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Paul Bonnet – Oxford University – paul.bonnet@eng.ox.ac.uk

Developing Real Time Substructure Dynamic Testing (RTS testing). Paul Bonnet – Oxford University – paul.bonnet@eng.ox.ac.uk. The problem: analyse the behaviour of a structure in an earthquake. Modelling cracks, fatigue, concrete, strain rate effects, etc . Scale effects and/or

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Paul Bonnet – Oxford University – paul.bonnet@eng.ox.ac.uk

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  1. Developing Real TimeSubstructure Dynamic Testing (RTS testing) Paul Bonnet – Oxford University – paul.bonnet@eng.ox.ac.uk

  2. The problem:analyse the behaviour of a structure in an earthquake Modelling cracks, fatigue, concrete, strain rate effects, etc. Scale effects and/or load capacity & cost Let’s do a computer model of the structure Let’s build a replica of the structure on a shaking table Let’s conduct a pseudo-dynamic test on the structure Let’s conduct a real-time substructure test All these methods have their inherent drawbacks No experimental velocity and inertial effects

  3. The idea behind RTS testing:divide structure into a part solved numerically and a part tested physically. 1 numerical substructure + 1 physical substructure + 1 emulation interface affect each other at all times separate but complementary have dynamic effects ensuring correct boundary conditions on each substructure For a RTS experiment to work, the 2 substructures and the interface emulation need to be solved / tested / conducted SIMULTANEOUSLY & in REAL-TIME.

  4. Example:behaviour of a dynamically isolated 10 storey building during an earthquake?

  5. Benefits of RTS testing: • Structural parts of interest => physically tested with the rest offering an infinite repeatability. • Complete structure is emulated with much lower cost & capacity than shaking table test. • Dynamic effects are exact because reproduced in real-time. => Practical & financial benefits while retaining good scientific validity.

  6. Results of preliminary tests:

  7. Results of preliminary tests:

  8. Challenges / current work: • Quick numerical substructure computation. => Using discrete time integration scheme (several schemes to compare). • “Instantaneous” actuation is not possible (presence of an “actuator delay” → instability). => Need to know how much delay, minimise it, know how & why it varies. => Need to compensate for actuation delay (several methods to compare). • Method needs to be applied & proven for non-linear numerical & physical substructures of earthquake engineering size & properties. => Conduct a validation test on a 2 storey building column.

  9. If you’d like to know more… …come and visit us in the Oxford University Structural Dynamics Laboratory paul.bonnet@eng.ox.ac.uk Tel: 01865 273 112

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