Geoscience Reference
In-Depth Information
The NEES/LHP Outdoor Shake Table is a 7.6m wide by 12.2m long single Degree-of-
Freedom(DOF)systemwiththecapabilityofupgradingto6-DOF.Thespecificationsfor
thefirstphaseofthefacilityareastrokeof
75m,apeakhorizontalvelocityof1.8m/s,
a horizontal force capacity of 6.8MN, an overturning moment capacity of 50MN-m for
a 400 ton specimen, and a vertical payload capacity of 20MN. The testing frequency
rangewillbe0-20Hz.Althoughthistableisnotthelargestofitskindintermsofsizein
the world, the velocity, frequency range, and stroke capabilities make it the largest table
outside Japan and the world's first outdoor shake table. The facility will add a signifi-
cant new dimension and capabilities to existing United States testing facilities with no
overhead space and liftingconstraints.
±
0
.
4.3. JAPAN E-DEFENSE SHAKE TABLE
The E-Defense, one of the largest shaking table facilities in the world (Figure 5.25), was
openedin2005,commemoratingthetenthanniversaryofthe1995Kobeearthquake.The
shaking table facility is located at the Hyogo Earthquake Engineering Research Center
(E-Defense)oftheNationalResearchInstituteforEarthScienceandDisasterPrevention
(NIED).
The E-Defense shaking table platform has a dimension of 15m long and 20m wide. It is
supportedonfourteenverticalhydraulicjacksandconnectedtotenhorizontallyhydraulic
jacks, five each in both NS and EW directions, and can move in three directions. It has a
payloadcapacityof1200tonswithmaximumaccelerations,velocities,anddisplacements
of9m
s
2
,0.7m/s,and0.5m
in the vertical direction. About 900 channels of amplifiers and AD converters can be
mountedundertheshakingtableplatformformonitoringvariousoutputsduringshaking.
s
2
,2m/s,and1minbothhorizontaldirectionsandof15m
/
/
4.3.1. Recent shaking table tests at E-Defense
Large shaking table tests with a soil-pile-structure model were conducted to investigate
the following:
1. Inertialand kinematic effects on pile stressand failure.
2. Earthpressure acting on embedded foundation.
Fig. 5.25. E-Defense Shake Table schematic with planned liquefaction SFSI
experiments ina2Dcircularlaminarcontainer,andawaterfrontpile-supportedstructure
