Abstract
The aim of the research here presented is to explore the robustness of base isolation achieved via Rubber-Layer Roller Bearing (RLRB) systems against seismic vibration. We consider an RLRB presenting nonlinear stiffness and nonmonotonic viscoelastic damping. Indeed, the cyclic contact between the metal cylinders and the rubber pads occurring in the RLRB leads to a bell-shaped damping response, with the damping force initially increasing with the relative velocity increasing up to a peak value, and then fast decreasing. Since real seismic excitation spectra are unknown, we focus on the effect of nonlinearity on the robustness of the response of the isolator under different inputs. Indeed, we perform a global optimization of the RLRB against three different earthquakes, together with a reference linear isolator for comparison; then, we compare the response of the structures equipped with the two isolation systems to each of the seismic shocks.
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Acknowledgments
This project has received funding from the European Union’s Horizon 2020 research and innovation programme under the Marie Sk lodowska-Curie grant agreement No 845756 (N.M. Individual Fellowship).
This work was partly supported by the Italian Ministry of Education, University and Research under the Programme “Progetti di Rilevante Interesse Nazionale (PRIN)”, Grant Protocol 2017948, Title: Foam Airless Spoked Tire – FASTire (G.C.).
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Menga, N., Bottiglione, F., Carbone, G. (2022). Nonlinear Viscoelastic Damping for Seismic Isolation. In: Lacarbonara, W., Balachandran, B., Leamy, M.J., Ma, J., Tenreiro Machado, J.A., Stepan, G. (eds) Advances in Nonlinear Dynamics. NODYCON Conference Proceedings Series. Springer, Cham. https://doi.org/10.1007/978-3-030-81166-2_18
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