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Experiment-Based Deployment With the Four Seasons Building Steve Kang

UCLA. Experiment-Based Deployment With the Four Seasons Building Steve Kang Department of Civil & Environmental Engineering University of California, Los Angeles June 8, 2004. Four Seasons Building. “Yellow-tagged” following 1994 EQ Abandoned for 10 yrs. Scheduled for demolition.

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Experiment-Based Deployment With the Four Seasons Building Steve Kang

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  1. UCLA Experiment-Based Deployment With the Four Seasons Building Steve Kang Department of Civil & Environmental Engineering University of California, Los Angeles June 8, 2004

  2. Four Seasons Building • “Yellow-tagged” following 1994 EQ • Abandoned for 10 yrs. • Scheduled for demolition

  3. A closer look….

  4. Project Schedule • Project start date – May 2003 • Pre-testing analyses – April 2004 • Building access granted – mid-April 2004 • Mount shakers – May 2004 • Install instrumentation – May 2004 • Perform testing – June/July 2004

  5. Pre-Testing Analyses • Pre-testing numerical Modeling of existing building • Review original drawings of the building • 3-D finite element modeling of existing building • Determine optimal locations for vibration shakers/sensors • System identification (mode shapes, periods, damping) • Site characterization and Preliminary field investigation. • Detailed field investigations of structural damage • SEAOSC manometer survey

  6. Summary of expected work • Field testing with Eccentric mass shaker • Forced vibration tests in N-S, E-W translational vibrations and torsional vibration • Vibration tests before and after the removal of partitions to evaluate the effects of nonstructural elements • Field testing with Linear inertial shaker • Simulations of building response using the LSSS test method • Post-testing Numerical modeling and System identification studies • Evaluate modal properties of building; stiffness, damping • Numerical simulation of the building’s earthquake responses

  7. Instrumentation Plan • Floor accelerations • 30 accelerometers • Rocking motion • 6 vertical accelerometer • 24 Strain Gauges = 6 columns*4 faces • For interstory drift • 12 DCDT's = 3 bays*4stories • Curvature measurement • 8 DCDTs • 70 strain gauges 36 Accelerometer channels 20 DCDT channels 94 Strain Gauge channels

  8. Field Testing

  9. Project Challenges • Security/theft • Transients • No electricity • Broken glass/loose wires • Environmental concerns • Mold • Asbestos • Seismic Safety Standard

  10. Shaker Transportation

  11. 1 2 3 4 5 6 7 A B C D Shaker locations N Eccentric mass shaker MK-15 eccentric shaker Linear inertial shaker

  12. Shaker Installation

  13. Strain Gauge Installation

  14. Secure Rooms

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