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Full-Scale Cyclic Lateral Load Testing of Reinforced Concrete Drilled Shaft-Column
Kerop D. JanoyanJonathan P. Stewart
John W. Wallace
Department of Civil EngineeringUniversity of California, Los Angeles
UCLA/Caltrans Shaft Test Project
Shaft/Soil Gapping (1994 Northridge Eq.)
UCLA/Caltrans Shaft Test Project
Response of Shaft/Column to Lateral Loading
UCLA/Caltrans Shaft Test Project
Reinforcement Steel Cage Fabrication
UCLA/Caltrans Shaft Test Project
Soil Pressure Cells• 26 Cells Total
FINALGROUND LINE
ShaftColumnSoil PressureCell (Typ.)
DIRECTIONOF LOADING
UCLA/Caltrans Shaft Test Project
DIRECTIONOF LOADING
DIRECTIONOF LOADING
Gamma Tube
GammaTube
Gamma Tube
GammaTube
InclinometerCasing
Fiber-OpticSensors
Fiber-OpticSensor
(View Obstructedby Tube)
ExtensometersExtensometers
UCLA/Caltrans Shaft Test Project
UCLA/Caltrans Shaft Test Project
-96
-72
-48
-24
0
24
48
72
96
0 10 20 30 40 50
Number of Cycles
La
tera
l Dis
pla
ce
me
nt
(in
)
UCLA/Caltrans Shaft Test Project
UCLA/Caltrans Shaft Test Project
UCLA/Caltrans Shaft Test Project
UCLA/Caltrans Shaft Test Project
DIRECTION OF LOADING
PlasticHingeZone
CrushedConcreteRegion
Ongoing Research
• Evaluation of test results– Data reduction and evaluation– Evaluation of below ground line response– Determination of p-y curves
• FEM studies – extrapolation to other sites– Detailed soil testing conducted
• Bridge system studies– Response of multi-column bridge– Standard and near-fault ground motions
UCLA/Caltrans Shaft Test Project
Deflected Shapefrom Survey and Inclinometer Data
-50
-40
-30
-20
-10
0
10
20
30
40
-100 -80 -60 -40 -20 0 20 40 60 80 100
Deflection (in)
Sh
aft
/Co
lum
n L
eng
th (
ft)
EastSide
WestSide
80 in.cycles
40 in.cycles
9 in.cycles
Approx. Ground Line
UCLA/Caltrans Shaft Test Project
Measured Load-Displacement
-350
-250
-150
-50
50
150
250
350
-100 -80 -60 -40 -20 0 20 40 60 80 100
Deflection (in)
Lo
ad (
kip
s)
9 in.cycles
40 in.cycles
80 in.cycles
