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, |
| Inner-loop Analog Control System : |
Industrial GS 2000 PID controller |
| Outer-loop 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. |
