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Experiment-Based Deployment With Experiment-Based Deployment With the Four Seasons Buildingthe Four Seasons Building
Steve KangSteve Kang
Department of Civil & Environmental EngineeringDepartment of Civil & Environmental Engineering
University of California, Los AngelesUniversity of California, Los Angeles
June 8, 2004June 8, 2004
UCLAUCLA
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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 building’s earthquake responses
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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
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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
12
34
56
7
ABCD
N
MK-15 eccentric shaker
Linear inertial shaker
Eccentric mass shaker
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Shaker Installation
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Strain Gauge Installation
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Secure Rooms