Full-Scale Cyclic Lateral Load Testing of Reinforced Concrete Drilled Shaft-Column Kerop D. Janoyan Jonathan P. Stewart John W. Wallace Department of Civil Engineering University of California, Los Angeles

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

• 26 Cells Total

Soil Pressure Cells DIRECTION OF LOADING FINAL GROUND LINE Column Shaft Soil Pressure Cell (Typ.) UCLA/Caltrans Shaft Test Project

Fiber-Optic Sensor (View Obstructed by Tube) DIRECTION OF LOADING Gamma Tube Extensometers Gamma Tube Extensometers Fiber-Optic Sensors DIRECTION OF LOADING Gamma Tube Inclinometer Casing Gamma Tube UCLA/Caltrans Shaft Test Project

UCLA/Caltrans Shaft Test Project

96 72 48 24 0 -24 0 -48 -72 -96 10 20 30 40 50 Number of Cycles UCLA/Caltrans Shaft Test Project

UCLA/Caltrans Shaft Test Project

UCLA/Caltrans Shaft Test Project

UCLA/Caltrans Shaft Test Project

DIRECTION OF LOADING Plastic Hinge Zone Crushed Concrete Region UCLA/Caltrans Shaft Test Project

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

West Side Deflected Shape from Survey and Inclinometer Data

40

9 in.

cycles 40 in.

cycles

30 -100

Approx. Ground Line

-80 -60 -40 20 10 -20 0 0 -10 -20 -30 -40 -50

Deflection (in)

20 40 60 80

80 in.

cycles East Side

100

UCLA/Caltrans Shaft Test Project

Measured Load-Displacement

350 250

9 in.

cycles

150

40 in.

cycles 80 in.

cycles

-100 -80 -60 -40 50 -20 -50 0 -150 -250 20 40 60 80 100 -350

Deflection (in) UCLA/Caltrans Shaft Test Project