structural engineering and earthquake simulation laboratory 1-g pile tests – brief plans 1-g pile...
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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