Presentation Title

Friction Model for Double Pendulum Isolators

Start Date

November 2016

End Date

November 2016

Location

HUB 265

Type of Presentation

Oral Talk

Abstract

Seismic isolation is an innovative technology that is increasingly used in order to reduce damages of structures due to major ground shaking events. Enhanced seismic protection is obtained by incorporating seismic isolators underneath a structure, aimed at reducing the transmission of the vibration energy generated by the ground shaking. Of the numerous seismic isolators currently available, friction-based devices are increasingly common and popular and continuously updated with new materials and designs. As more friction isolators are used and tested, new experimental evidence is available and needs to be incorporated into predictive models for seismic analysis of structures. Heating generated at the sliding interface have been latterly recognized as a main source of friction degradation that can severely affect the performance of such isolators during seismic events. An experimental model was recently developed and tested for single pendulum isolators to account for friction degradation due to heating. In this research, I extend this model to double pendulum isolators based on data from an extensive testing program. Results show that the model accurately applies to double pendulum isolators and properly describes the variation of the coefficient of friction under a variety of testing conditions. By utilizing this model, double pendulum isolators can be more precisely analyzed and designed for seismic isolation.

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Nov 12th, 11:45 AM Nov 12th, 12:00 PM

Friction Model for Double Pendulum Isolators

HUB 265

Seismic isolation is an innovative technology that is increasingly used in order to reduce damages of structures due to major ground shaking events. Enhanced seismic protection is obtained by incorporating seismic isolators underneath a structure, aimed at reducing the transmission of the vibration energy generated by the ground shaking. Of the numerous seismic isolators currently available, friction-based devices are increasingly common and popular and continuously updated with new materials and designs. As more friction isolators are used and tested, new experimental evidence is available and needs to be incorporated into predictive models for seismic analysis of structures. Heating generated at the sliding interface have been latterly recognized as a main source of friction degradation that can severely affect the performance of such isolators during seismic events. An experimental model was recently developed and tested for single pendulum isolators to account for friction degradation due to heating. In this research, I extend this model to double pendulum isolators based on data from an extensive testing program. Results show that the model accurately applies to double pendulum isolators and properly describes the variation of the coefficient of friction under a variety of testing conditions. By utilizing this model, double pendulum isolators can be more precisely analyzed and designed for seismic isolation.