The Laboratory is equipped with a state-of-the-art shaking table (designed and constructed by ANCO Engineers), which is capable of shaking soil-structure specimens of up to 2 tons at accelerations of up to 1.6 g on its 1.3 m x 1.3 m table. The shaking table can reproduce any ground motion, from synthetic motions to real earthquake records. The hydraulic actuator is capable of producing a stroke of +/- 75 mm. The seismic motion can be applied to all three directions (x , y, and z). The actuators have a servo-valve controlled by an analog inner-loop control system (displacement based), and a digital outer-loop control system (acceleration feedback based).
|Dimensions :||1.3 m x 1.3 m table with a grid of holes 20 cm x 20 cm (Μ14) in order to fix the specimens on the seismic table|
|Degrees of Freedom :||Three degrees of freedom ( X , Y , Z ).
R 51: x – direction; R 52: x and y directions ; R 53 : all 3 directions.
|Maximum Displacement :||+/- 75 mm (150 mm p-p) dynamic|
|Maximum Velocity :||> 1.2 m/sec|
|Maximum Acceleration :||>1 g at the maximum load
≈ 1.6 g for specimen weight 500 kg
≈ 2.2 g for specimen weight 250 kg
|Maximum Load :||2000 kg|
|Frequency range :||0.5 Hz to 50 Hz|
|Servo Valve :||The Servo-valve has a capacity of ≈ 2 t combined with:
A hydraulic valve GPM two stage Moog servo valve,
Analog Control System :
|Industrial GS 2000 PID controller|
digital Control System :
|Digital System with 3 channels (ANCO) together with a Dell Pentium IV PC
It also includes 8 channels ADC with AA filters and 3 channels with Piezoelectric feedback accelerometers.