Experimental assessment of sliding materials for seismic isolation systems |
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| Authors: | V Quaglini P Dubini C Poggi |
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| Institution: | (1) Department Mechanical Construction and Production, Ghent University, Sint-Pietersnieuwstraat 41, 9000 Gent, Belgium;(2) Department of Textiles, Ghent University, Technologiepark 907, 9052 Zwijnaarde, Belgium |
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| Abstract: | Novel self-lubricating materials are currently being proposed to be used in sliding isolation systems such as the curved surface
sliding isolator system, or pendulum bearing system, for the protection of buildings and structures. The current codes for
anti-seismic devices are focused on the evaluation of the performance of the whole isolation system; as a consequence, a reliable
procedure for the pre-assessment of the material combinations of sliding interfaces is currently missing. Therefore in this
paper, an experimental methodology is proposed for the characterization of self-lubricating materials through tests on small-scale
specimens performed using customized equipment able to reproduce the operational conditions of real isolation systems as per
contact pressure, sliding velocity, temperature and slide path. The testing sequence has been designed in order to evaluate
the sliding properties of the material in terms of static and dynamic coefficient of friction and wear resistance. Examples
are reported for the assessment of two self-lubricating materials with different sliding characteristics. In order to validate
the method and to confirm the reliability of extrapolating the results to real working conditions, prototypes of pendulum
isolation systems incorporating the assessed materials have been tested according to the AASHTO (Guide specifications for
seismic isolation design, 2nd edn. American Association of State Highway and Transportation Officials, Washington, DC, 1999) specifications and the relevant dynamic properties assessed from the Horizontal Load—Displacement loops. The experimental
outcomes confirmed that the frictional characteristics provided by the proposed procedure can be reliably used in the design
of seismically isolated structures. |
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