Experimental testing of a re-centring viscous damper with non-Newtonian damping fluid (2019)
AuthorsGolzar F, Chase, J.G., Rodgers Gshow all
Hybrid damping devices combining different energy dissipation mechanisms can provide an overall response which can perform across a large range of near-fault and far-fault earthquakes with different frequency and velocity characteristics. Prior research has investigated the combination of ring-springs and viscous fluid dampers to create an overall re-centring viscous fluid damper, but only with linear force-velocity response in the viscous damper component. Non-linear force-velocity behaviour from the use of Non-Newtonian damping fluid has several advantages over linear viscous dampers that use a standard Newtonian fluid. In most structural applications, the likely damper input velocity is relatively unknown due to uncertainty in the input ground acceleration that may be experienced at a given site. This research experimentally investigates a hybrid damper that uses re-centring ring springs with a viscous fluid damper with high viscosity silicone fluid to provide a non-linear force-velocity response. Proof-of-concept experimental testing with sinusoidal displacement inputs are undertaken on the hybrid device as well as its individual components. Input amplitudes of [20-30] mm over a range of frequencies [0.1-4] Hz are used to create input velocities [10-300] mm/s. At peak speed, maximum resistive device force is ~50kN where ~25kN comes from the ring spring and ~25kN from the viscous damper. A non-linear force-velocity characteristic is seen in the viscous damping component of the hybrid device, as a result of the Non-Newtonian characteristics of the silicone damping fluid. The individual components of the device are tested in addition to the hybrid device to delineate the contributions to response.
CitationGolzar F, Chase J, Rodgers G (2019). Experimental testing of a re-centring viscous damper with non-Newtonian damping fluid. Auckland, New Zealand: 11th Pacific Conference on Earthquake Engineering. 04/04/2019-06/04/2019.
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ANZSRC Fields of Research09 - Engineering::0905 - Civil Engineering::090504 - Earthquake Engineering
09 - Engineering::0905 - Civil Engineering::090502 - Construction Engineering