Abstract
The present study investigates the capability of different hysteresis models in representing the nonlinear behaviour of Recycled Rubber-Fibre Reinforced Bearings (RR-FRBs). A recently developed class of uniaxial phenomenological models is considered along with the Bouc-Wen Model (BWM). In particular, Bilinear Model (BM) and Exponential Model (EM), belonging to the class of above-mentioned phenomenological models, are used. The restoring force-displacement loops of RR-FRBs obtained from the different models are compared with the experimental studies retrieved from the literature. These first results show that the EM not only can accurately predict the behaviour of RR-FRBs, but it also requires a significantly lower computational time. Furthermore, to investigate the capability of the models in predicting the complete response of base-isolated structures, nonlinear time history analyses are carried out on a base-isolated rigid block with RR-FRBs. The response time histories of the rigid block and the restoring force-displacement loops obtained by using the EM are found to be in close agreement with the results obtained by adopting the BWM. In addition, the EM computational time is only 0.25 % of BWM. This clearly demonstrates the efficiency of EM in the seismic response analyses of base-isolated structures with RR-FRBs.
Highlights
Base isolation is one of the most innovative technologies that allows for a better control of the seismic response of structures by introducing isolation bearings between the superstructure and its foundation [1, 2]
Fibre-Reinforced Bearings (FRBs), which are manufactured by bonding rubber layers with thin layers of fibre reinforcement, are one such promising low-cost technologies typically employed in base isolation systems [6, 7]
The present study aims at investigating the applicability of different hysteresis models in simulating the behaviour of Rubber-Fibre Reinforced Bearings (RR-FRBs)
Summary
Base isolation is one of the most innovative technologies that allows for a better control of the seismic response of structures by introducing isolation bearings between the superstructure and its foundation [1, 2]. In order to address these specific issues, a recently developed class of uniaxial phenomenological models is considered in the present study Such a family, formulated by Vaiana et al, is found to be advantageous when compared to other models due to its reduced computational effort. A comparative study of these different type of phenomenological models with specific application to the special type of innovative passive control device such as RR-FRB is not available in the literature In this context, the present study aims at investigating the applicability of different hysteresis models in simulating the behaviour of RR-FRBs. In comparison with conventional FRBs, RR-FRBs demonstrated stronger nonlinearity due to porous media of the recycled compound.
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