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

• Yellow-tagged following 1994 EQ
• Abandoned for 10 yrs.
• Scheduled for demolition

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A closer look.
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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

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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

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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 buildings earthquake
  responses

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Instrumentation Plan

• Floor accelerations
• 30 accelerometers
• Rocking motion
• 6 vertical accelerometer
• 24 Strain Gauges 6 columns4 faces
• For interstory drift
• 12 DCDT's 3 bays4stories
• Curvature measurement
• 8 DCDTs
• 70 strain gauges

36 Accelerometer channels 20 DCDT channels 94
Strain Gauge channels
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Field Testing
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Project Challenges

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

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Shaker Transportation
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Shaker locations
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Eccentric mass shaker
MK-15 eccentric shaker
Linear inertial shaker
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Shaker Installation
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Strain Gauge Installation
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Secure Rooms