Shake tables
The Center has three biaxial shake tables in operation. Manufactured by MTS, each table measures 14 x 14.6 ft (4.3 x 4.5 m), has a stroke of ±12 in (± 300 mm), and can reach a peak velocity of 40 in/sec (1000 mm/sec) and an acceleration of 1g with a 50 ton payload (445 kN).
All three tables can be constrained to act together as a single large table, or they can be operated individually with independent motions.
We also have a fourth shake table referred as the 6DegreeofFreedom (6DOF) table. The fourth table is a true 6 degrees of freedom system, with three translational and three rotational components. The system, except for the seismic controller, was designed inhouse by Patrick Laplace as a lightweight, highperformance shake table primarily targeted for experiments involving vertical excitation including but not limited to seismic qualification testing.
The table is comprised of a 10ft x 10ft (3m x 3m), 7ton platen and can carry a nominal payload of 50 tons (445 kN) at 1 g acceleration in all axes. The X,Y,Z displacement strokes are±12, ±12, and ±4 in (±305, ±305, and ±105 mm) respectively. The system uses a total of eight MTS actuators.
All tables are run using MTS 469D seismic controllers, which are integrated into the laboratory computer network through ScramNET reflective memory. All tables may be relocated to allow a large variation of experimental configurations. It is possible for all four tables to be operated synchronously or asynchronously.
6DOF shake table specifications
Dimension  U.S.  Metric 

Table size  9.3 ft x 9.3 ft  2.8 m x 2.8 m 
Allowable specimen payload  50 ton  445 kN 
Allowable pitch moment  1000 kipft  1356 kNm 
Allowable yaw moment  400 kipft  542 kNm 
Allowable roll moment  400 kipft  542 kNm 
Force capacity of actuators (x, y and z axes) 


Dynamic displacement(x, y and z axes) 


Static displacement (x, y and z axes) 


Peak velocity (x, y and z axes with bare table) 


Peak acceleration (x, y and z axes @ 50 ton payload) 


Operating frequencies  050 Hz  050 Hz 
Biaxial shake table specifications
Dimension  U.S.  Metric 

Table size  14 ft. x 14.6 ft  4.3m x 4.5 m 
Allowable specimen payload  50 ton  445 kN 
Allowable pitch moment  1000 kipft  1356 kNm 
Allowable yaw moment  400 kipft  542 kNm 
Allowable roll moment  400 kipft  542 kNm 
Force capacity of actuators (x and y axes) 


Dynamic displacement(x and y axes) 


Static displacement (x and y axes) 


Peak velocity (x and y axes with bare table) 


Peak acceleration (x and y axes @ 50 ton payload) 


Operating frequencies  050 Hz  050 Hz 