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Bridge isolation with high-damping rubber bearings - analytical modelling and system response

Grant, DN; Fenves, GL; Auricchio, F; (2004) Bridge isolation with high-damping rubber bearings - analytical modelling and system response. In: : Vancouver, Canada.

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Abstract

High-damping rubber (HDR) bearings are used in seismic isolation applications for buildings and bridges, although no models are currently available for the accurate description of the shear force–deformation response under bidirectional loading. A strain rate-independent, phenomenological model is presented which effectively represents the stiffness and damping of HDR bearings for a range of shear strains. The model decomposes the resisting force vector as the sum of an elastic component, obtained from a generalised Mooney–Rivlin strain energy function, and a hysteretic force, described by an approach similar to bounding surface plasticity. The proposed model is used in a series of parametric studies of isolated bridge systems with ground motion of varying intensity. It is found that, while the HDR bearing system is effective at design levels of earthquake intensity, at higher levels of ground motion, significant inelastic demand may be experienced in bridge piers. Capacity design philosophy, which requires a ductile failure mechanism for any level of earthquake intensity, implies that ductility must be provided in the piers, and the interaction between pier yielding and bearing response must be understood.

Type: Proceedings paper
Title: Bridge isolation with high-damping rubber bearings - analytical modelling and system response
Additional information: keywords: Bridges, By me, Isolators, Material modelling
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Civil, Environ and Geomatic Eng
URI: http://discovery.ucl.ac.uk/id/eprint/1304801
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