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Hybrid Experimental Analysis of Semi-active Rocking Wall Systems

Hybrid Experimental Analysis of Semi-active Rocking Wall Systems. K.J. Mulligan , M. Fougere, J.B. Mander, J.G. Chase, G. Danton, R.B Elliott Departments of Mechanical and Civil Engineering, University of Canterbury, Christchurch B.L Deam

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Hybrid Experimental Analysis of Semi-active Rocking Wall Systems

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  1. Hybrid Experimental Analysis of Semi-active Rocking Wall Systems K.J. Mulligan, M. Fougere, J.B. Mander, J.G. Chase, G. Danton, R.B Elliott Departments of Mechanical and Civil Engineering, University of Canterbury, Christchurch B.L Deam Leicester Steven EQC Lecturer in Civil Engineering, University of Canterbury, Christchurch Sponsor: EQC Research Grant # 03/497

  2. Why use Semi-active system? • Provide a broad range of control - respond to changes in structural behaviour • Provide supplemental damping for all rocking cycles, not only subsequently larger cycles • Provide resistive forces when most benificial to system

  3. Valve and valve controller Test Jig Valve Resetable Device Test Machine Piston Cylinder Device Dynamics Two chambered design: -Utilises each side independently -Resetting can occur at any prescribed point of piston displacement -Portions of motion may dictate both valves to be open

  4. Wr Fd Roof Wr R h b O’ O O Fd Rocking Wall Dynamics

  5. Hybrid Testing Physical system Virtual System Displacement command Valve Control Measured Force and Displacement

  6. Hybrid Testing Procedure • Wall model calculations determine rotation of wall depending on applied forces • Rotation of the wall converted into linear displacement for actuator, signal sent to the dynamic test rig • Valve control determined for current time step • Dynamic test rig supplies displacement to physical semi-active device • Force developed in device returned to virtual system and used in subsequent time-step calculation.

  7. Analysis Procedure • Normalised to uncontrolled case • Presented as: -peak reduction factors, R.F -equivalent viscous damping, ξ • Suite of ground motions used to analyse efficacy of semi-active system to a variety possible events.

  8. Uncontrolled Controlled Rotation about point 0 Rotation about point 0’ Results

  9. Device Force (N) Displacement (m) Device Reponse

  10. Change in Structural Period

  11. a) hybrid result b) analytical result Comparison with Analytical Model

  12. Full Scale Rocking Wall

  13. Summary • Significantly reduce peak rotations of seismically excited rocking wall systems • Provide additional restoring forces to the system when it is most benifical • Model accurately predicts test results allowing scaling to a variety of applications • Results are dependent on ground motion, hence important to examine using a suite of ground motions

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