Earthquake Simulator Laboratory
The central feature of the PEER Earthquake Shaking Table Laboratory is the 20’ x 20’ multidirectional (six degree of freedom) earthquake shaking table. In addition, the laboratory houses a large and a small damper test machine, an expansion joint test machine, and all of the associated electronic control, measurement and data acquisition equipment required to operate the testing machines. The specially designed laboratory building is 40’ high, 60’ wide, and 120’ long and is serviced by a 10-ton bridge crane. An electronic maintenance room, a control room, a conference room and a suite of offices are also located in the building.
Earthquake Simulator (Shaking Table)
The PEER Earthquake Shaking Table, dedicated in 1972, was the first of its kind and at 20’ x 20’; is still the largest multidirectional shaking table in the US. The shaking table is configured to produce three translational components of motion; vertical and two horizontal plus three rotational components; pitch, roll and yaw. These six degrees of freedom can be programmed to reproduce any wave forms within the capacities of force, velocity, displacement, and frequency of the system. The shaking table can subject structures, weighing 100,000 lbs, to horizontal accelerations of 1.5 G. The concrete shaking table is heavily reinforced with both traditional reinforcement and post-tensioning tendons. More.
Large Damper Test Machine
The large damper test machine is designed for the testing of full-size dampers. The test machine is a self-reacting system comprised of a dynamic, servo-hydraulic actuator and a reaction frame. The actuator generates a displacement that develops a compression or tension load in the damper which is attached between the actuator and the reaction frame.
The actuator can deliver 900 kN (200 kips) at 0.38 m/sec (15 in/sec) during dynamic tests. In static loading, the actuator delivers a 1560 kN (346 kips) static force with a peak-to-peak stroke limit of (600 mm) 24 in.
Small Damper Test Machine
The small damper test machine is designed for the testing of small to mid size dampers and friction devices. The test machine is a self equilibrating system that consists of two, dynamic servo-hydraulic actuators and a reaction frame. The actuators generate vertical displacement that develops a compression or tension load in the damper or friction device attached between the top and bottom platens of the test machine.
The system capacity is 445 kN (100 kips) at 0.50 m/sec (20 in/sec) during dynamic tests. In static loading, the actuators have a peak-to-peak stroke limit of 500 mm (20 in).
Expansion Joint Test Machine
The expansion joint test machine consists of two orthogonally placed actuators which are attached to stiff beams and installed on Thompson Profile Rail linear guides with minimal rolling resistance. The expansion joint is bolted to the two loading beams, one transverse, the other longitudinal and can be subjected to uni-axial, bi-axial, static or dynamic loading.
The dynamic, servo-hydraulic actuators both have a 2540 mm (100 in) stroke. Each actuator is fitted with a 200 gpm (756 lpm) servo-valve and achieves a dynamic loading velocity of 1092 mm/sec (43 in/sec) at 67 kN (15 kips). The static load capacity of each actuator is 170 kN (38 kips).