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2004, 18

Federico Bartolozzi

Natural frequency automatic variation in seismic isolation system

language: English

received 27.10.2004, published 23.11.2004

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The proposed system is based on the following operations: 1. interruption of the continuity between the building and the foundation-soil complex; 2. self-centring of the building after an earthquake. By means of its own elastic deformation each bearing can automatically compensate the rigid deflection variation relative to support due to the horizontal component of the motion. The building remains motionless with respect to the foundation-soil complex, which moves. The vertical motion, due to the sub-undulatory shock, varies the building behaviour only partially. It remains stationary with respect to the horizontal translation, but it is subject to a low vertical translation and to a resonance possibility. In order to prevent the resonance danger, the vertical natural frequency variability takes place because of auxiliary springs which automatically increase the action of one or more main springs during an emergency, characterised by an interval of vertical seismic frequencies including the resonance one.

16 pages, 8 figures

Сitation: Federico Bartolozzi. Natural frequency automatic variation in seismic isolation system. Electronic Journal “Technical Acoustics”,, 2004, 18.


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Federico Bartolozzi was born in Agrigento, Sicily (Italy) and lives in Varese (Italy). He taught Building Technology and practised Civil Engineering, working out architectonic and structural plans. Now, he devotes all his time to study of Base Earthquake Isolation Systems, Soil Mechanics and Structural Engineering. He is titular of three national patents (Building system in seismic areas; Rigid connection with alternative function of elastic linkage; Fixed bearing with alternative function of multidirectional movable bearing) and author of three publications. As independent researcher, he already participated in numerous International Conferences, where his studies were accepted for oral or poster presentation and published in Conference proceedings

Postal address: via dei Carracci, 4, 21100 Varese, Italy
Phone & Fax: + 39 0332 234290
e-mail: ciuciuzza(at)