shake tables derek jacobs & julia johnson. what is a shake table? used to replicate earthquakes...
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![Page 1: Shake Tables Derek Jacobs & Julia Johnson. What is a shake table? Used to replicate earthquakes Can also used for noise & vibration tests Their most basic](https://reader035.vdocuments.mx/reader035/viewer/2022062511/5519b19055034660578b45f7/html5/thumbnails/1.jpg)
Shake Tables
Derek Jacobs & Julia Johnson
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What is a shake table?
• Used to replicate earthquakes• Can also used for noise & vibration
tests• Their most basic form, shake tables
consist of a flat plate that moves by computer control
• Shake tables come in a large variety of sizes and capabilities
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Performance Features
• Shake tables can have many different features – Degrees of freedom– Capacity (weight of structure that can be
supported)– Frequency range– Stroke range– Velocity range
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How do they work?
• Table Hardware– System of pistons & motors under the plate– May or may not be sensors in the table itself
• Control Hardware & Software– System of connections that transfer commands
from a computer to the table– One of many types of software programs
chosen for a given table
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Shake tables from around the world University of California San Diego
• Large high performance shake table
• Enables large scale experiments to be performed– Full scale buildings– Single and multiple
column bridge bents– Life line structures– Nuclear containment casks– Seismic isolation systems
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Shake tables from around the world University of California San Diego
• Properties– Single DOF w/ capability
of upgrading to six DOF– Capacity:
• Horizontal force: 6.8MN• Overturning Moment:
50MN-m• Vertical Payload: 20MN
– Frequency range: 0-20Hz
– Stroke range: ± 0.75m– Velocity range: ±1.8m/s
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Shake tables from around the world Rensselaer Polytechnic Institute
• 2-D shake table• Provides periodic or
random shaking determined by input signal
• Used in conjunction with centrifuge
• Can facilitate the investigation into the response of scale geotechnical or soil structure systems
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Shake tables from around the world Rensselaer Polytechnic Institute
• Properties– 965mm x 660mm– 2 DOF– Capacity: 50 kN– Frequency range: 0-350
Hz– Stroke: 6.35mm– Velocity Range:
±1.1m/s– Centrifugal acceleration
max: 100g
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Shake tables from around the world State University of New York -Buffalo
• Dual-movable tables– Used for real time
testing of structures up to 120’ long and 30’ high
– Tables can be used fully in-phase or totally unrelated
– Can test large variety of scale structures from buildings to road segments
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Shake tables from around the world State University of New York -Buffalo
• Properties– Size: 3.6m x 3.6m– 6 DOF– Capacity:
• Vertical payload: 50 tons each
• Overturning moment: 46ton-meter
– Frequency range: 1-50Hz
– Stroke: ±150m, ±150m, ±75m
– Velocity Max: 1.25m/s, 1.25m/s, 0.5m/s
– Acceleration Max: ±1.15g w/ 20 ton specimen
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Shake tables from around the world Miki City, Japan
• Worlds largest shake table
• Offers a wide variety of testing capabilities:– RC structures– Soil pile-structure– Wooden Structures
• Part of the E-Defense • 5 actuators in each
horizontal axis and 14 in the vertical axis
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Shake tables from around the world Miki City, Japan
• Properties– 20m x 15m– 3 DOF– Capacity:
• Payload: 12 MN• Overturning moment: 150
MN-m– Stroke:
• ±100cm Horiz.• ±50cm Vert.
– Velocity• ±200cm/s Horiz.• ±70cm/s Vert.
– Acceleration• ±900cm/s2 Horiz.• ±1,500cm/s2 Vert.
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Shake tables from around the world University of Nevada Reno
• Biaxial multiple shake table facility
• 3 identical biaxial shake tables
• Used for research on long, specially distributable structural and geotechnical systems
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Shake tables from around the world University of California Berkley
• First of its kind• Properties
– 20ft x 20ft– 3 DOF– Capacity: 100kip– Acceleration Range:
±1.5g– Stroke: 10.5 ft, 8.66
ft
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References
• http://nees.buffalo.edu• http://nees.buffalo.edu• http://nees.unr.edu• http://nees.rpi.edu• http://nees.org• http://www.bosai.go.jp/hyogo/
• Make Your Own!– http://www.exo.net/~donr/activities/Shake_Tab
le.pdf