Structural Engineering and Earthquake Simulation Laboratory

1-g Pile Tests – Brief Plans1-g Pile Tests – Brief Plans

R. Bethapudi, S. Thevanayagam, UB

PI: R. Dobry, co-PI’s: A. Elgamal, S. Thevanayagam, T. Abdoun, M. ZeghalUB-NEES Lab: A. Reinhorn, M. Pitman, J. Hanley, SEESL-StaffTulane: Usama El ShamyStudents & Staff: UB (N. Ecemis, Raghudeep B.) and RPI (J. Ubilla, M. Gonzalez, V. Bennett, C. Medina, Hassan, Inthuorn)

Structural Engineering and Earthquake Simulation Laboratory

Test Plans Test Plans

Single PileSingle Pile High-EI Pile (Test 1A) High-EI Pile (Test 1A) –2Hz, amax=0.3g –2Hz, amax=0.3g Low-EI Pile (Test 1B) Low-EI Pile (Test 1B) – 2Hz, amax=0.3g – 2Hz, amax=0.3g

Group PileGroup Pile High-EI Pile (Test 2A) High-EI Pile (Test 2A) –2Hz, amax=0.3g –2Hz, amax=0.3g Low-EI Pile (Test 2B) Low-EI Pile (Test 2B) – 2Hz, amax=0.3g – 2Hz, amax=0.3g

Structural Engineering and Earthquake Simulation Laboratory

6.2 m

SECTIONAL VIEW

Shaking Frame on Strong Floor

Test 1A: High EI pileTest 1B: Low EI pile

=2 or ? deg.

F#55Sand, Dr~45%

Single Pile (Tests 1A & 1B)Single Pile (Tests 1A & 1B)

Structural Engineering and Earthquake Simulation Laboratory

Instrumentation: Instrumentation: Single PileSingle Pile

Structural Engineering and Earthquake Simulation Laboratory

Instrumentation – Plan ViewInstrumentation – Plan View

MEMS

VideoKrypton

Piezometer

Y-Acc (Ring)X-Acc

Strain Gauges

Pile

Y-Pot.

X-Pot.

4331717

17

6

4

1

66

Chan. Needed: 156

2D2D5D

D

3D

EAST

SOUTH

Structural Engineering and Earthquake Simulation Laboratory

Structural Engineering and Earthquake Simulation Laboratory

Structural Engineering and Earthquake Simulation Laboratory

Group Pile (Tests 2A and 2B)Group Pile (Tests 2A and 2B)

5.0 m

2.75

m

6.2 m

SECTIONAL VIEW

PLAN

Shaking Frame on Strong Floor

Test 2A:High EI Group Pile Test 2B:Low EI Group Pile

=2 or ? deg.

F#55Sand, Dr~45%

3.35

m

5.6 m

Pile Cap

Structural Engineering and Earthquake Simulation Laboratory

Instrumentation: 2x2 GroupInstrumentation: 2x2 Group

Structural Engineering and Earthquake Simulation Laboratory

Pile PropertiesPile Properties

O.D. [cm] THK [cm] I.D. [cm] I [cm4] EI (KN-m2) Area [m2]Sch 40 10 27.305 0.9271 25.4508 6690.264 14049.6 1.7

Pile TypeLow EI Pile

High EI Pile

6.4 m [21 ft] long Grade 50 Steel Hollow Pipe

E = 210 GPa [29000 ksi]

O.D. [cm] THK [cm] I.D. [cm] I [cm4] EI (KN-m2)Sch 40 12 32.385 0.9525 30.5 11626.8 24416.3

Pile Type

Structural Engineering and Earthquake Simulation Laboratory

PILE

Pile - Base Plate ConnectionPile - Base Plate Connection

Structural Engineering and Earthquake Simulation Laboratory

Instrumentation Summary for Single Instrumentation Summary for Single and Group Pilesand Group Piles

Sensors Total Need Available

Strain Gauges 111 66MEMS 96 ?

Piezometers 42 39X-Acc(Ring) 17 25Y-Acc(Ring) 17 25

X-Potentiometers 17 20Y-Potentiometers 14 20

Video 4 4K-270 1 1

Chan. Needed: 218

Sensors Total Need Available

Strain Gauges 66 66

MEMS 96 ?Piezometers 33 20X-Acc(Ring) 17 25Y-Acc(Ring) 17 25

X-Potentiometers 17 20

Y-Potentiometers 6 20Video 4 4K-270 1 1

Chan. Needed: 156

Single PileSingle Pile Group PileGroup Pile

Note: Potentiometer numbers will be increased every ring (24) & video targets will be installed

Structural Engineering and Earthquake Simulation Laboratory

DiscussionDiscussion1. Slope Angle - 2o or other?

2. Ground Motion – Same as SG-1?

3. Soil Density – Same as SG-1?

4. Pile Stiffness - TBA

-0.4

-0.3

-0.2

-0.1

0.0

0.1

0.2

0.3

0.4

0 10 20 30Time (s)

Acc

eler

atio

n (g

)

a1

a2

a3

a4

umax=0.75’’

f=2 Hz

a1=0.01 g (5 sec)

a2=0.05 g (10 sec)

a3=0.15 g (10 sec)

a4=0.3 g (10 sec)

Ground Motion - SG-1

Structural Engineering and Earthquake Simulation Laboratory

Open for Discussion by All Open for Discussion by All ResearchersResearchers