Seismic isolation of bridges using isolation systems based on flat sliding bearings |
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| Authors: | Mauro Dolce Donatello Cardone Giuseppe Palermo |
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| Institution: | (1) DiSGG, University of Basilicata, Macchia Romana Campus, Potenza, 85100, Italy |
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| Abstract: | Three different isolation systems (IS’s) for bridges and viaducts are considered in the present study. All of them are made
of steel-PTFE sliding bearings (SB) to support the weight of the deck and auxiliary devices, based on different technologies
and materials (i.e. rubber, steel and shape memory alloys), to provide re-centring and/or additional energy dissipating capability.
An extensive numerical investigation has been carried out in order to (i) assess the reliability of different design approaches,
(ii) compare the response of different types of IS’s, (iii) evaluate the sensitivity of the structural response to friction
variability due to bearing pressure, air temperature and state of lubrication and (iv) identify the response variations caused
by changes in the ground motion, bridge and isolation characteristics. The nonlinear time-history analyses have been carried
out using a simplified pier-deck model, where the pier is modelled as an elastic cantilever beam and the mass of the deck
is connected to the pier through suitable nonlinear elements, simulating the behaviour of the IS. Both artificial and natural
seismic excitations have been used in the nonlinear dynamic analyses. |
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| Keywords: | Bridges Sliding bearings Seismic isolation systems Performance-based design Shape memory alloys |
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