulic dampers on the top floor in order to support the tilting moment.

The SIP®-V-bearings were installed in December 2021, and the dampers in March 2022. The new BioSense Institute became operational in April 2023.

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